Range Report / Yes, you tell a gunsmith who has made muzzle brakes that he doesn't know what they do
[Karma fronting]
We need to start spacing our trips to that range up Northwest a bit further apart, but I went up to Pawnee this weekend with my AR-Mutt in .300 AAC configuration, and a few handguns.
I brought the AR-Mutt to do some accuracy testing with it with 110gr bullets, to see if it's possibly more accurate with the supersonics. I have a theory as to why it could be. Almost annoyingly, it produced the best group it's done with handloads. Going back and looking at previous groups, though, it seems like it's not been a huge difference. The best subsonic load was with a 220gr Sierra Matchking, creating a 1.25 MOA group, and the best supersonic load was 1.1 MOA.
My theory as to why the supersonic loads can be more accurate is this: No matter how careful I am, I will not be *pefectly* precise in measuring the powder for a load. My scale is accurate to 0.1 grains. Which means it could be rounding 0.06 to 0.1 and 0.14 to 0.1. 0.08 grains doesn't seem like a huge variation. But, since we're talking about loads of about 11 grains vs loads of about 22 grains, that variation would, by my theory, be much more relevant in the subsonic loads (11gr) than they would in the supersonic loads (22gr). And this isn't even counting the possibility of my scale being a little off from one charge to the next. So, simply due to the difference in powder capacities, a high powder capacity load would be more consistent, and thus more accurate, than a lower powder capacity load.
The handguns all worked flawlessly, other than the .400 Corbon barrel in my XD. I'm pretty much done trying to get it to work. If I have more than five rounds in the magazine, it noses the bullets down against the feed ramp and doesn't feed, and I think the lands are pretty close to the mouth of the case, meaning I may have also been seating the bullets too far out. I don't know why the previous XD and EFK barrel combo ended up working well, but this one just doesn't seem like it's ever going to.
We need to start spacing our trips to that range up Northwest a bit further apart, but I went up to Pawnee this weekend with my AR-Mutt in .300 AAC configuration, and a few handguns.
I brought the AR-Mutt to do some accuracy testing with it with 110gr bullets, to see if it's possibly more accurate with the supersonics. I have a theory as to why it could be. Almost annoyingly, it produced the best group it's done with handloads. Going back and looking at previous groups, though, it seems like it's not been a huge difference. The best subsonic load was with a 220gr Sierra Matchking, creating a 1.25 MOA group, and the best supersonic load was 1.1 MOA.
My theory as to why the supersonic loads can be more accurate is this: No matter how careful I am, I will not be *pefectly* precise in measuring the powder for a load. My scale is accurate to 0.1 grains. Which means it could be rounding 0.06 to 0.1 and 0.14 to 0.1. 0.08 grains doesn't seem like a huge variation. But, since we're talking about loads of about 11 grains vs loads of about 22 grains, that variation would, by my theory, be much more relevant in the subsonic loads (11gr) than they would in the supersonic loads (22gr). And this isn't even counting the possibility of my scale being a little off from one charge to the next. So, simply due to the difference in powder capacities, a high powder capacity load would be more consistent, and thus more accurate, than a lower powder capacity load.
The handguns all worked flawlessly, other than the .400 Corbon barrel in my XD. I'm pretty much done trying to get it to work. If I have more than five rounds in the magazine, it noses the bullets down against the feed ramp and doesn't feed, and I think the lands are pretty close to the mouth of the case, meaning I may have also been seating the bullets too far out. I don't know why the previous XD and EFK barrel combo ended up working well, but this one just doesn't seem like it's ever going to.