Speer 223 subsonic8/9/2023 ![]() Interesting, when I first started chronoing my blackout 220 subs I thought that I would set my msv3 sensitivity to a high 9 to better pick them up but it turns out that there is plenty mass there for it to pick up. Does varying neck tension have a magnified effect when loading at such low pressures/velocity? If so, I could try some case lube on the bullets when seating, or crimping them in? all cases have been annealed, and prepped the same. This gun is capable of ~1/2” groups with conventional supersonic handloads, so the rifle is not the problem.Ī few thoughts… neck tension. Hornady lead tips, CCI BR-4’s, out of a 1-7, 26” barrel, and gemtek trek. This is with mixed year lake city brass, 55 gr. ![]() This seems too coincidental.Ĥ.0 grains of trailboss is getting me 1075, to about 875. One thing to note, both times I have tried this, the FPS did seem to drop off as I shot, so higher velocity at the beginning of the shot string and lower at the end. That causes a vertical spread of about 8” at 100 yds! Now, I have read enough to know that it is typical for subsonics to not be particularly accurate, and to have high ES/SD, but 200fps seems crazy! I regularly throw charges to the kernel, and they were weighed on both an electronic and beam scale, so I do not think it was the charges. What I’m experiencing is extreme variation in velocities, about 200 FPS across 5 shots. I must say, with the suppressor on, these things are super quiet, quieter than snapping your fingers. I live in somewhat close proximity to other houses, and need to keep things on the hush, hush. 22lr, and I need to do some varmint control around the house. I know that most folks feel it is a waste of time, but I don’t own a. ![]() I’m trying to work up some subsonic loads for my. ![]()
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