I've seen a 22, .6mm, 25, 6.5, 30, 303IMP, 35, all on the 303 case and all with blown out "improved" case walls .
I'm sure there have been a few others as well.
Personally , I have shot the 25 and the 6.5, pretty neat rifles.
one in a No.4 and the other in a Nartini.
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