11mm Netherlands Beaumont

tiriaq

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Looked it up in Donnelly, apparently Bell brass was made for the calibre.
Any suggestions where cases, dies could be obtained?
 
Most of the usual culprits, Buffalo Arms for dies and cases, M.T. Chambers for bullets, slug bore first as there were 2 diff. cases/bores, the newer chambering uses .458" std. bullets.
 
I don't know where you can buy it, but I made a couple of rounds to try from Starline 50-90 Sharps brass. I trimmed it to 2.100", annealed it and formed a neck with a 243 Win Seating Die. Mine slugs to 0.458".

A 400gr cast bullet over 32.0 grs of H4198 gave me a MV of 1400 fps.

It fireformed on the first firing and thereafter I just neck-sized with the 243 Seater die. Pressures are low enough that it will be many firings before the body needs to be sized.
 
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