6mmBR

[Al Lu]

Please school me. I have a John Hancock Rifle in 6mmBR in and waiting on scope rings. I have 150 pieces of Lapua BR brass, separated by weights(had nothing better do do?). Forster Full size dies on way, Forster Micrometer seater in house. I used a Sinclair 6mm Mandrel on all brass. What other brass preparations or others steps would you recommend so ammunition are as accurate/consitent as could be?

 

[Dusty Stevens]

Go shoot it if the necks dont need turned

 

[HTSmith]

I'm with Dusty. One would assume that since this is a semi-production rifle it would have a no turn neck--but I advise verifying with the manufacturer. Your mandrel has taken care of the overly tight necks the factory brass tends to come with. I personally have seen no gain from fooling with primer pockets and flash holes (I'm sure some will differ). I do think that a fitted sizing die (like a Harrells) would extend your brass life for sure and maybe give you better accuracy. Just my $.02

 

[Dgd6mm]

I'm curious, how consistent did the brass weigh?

 

[Al Lu]

in Grains
2 pieces Lowest 127.xx's

Averages around 128.10's thru 128.50's

10 pieces Highest 129.86 and around 129.56's

 

[Dgd6mm]

Thanks Al.

Don Dunlap

 

[tmwinds]

Might want to chamfer the mouth inside and out before seating bullets. + 1 on the Harrell's die and they are inexpensive.