Bill, I have not used that round as intended, but the books indicate that it is the same as a rimmed H&H .375. I recently bought 20 of those cases and put them in the little Turkish 410 and fired formed them to fit. Today I tested 6 rounds with 20g 4659 and 7/8oz with no pressure signs but pretty good recoil. I haven't patterned it yet, but it cut a lot of leaves of the backyard trees.
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