Hey Guys,
Well here as some of my mock up rounds I used these for function testing in my M1A cartridges are 2.600-2.605 in overall length as I mentioned in my previous post they weigh in at 160-161. I loaded them up in a mag and cycled them through the weapon to confirm they are dimensionally sound I was a little concerned that with LC brass my loaded rounds are .340 at the neck with the .311 size bullet which is correct for brass thats .0145 thick, I also ran them though my taper crimp die just to make sure the necks were uniform and make sure there was no bell left in brass from expanding the neck with my Lyman M die. I verified that the bullets are still snug in the neck no set back at all after chambering from a magizne(honestly they appear snugger than my 168SMK when I seat them, I think the lead my actually grab a bit tighter, than the copper jacketed 168SMKs. Im going to load up about 12 grains of Green Dot and fire them at roughly 1500fps and cycle the bolt manually just to confirm everything is good, want to make sure I have no leading at the lower velocity.
If everything checks out, I'll move up to the a real load of IMR 4895 at 28 grains and see if she cycles, otherwise I'll go to 29 grain. I really hope to I dont have to go to 30grs to get it to cycle because I'll be likely at nearly 1900 fps at that point. Oh yeah I plan to use no filler at this point. Im only going to be shooting at 150 yrds.
any pointers would be helpful...I would like know what charge weight of IMR4895 you guys are using for lead rounds??? to get proper cycling(currently I need stick with IMR 4895)
I laid them on the scanner to scan thats why the look a little funny.
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