303 british>410 Shot GUN?

Way too much chamber there to develop serious pressure I would think .
When I was looking into Chazzel adapters. Many warnings about some using a SB2 reciever with rifle calibers. I had Cooey 840 12ga with a 9mm adapter that caused a 40 thou indentation in the breech. Got alot of pierced primers..

So this video is stupid and wouldn't get me doing it. 410s are hardly strong actions.
 
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