![]() ![]() For those interested, 20 clicks upwards from a “normal” 100M zero on a scope with 1/4” increments will get you on paper. and there’s not much info out there - frustrating. The pinch of cotton burns up completely in the bore I'm not sure what filling the case with poly fill would do inside a suppressor, and not sure I'd want to find out.I’ve just lately started dabbling in this area. It is not intended to fill the case, and is a different thing than something like poly fill. I mentioned using a pinch of cotton ball to hold the powder in position - that is literally just a pinch, that is pressed down against the powder to hold it against the back of the case. 225" cast bullets though if you don't cast your own. 4gr of Trailboss sounds like it's just asking for a stuck bullet, regardless what you do for filler.Īgain, you'll have much better results using cast bullets for this too. You aren't worried about pressure limits with this kind of load, so start a bit high and work the powder charge down to get where you want to be. If you start low and try to work up to a decent subsonic load, you're gonna stick bullets in the barrel. Ok, so this one is a good example of the lesson to always work light loads down, not up. Maybe will chime in, he has done these before I think. The 60gr nosler ballistic tip is the heaviest thin jacket I can think of but I doubt its much of an improvement over the 55gr youre using now. The problem with heavy bullets is that they arent made in small frangible jackets like the light varmint bullets are, and if youre concerned about houses in the area I would want something that would fragment instead of skip along like a rock. Thats just conjecture though, Ive never tried to sub something that small. I bet the fluffy tb is getting inconsistent burns pushing that small bullet, crimp or more neck tension and a heavier bullet will help add some resistance to make for a more even burn. ![]() If you have ensured that your weights and sizing is all consistent I would try heavier bullets first and then crimp. So it seems you really are getting the full range. Setting it to normal sensitivity I saw that I was consistently in the 800s with none of the strange spikes. I would get some readings up at 1050 fps or so but then some down in the 800s as well, just like you are. 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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