Perhaps magnum primers would help with a complete burn, or perhaps a cleaner burning powder is needed. Perhaps the group may have been tighter if I hadn't had to unscrew the suppressor and boresnake between rounds 4 and 5. Not that big a deal to me, If I go out hunting with a clean bore, I'll be able to do what I need to do. Looks like I need to boresnake every ten rounds or so to prevent this, particularly when using the suppressor. A couple pieces of the unburned powder was enough to keep the a round from chambering properly. Earlier, I had noticed granules of unburned powder on the tarp where I lay, adjacent to the ejection port. 223 I've been loading for up until now.Ī fresh set with 10 grains, and more attention to detail when loading worked pretty well, though I did have a Failure to Chamber in the middle of the set. The loads sounded pretty quiet anyway, at least compared to the. I shot without my suppressor in the event of a heinously unstable load, and I'm not screwing it back on until I've got a load nailed down. I'm going to load up some more, using 5 round samples now that I'm in the ballpark, probably in one grain intervals down to 9.5.ġ0.5 grains filled the case up pretty good, a little noise when a loaded round is shaken, but not much. Interestingly, the POI moved left to right about a half inch with each decrease in powder charge weight. (or possibly, but not probably, somewhere way low, left, or right.) Of the 10.5 grain rounds, only one was on the paper, so I cannot accurately estimate the group size other than that two rounds impacted more than one inch higher than the first. I wish I knew, because it's the difference between a 1 MOA group and a 4 MOA group. Either that or it went right through a previous round's hole, though it doesn't look like it to me. The 10.3 grain loads had a flyer that wasn't on the paper. I do not have a chronometer, so, I dunno the fps. None of my loads made a supersonic crack, and all fed, fired, ejected, and locked back on an empty PMag. Not too bad, but room for improvement, as the Hornady Factory 208 amax subsonic ammo I've run through this rifle pretty much went all in the same hole. Looks like the 10 grain loads would fit in a one inch square, so 2 MOA-ish. All had a POI about three inches higher than the Lehigh Defense 174 grain CF ammo my rifle is zeroed for. The best of the three was 10 grains of Accurate 5744. Vandy58 wrote:How did the loads do? I just recently purchased two pounds of. I'd like to try them out this afternoon, but thought I'd post a "somebody please tell me if I'm being an idiot" thread before I do so. I tried using the ".25" diameter at the magazine rib" technique, but it seems like that would be seated too deep in this instance.Ī dummy round chambered fine, and the rounds feed from the magazine ok, though they are pushed to center a bit by the rib in the magazine. I could not locate data for the overall length for this projectile, so chose a length in-between the numbers listed for 178g and 210g SMK. R-P 300 aac blackout brass, full length resized in RCBS short base die set.Īccurate 5744 powder: 10.5 / 10.3 / 10 grains If anyone thinks these loads are dangerous, please let me know. After searching for load data with this combination with limited success, I've loaded up a few rounds to test in hopes of finding a combination that will work well.
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