11-17-2014, 09:39 PM
Yes, you need to full-length re-size for gas guns as a rule. The shoulder needs to be bumped back enough so that they will actually chamber as well.
What chamber do you have? If it's the compound throat, engagement of the first angle isn't going to spike pressures, since it's only .5 degrees. If you are close to be hard into the 1.5 degree angle of the lands, then you will need to work up from 10% below max loads, using no more than .3gr increments, to find where you are at, with a chronograph at the least. Looking at brass and primers won't tell you much about pressures, until you are way too far.
Do you have the Reloading Handbooks? Your questions and a lot more are covered in them.
What chamber do you have? If it's the compound throat, engagement of the first angle isn't going to spike pressures, since it's only .5 degrees. If you are close to be hard into the 1.5 degree angle of the lands, then you will need to work up from 10% below max loads, using no more than .3gr increments, to find where you are at, with a chronograph at the least. Looking at brass and primers won't tell you much about pressures, until you are way too far.
Do you have the Reloading Handbooks? Your questions and a lot more are covered in them.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com