oal of target rounds

[top hat 45]

curious where others measure oal for their target type rounds.

specifically referring to 243 loading 95 gr hpbt sierra or 90 gr swift scirrocos.

the ogive depth is slightly shorter on the swifts and so is the oal of round. so my thought is farther jump to the lands, am i right?

do you set up oal for the ogive measurement and possibly longer oal with the swift over the sierras. will have to check clearance on magazine.

 

[Skip]

Must fit magazine. After that, I find the OAL for the specific bullet. Seat a bullet in the case really long, no powder, no primer. Install in the rifle and close the action slowly. Make sure there is no force marks on the bullet when you remove it, subtract .010" to .015" and that is where I load to.

Hope this helps. Each bullet has a different OAL.

 

[top hat 45]

thats how i did it for my bolt gun and shot 95 gr hpbt.

newgun is an ar 10. playing with other gr weights and profiles

 

[Yeah]

Swift and Sierra are both fond of bearing surface. Sciroccos are good stuff apart from that, although I've shot the S2s only in 0.257".

The above advice to find your lands and load accordingly is what you want to do. On a bolt gun I don't do anything other than into the lands equal to their depth, where the mag allows. On a gas gun I jump just a bit due to the reduction in camming force.

 

[Meister]

Depends on the firearm. Some like a little jump, some don't. I ladder test for proper speed and bullet, then mess with the OAL to fine tune the round. Most custom precision rifles I've shot like no jump.