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What thickness shim set did you end up with?
As for accuracy, I found that trimming the brass to a consistent length helped tremendously. Well, to make it easier, in order or impact for my reloads.
#1- brass trim length consistency- not so much actual length, just that all are same length. Which greatly impacted #2.
#2- unifrom crimp. I use a roll crimp and brass length impacts the crimping.
#3- adjusting OAL to chamber.
Oh, and placement of sandbags- found that keeping the support bag under the box mag removed any flexing that was taking place between stock and suppressor tube, even though stock was thoroughly inlet to free float around the suppressor.
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I think I ended up with a .001 and a .002 for a total of .003". Not much but it made a noticeable difference that you could feel when closing the bolt. .004 was too much and closing the bolt was difficult.
#1 I tried trimming the brass but whether new or multiple fired brass my trimmer would only seem to trim a tad off of one side. Seems like it had a bent shaft or something. Using a new Lee trimmer and case gauge. The brass varied in length but the trimmer seemed to think they were all fine for length except about 30% of one side. Gave up on that.
#2 I think you are on to something there. These rifles, or maybe it's the 44 mag cartridge, but they are very velocity dependent due to the (relatively) poor trajectory. Before installing the shims I was averaging about 85 fps deviation in velocity over 5 shots and groups were 5". After the shims SD went down to about 20-25 fps and groups shrank. Oddly, before and after the shims, most groups were scattered horizontally and ALWAYS with a flyer that was way low and left. Still can't figure that out. But the groups shrank after the shims for whatever reason. I'm hand loading and measuring everything carefully on a digital scale as best I can.
#3 I'm not sure how to do that and still crimp on the proper spot. I'm guessing the chamber is way longer than it needs to be on these guns.
And yes the stock is about the flimsiest thing I have ever seen so I pull the bag in pretty close too. I've sanded the shit out of the left side and it's still fairly close to the barrel but I don't think it's making contact. They must vacuum form them around a banana?
Really this gun shoots subsonic 300s well enough to make me happy, its the supersonic rounds (for youth deer season) that seem to be problematic. Surprisingly, for being such a pain in the ass I still really like this gun. It's just such a sturdy, compact, and good handling package I guess? Once the kids graduate out of youth seasons it will probably be relegated to subsonic thumper rounds for medium sized critters and just plain old giggles.