Yesterday I tried to load some subsonic 77 grain Sierra Match King bullets using 22ARC. I only found a couple of entries on the WWW neither one was dependable only one claims to have attempted this and one pulled a number out of his rear end but was close. Trail Boss is a good reduced load powder it's bulky and suited for low pressure loads the other is Titegroup. The latter is a low charge type powder that doesn't matter how it is oriented in the case or how full the case fills it goes bang with tiny amounts. It is on the most dangerous powders list to load handgun ammunition with because of the small charges they could easily be doubles if you weren't careful. Trail Boss is so bulky it doesn't come in pound containers only 9 ounces in a container Titegroup is dense. TB looks like little donuts I use a dipper to drop it in the scale and then it can be trickled.
I started with 7 grains of TB the source that guessed said 6 grains for a start load and he was right. I ended up at 5.8 and hit my target speed of 1066 fps which is the speed of sound at 600' elevation about what we are at. The velocities were kind of all over the place typical of Trail boss. With the suppressor on I averaged a bit slower at 1048 for five shots and 1022 for five the second attempt to shoot a group. The two sticky targets on the left side were the Trailboss at fifty yards I shot some other targets and got the scope adjusted finally on the furthest left sticky. Not very accurate at all and the holes indicate some wobble or instability in the bullets they aren't punched clean probably would be really bad at further distances. A different design or weight might be better for 22 caliber I never have tried this before.
Switching to the Titegroup I started a little high at 7 grains when I let it go I knew it was too much, not blow up the gun too much just pretty fast almost 1600 fps. I started down a grain at a time and ended up with 4.5 grains which is obscene looking sitting inside the case. It looks like a little pile of dust this stuff must be nitro that little dab pushes a 77 grain bullet 1078 fps. Hodgdon has subsonic loads for .243 Winchester with this stuff that's a huge case compared to 22 ARC. This shows the efficiency of the ARC family cases it doesn't take much powder to make the pressure to push the bullets faster. Anyway, the suppressor slowed the bullets down some I don't know why I still was jacking with the scope and shot the right sticky got five out of six on it. Same bullets almost the same speed but impacting different something for a physics major to figure out. The bullet holes are just a little raggedy I think that's it for sub sonics for now.
I started with 7 grains of TB the source that guessed said 6 grains for a start load and he was right. I ended up at 5.8 and hit my target speed of 1066 fps which is the speed of sound at 600' elevation about what we are at. The velocities were kind of all over the place typical of Trail boss. With the suppressor on I averaged a bit slower at 1048 for five shots and 1022 for five the second attempt to shoot a group. The two sticky targets on the left side were the Trailboss at fifty yards I shot some other targets and got the scope adjusted finally on the furthest left sticky. Not very accurate at all and the holes indicate some wobble or instability in the bullets they aren't punched clean probably would be really bad at further distances. A different design or weight might be better for 22 caliber I never have tried this before.
Switching to the Titegroup I started a little high at 7 grains when I let it go I knew it was too much, not blow up the gun too much just pretty fast almost 1600 fps. I started down a grain at a time and ended up with 4.5 grains which is obscene looking sitting inside the case. It looks like a little pile of dust this stuff must be nitro that little dab pushes a 77 grain bullet 1078 fps. Hodgdon has subsonic loads for .243 Winchester with this stuff that's a huge case compared to 22 ARC. This shows the efficiency of the ARC family cases it doesn't take much powder to make the pressure to push the bullets faster. Anyway, the suppressor slowed the bullets down some I don't know why I still was jacking with the scope and shot the right sticky got five out of six on it. Same bullets almost the same speed but impacting different something for a physics major to figure out. The bullet holes are just a little raggedy I think that's it for sub sonics for now.
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