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Brian Pfleuger · May 31, 2011, 09:33 PM

They show their barrel length at 6 1/2 inches and max load at 6.2 and 6.5 3N37 for 158gr bullets with velocities over 1000 fps.

http://www.lapua.com/en/products/rel.../relodata/6/28

The velocity would be less of a concern than the erratic results. They likely have a SAAMI minimum chamber and you do not, thus lower velocity.

I doubt that less than 1/8 turn crimp is going to have a dramatic effect. I'm inclined to believe that less flare would make more difference but that's obviously just a guess.

What is your OAL compared to their data? That can also have a large effect.

May 31, 2011, 09:33 PM	#2
Brian Pfleuger Moderator Emeritus Join Date: June 25, 2008 Location: Austin, CO Posts: 19,578	They show their barrel length at 6 1/2 inches and max load at 6.2 and 6.5 3N37 for 158gr bullets with velocities over 1000 fps. http://www.lapua.com/en/products/rel.../relodata/6/28 The velocity would be less of a concern than the erratic results. They likely have a SAAMI minimum chamber and you do not, thus lower velocity. I doubt that less than 1/8 turn crimp is going to have a dramatic effect. I'm inclined to believe that less flare would make more difference but that's obviously just a guess. What is your OAL compared to their data? That can also have a large effect.