Graybeard Outdoors - View Single Post - Rechambering question
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post #2 of (permalink) Old 05-10-2020, 05:17 PM
M134 Troll
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Join Date: Jan 2016
Location: Shiawassee County, MI
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7mmBR is based on 6mm BR which evolved from the .308 x 1.5 Barnes which was based on .308 Winchester. Shoulder diameter for the 7mm BR is .4598" and the shoulder diameter for 7 x 57 is smaller, .430".

Now, the 7mm BR shoulder is going to be less than 1.5" from the case base.....something like 1-1.2" from the base. 7 x 57 case is .473" at base. IF the 7x 57 taper is such that case diameter is greater than .4598" 1-1.2" from the rim then a rechamber might work. I'll mike a 7 x57 case later today.
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