I read a article recently concerning 8mm mausers being converted to .4mm rimfire. I'm not interested in a conversion but it seems like a slick little backyard round. Nice and quiet and there are sources for ammo.
Has anyone heard of such a beast and if so any recommendations??
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Nothing that I have ever heard of. You can get conversion for a AR-15 to convert it to a 22lr.
converting an 8mm to a 4mm would need a barrel sleave with a chamber built into it. Not unlike some O/U shotguns. Weatherby used to make the Athena in a 12, 16, 20, 28, 410 You got the gun in 12 ga then you got the rest as barrel inserts.
Location: Third bunker on the right,Central Virginia
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The 4mm I have seen is a subcaliber training round- and it does indeed use a sleeve thru the barrel. Have seen them for Luger pistols and 8mm rifles. The Brits had a subcaliber for (IIRC) the Martini Henry that fired a a tiny little bottleneck- want to say Morris.
The 4mms I have appear to be rimfire, but are actually inside primed centerfire (confirmed by xray) Not aware of anyone doing a commercial version- but if you have a friend in to tool and die business, I'll bet you could make an insert that uses .177 pellets, and a #11 percussion cap (no powder)
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