r/canadaguns • u/izza123 • 1d ago

Misc Question about 12 G to 45-70 insert

I bought a couple short sub caliber inserts for my coach gun, some rifled and some smooth bore.

One in particular is a 45-70 smooth bore insert with like an inch or less of actual bore. I know these are meant to be safe but has anybody used them before? It’ll be in a 12 gauge coach with a 12” barrel.

My main concern is, is this round going to tumble wildly striking the barrel before it can escape the muzzle?

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u/NeruLight 1d ago

I’ve got a collection of 20 different 12Ga adapters. The only ones I have thus far been too scared to try are: .30 carbine, .444 marlin, 45-70 and .450 bushmaster. The “strongest” ones I’ve used are probably 20 GA, .50AE, .44 mag, 10mm. I highly doubt that 45-70 is going to somehow tumble inside of the barrel. The only concern I have is around getting my ass kicked by recoil out of something like a trailhand 10” lol

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u/izza123 1d ago

The pistol caliber ones seem fine, I got two .380 ones for my coach aswell but I’m just a little nervous to send a 45-70 through it.

There’s like 0 barrel on this insert

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u/NeruLight 1d ago

I only shoot indoors, but in my experience the lighter rounds such as rimfire are the ones most prone to tumbling.