6.5BR bushing size estimate

[quillow]

I'm gearing up to load for a new AR upper in 6.5br. I will be using Lapua 6br brass that will be expanded with a Sinclair mandrel. I have a 7br full bushing sizing die for after the necks are opened up. Just curious of what size bushings to get, anyone shoot this round that can give me a general range to go for? Unfortunatelly my brass hasn't arrived yet as well as the bullets. Thanks for any ideas.

 

[gunsandgunsmithing]

No turn chamber? You need to know the loaded round diameter to know for sure. With the new brass I'd say .287-.288. In an AR I'd use at least .003-.004" tension. You probably want .003-.004" neck clearance between the loaded round and the chamber too(min. in an AR repeater)--Mike