electronrider
Member
- Joined
- Jan 29, 2008
- Messages
- 68
I am starting my first loads now, and have been working with dummy cartridges to determine OAL for my AR. I am using Hornaday 68 gr. BTHP out of an AR15 24" barrel, 1 in 9 twist. I am finding that I can't really go over 2.250, that is awfully close to the length of my magazine. They feed ok into my AR, and they seem to be feeding ok through the magazine as well. When I measure my test cartridges, I get a bit of variance in the OAL, but when I measure the bullet, I see where there is a difference in the length of it, so I believe that's where that bit of variance is coming from. So, If I am running cartridges between 2.240 and 2.250, and they feed ok, is this about as good as it gets as far as tweaking the OAL for an AR?