This raises it's head every year or two.
Take a Savage 22HP, which has a .222" diameter bore and .227" diameter lands (give or take 1/1000th on each). Original bullet diameter for this in 1911 was .227"-.228".
But those bullets are kinda hard to find that are short enough to stabilize in a 22HP twist. So, some use the more common .224" bullets.
Will the pressure cause the copper jacket on .224" bullets to fill the .227" lands very quickly when it hits the lands, thus sealing the barrel and preventing gas escape? Or will the gas leak past and start eroding the lands?
It would need to swage the bullet out .003".
Copper is soft and flows easily under pressure, and I think the jacket would quickly fill the lands. Others feel differently.
Thoughts?
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