Thread: Trying something, Eric Cortina method of load development

It's very hard to argue with Eric's results. I watched his video about neck sizing vs full length sizing and thought, alright I'll give it a go. It made a bit of a difference. These are two 3 shot groups shot about a month (possibly longer) apart, from the same rifle ( Howa 1500 308), same
type of projectiles from the same box, same powder from the same bottle, etc.

What I'm getting at is the only difference was I full length sized the brass and the group size halved. I know 3 shots is only indicative and maybe Jupiter was fully aligned with Uranus for the second group on the left, but...I'm converted. I'll be full length sizing for this rifle from now on.

Originally Posted by Rated M for Magnum

It's very hard to argue with Eric's results. I watched his video about neck sizing vs full length sizing and thought, alright I'll give it a go. It made a bit of a difference. These are two 3 shot groups shot about a month (possibly longer) apart, from the same rifle ( Howa 1500 308), same
type of projectiles from the same box, same powder from the same bottle, etc.

What I'm getting at is the only difference was I full length sized the brass and the group size halved. I know 3 shots is only indicative and maybe Jupiter was fully aligned with Uranus for the second group on the left, but...I'm converted. I'll be full length sizing for this rifle from now on. Attachment 150656

If i were examining this i would be thinking the group on the right just had slightly too much pull into the shoulder. Note how your vertical dispersion is almost identical.
Howa 308s are like this with light projectiles flat base. Its hard to shoot em badly at 100m.