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Some M40 reloading....

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  • Some M40 reloading....

    Starting to produce .308 again.

    I feel that each time I go into production I make some little improvements and get better ammo.

    This time I tweaked my headspace to be within +/-.001 of SAAMI standard. My last batch of ammo was about -.003. Im not neck sizing or going to size to each individual rifle.

    Length to Ogive is a pretty consistent 2.26. I took this number from the average length to ogive for FGMM 168. When loading 168s for the two rifles I intend to use them in Im not going to tailor to the lands (yet).

    The big improvement I think will come from using a 21st Century turning mandrel after the Dillon Rapid Trim/Size die. The Dillon makes the necks too tight and the mandrel die is showing me a consistent .002 tension now. I could notice seating the rounds was a bit more "consistent".

    Starting on the M40 to develop a new load.

    My old load was 42.1 of I 4064 with a 168 SMK or Nosler CC. This rifle likes 175s but Ill seldom shoot it beyond 600 yards and the 168s worked great 300 and in. Besides I got a ton of 168s and the light rifle/shooter will take slightly less of a beating at 168.

    Todays target.

    I was using 42.1 as the middle and going lower and higher. All groups are 3 shots. I screwed up and shot one of my 42.9 rounds into my sighter target Take the middle of the sighter group and move it over to 42.9.

    Going to 42.9 was an afterthought. I only loaded them because I wanted to keep the shell plate full as I was loading the 42.7s. Had a stiffer bolt lift and its not where I think this rifle wants to be.

    Ill be investigating 42.3 a bit more.....

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    Gratuitous rifle shot....

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    Last edited by pmclaine; 07-28-2018, 09:27 PM.
    "...But they would never find anything to beat the old Springfield ...the long sleek streamline, very slim but with potent bulges, all in the just exactly right places to give it that pugnaciously forward-leaning, eager look that marked the Springfield. Beside it, the M1 looked like a fat old man puffing with a lack of training...the two most beautiful things made in America were the ax-handle and the clipper ship? ...they should have added one more thing: The Springfield '03 rifle..."

  • #2
    42.3 looks real good. I am interested to see what a 10 shot group looks like and the velocity.

    Comment


    • #3
      I'm going to shoot same argent in groups of three with the magnetospeed for velocities on all of them.

      My old 42.1 velocity has likely changed because I'm letting the rounds seat out slightly to a 2.26 base to ogive.

      More to follow.
      "...But they would never find anything to beat the old Springfield ...the long sleek streamline, very slim but with potent bulges, all in the just exactly right places to give it that pugnaciously forward-leaning, eager look that marked the Springfield. Beside it, the M1 looked like a fat old man puffing with a lack of training...the two most beautiful things made in America were the ax-handle and the clipper ship? ...they should have added one more thing: The Springfield '03 rifle..."

      Comment


      • #4
        Same loads with a Magnetospeed under the bore.....

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        Data.

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        I dont know how statistically significant three rounds of data represents but Im feeling pretty good about 42.3.




        Im guessing its a low node which for the intended use for that rifle probably wont hurt me too much.
        "...But they would never find anything to beat the old Springfield ...the long sleek streamline, very slim but with potent bulges, all in the just exactly right places to give it that pugnaciously forward-leaning, eager look that marked the Springfield. Beside it, the M1 looked like a fat old man puffing with a lack of training...the two most beautiful things made in America were the ax-handle and the clipper ship? ...they should have added one more thing: The Springfield '03 rifle..."

        Comment


        • #5
          Back at it tonight finishing up a load for my M40. Powder is IMR 4064...

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          A picture with the target removed shows a better story....

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          42.4 has a group of eight and two flyers, the far right one which I called. 42.3 shows a four round group and a 6 round group.



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          Data looks good. for my sighters in the first picture 43.3 and 42.4 landed basically on top of each other. Prior data for 42.5 was decent and that three round group was nicely triangulated. I think 42.4 gets me in the middle of a good spot...

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          Next up the LMT MWS .308.
          Last edited by pmclaine; 09-02-2018, 05:28 AM.
          "...But they would never find anything to beat the old Springfield ...the long sleek streamline, very slim but with potent bulges, all in the just exactly right places to give it that pugnaciously forward-leaning, eager look that marked the Springfield. Beside it, the M1 looked like a fat old man puffing with a lack of training...the two most beautiful things made in America were the ax-handle and the clipper ship? ...they should have added one more thing: The Springfield '03 rifle..."

          Comment


          • deltawiskey
            deltawiskey commented
            Editing a comment
            Dang...I Love this Rifle!!!
            DW

          • pmclaine
            pmclaine commented
            Editing a comment
            Ill give you first shot when it sells, promise.

        • #6
          Looking good!

          Comment


          • #7
            Had the M40 out sunday at 300 yards to check my 42.4 ammo. Using the Leupold repro scope I set my target up with an aiming point above my expected point of impact so I wasnt holding in thin air.....

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            I was kind of surprised that my ammo was running about 50 FPS slower than I expected. Granted temps were about twenty degrees cooler but I thought IMR4064 was temp stable....

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            I was kind of of on my estimation of my hold. I used 1.35 mils as my holdover based on some previous shooting. I would have been better off holding a solid 1.4. Its not a bad result but I think If I go up in FPS the rifle will hold tighter. Ill discount whether the magnetospeed messed with my point of impact - Indian not the bow.
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            Shooting this weekend at 300 with rounds 42.4 through 42.9.

            Ill have the magnetospeed attached to see what gets me about 2650.

            Hope I dont regret that next year when its 90 degrees again.
            "...But they would never find anything to beat the old Springfield ...the long sleek streamline, very slim but with potent bulges, all in the just exactly right places to give it that pugnaciously forward-leaning, eager look that marked the Springfield. Beside it, the M1 looked like a fat old man puffing with a lack of training...the two most beautiful things made in America were the ax-handle and the clipper ship? ...they should have added one more thing: The Springfield '03 rifle..."

            Comment


            • #8
              What puzzles me is the large increase in the SD, ES and the vertical spread in the group. I have to ask, how old is the firing pin spring? I had a M-70 that I tested loads when the temp was in the 50's and then shot a match with the temp in the 30's. I had a hell of a time with the vertical spread. Long story short, I had a worn out firing pin spring.

              Comment


              • pmclaine
                pmclaine commented
                Editing a comment
                FPS is original to the rifle. New bought end of 2014?
                I think I have about 1500 rounds on this rifle.

            • #9
              The FPS dropped big time.

              Same 168SMK, same 1X FGMM brass, same Win LRP, same jug of I4064.

              Granted last time it was 90 odd degrees out.

              Its probably 20-30 degrees cooler but I4064 is supposed to be stable

              I shot some groups today And had to go up to 42.9 before I was approaching 2650 again.

              Im thinking the 42.4 load is my low end node and Ill find the high node up around 43.

              My accurate load is around 2665 FPS.

              42.5 and 42.9 both look good on my target board, just require some right windage.

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              Last edited by pmclaine; 10-08-2018, 05:05 AM.
              "...But they would never find anything to beat the old Springfield ...the long sleek streamline, very slim but with potent bulges, all in the just exactly right places to give it that pugnaciously forward-leaning, eager look that marked the Springfield. Beside it, the M1 looked like a fat old man puffing with a lack of training...the two most beautiful things made in America were the ax-handle and the clipper ship? ...they should have added one more thing: The Springfield '03 rifle..."

              Comment


              • #10
                Originally posted by pmclaine View Post
                I4064 is supposed to be stable
                That's not what I've heard or experienced.

                You can take a Marine out of the Corps, but you can't take the Corps out of a Marine.

                Comment


                • pmclaine
                  pmclaine commented
                  Editing a comment
                  Varget became unicorn horns.

                  I like having powder better than hoping for powder.

                  I bought 16 pounds of IMR before the 2016 election.

                  Im feeling like the next time I need to buy components I may have some options.

                  Varget will run fine in my Garand. I can standardize it for all my .308/30-06 to keep things simple and with the Magnetospeed now finding a load is just a matter of dialing velocity.

                  Probably get a Harrels powder drop or similar to keep those Varget logs from falling all over my bench coming out of the Dillon.

                  See I can grow and accept change.

                • SemperFi
                  SemperFi commented
                  Editing a comment
                  It's weird. Some people say IMR4064 is temperature stable, others say it isn't. All I know from my personal experience is that it isn't. But, it is the tightest shooting, and the temp inconsistency is not unmanageable. Temperature variation is a bunch of what the data book is for.

                  Varget did not group or chrono well though my rifles. Temp stable, maybe, but I was going for tightest groups and best performance, so I dropped the Varget idea. Your results may vary.

                  I (my rifle) liked RL15, but when it became unavailable, I said screw you, too, and decided to stay with an American powder company that was doing all it could to keep us supplied during those lean years. I love IMR4064, and always have. Very fine powder, and probably all I'll ever use for .308 as long as it's available. If you appreciate availability (this goes for everyone reading), stick with our own national powder manufacturers. If you don't support them, we may end up with squat someday soon.
                  Last edited by SemperFi; 10-08-2018, 10:40 AM.

                • Skunk
                  Skunk commented
                  Editing a comment
                  I didn't realize Varget had become hard to get. Anyway, I always found 4064 and Re15 to be sensitive and really dirty in comparison to Varget. Always thought BLC-2 sucked as well.

                  Ive just always had really good luck with the Hodgdon Extreme powders...

              • #11
                I thought it was the reason the mil dropped RL15 for I4064 in M118LR.
                "...But they would never find anything to beat the old Springfield ...the long sleek streamline, very slim but with potent bulges, all in the just exactly right places to give it that pugnaciously forward-leaning, eager look that marked the Springfield. Beside it, the M1 looked like a fat old man puffing with a lack of training...the two most beautiful things made in America were the ax-handle and the clipper ship? ...they should have added one more thing: The Springfield '03 rifle..."

                Comment


                • SemperFi
                  SemperFi commented
                  Editing a comment
                  No powder is completely temperature insensitive. There are degrees of temperature (in)stability. From what I understand, IMR4064 is a little more stable than RL15. Other than that, I can't remember the reason for the change in powders.

              • #12
                I was using Varget with good results in my old 700P. I was running min charge and light bullets (125's I think?) with great results, as I was never shooting long then.

                Anyway, you could certainly work up some Varget (I found it to be consistent shooting- I don't have a chrono or other useful data to fall back on other than target data).

                Looking at the chrono data earlier, are you trickling to the grain on these charges? That's one thing I did (as much of a PITA as it was) and I feel it improved overall consistency. I also used one type of brass, trimmed to SAMI max every firing, and seated bullets at SAMI max every time (which I confirmed is well off the lands in the 700P I had). I did the "old school" trick of balancing the bullet on an empty case, and closing the action on it to have the lands seat the bullet. Then carefully unchamber and measure OAL, which is well above the SAMI max in that rifle's case.

                I tumbled in walnut shells with Nu-Finish added. Primer pockets and flash holes were all uniformed the first time through "the ringer".

                Seated one at a time on the Rockchucker-II. I can't remember which dies I was using- I think I have .308 dies from every manufacturer now...

                Comment


                • #13
                  Ill be sticking with I 4064. SemperFi appealed to my patriotism.

                  Im just surprised by the temp difference made in FPS.

                  I thought it was going to be my easiest reloading workup ever but I need to get back into the 2665 range which Ill likely find just above 43 grains of 4064.

                  Thinking back on it the days I first shot were pretty extreme heat/humidity wise. A strong 95 degrees perhaps plus. I was coming off line to sit in the car and run the AC totally sweat stained.
                  "...But they would never find anything to beat the old Springfield ...the long sleek streamline, very slim but with potent bulges, all in the just exactly right places to give it that pugnaciously forward-leaning, eager look that marked the Springfield. Beside it, the M1 looked like a fat old man puffing with a lack of training...the two most beautiful things made in America were the ax-handle and the clipper ship? ...they should have added one more thing: The Springfield '03 rifle..."

                  Comment

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