Okay, things are getting interesting now. I have 40 pieces of fire formed brass. I decided I would check it for sensitivity to OAL to ogive instead of dealing to much with powder and what not.

So here is what I loaded up.

6 IMR 4350 at 55g under Nosler BT 165gr loaded to the lands 2.647"
6 IMR 4350 at 55g under Nosler BT 165gr at 2.643"
6 IMR 4350 at 55g under Nosler BT 165gr at 2.629"
4 IMR 4350 at 55g under Nosler BT 165gr at 2.615"

6 IMR 4350 at 53g under Sierra GK 180gr load to the lands 2.635"
6 IMR 4350 at 53g under Sierra GK 180gr at 2.634"
6 IMR 4350 at 53g under Sierra GK 180gr at 2.625"

I didn't shoot them all off but I shot a bunch.

I started with the (6 IMR 4350 at 55g under Nosler BT 165gr loaded to the lands 2.647") these shot into a 0.812" 3 shot group.

Then I shot the (6 IMR 4350 at 55g under Nosler BT 165gr at 2.643") these shot into a 0.782" three shot group

I jumped all the way down to the (4 IMR 4350 at 55g under Nosler BT 165gr at 2.615") these are the shortest bullets. They scored 0.937"

The final bullets I shot where the (6 IMR 4350 at 53g under Sierra GK 180gr load to the lands 2.635") The longest 180gr bullets. I shot a 5 shot group for this one and it scored 1.126".

So far OAL doesn't seem to be that big of a factor. So I'm thinking about loading the cases more full. I'm in the middle of the recommended powder band. I'm thinking go to the 3/4 range in powder then try a couple of different oal lengths.

Tom