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/Additional_Fold_1350 23h ago

A buddy of mine has some 12" inserts he had a machinist make for him years ago at work. Has a 30-30, 308, 30-06, 410, 20ga, and a bunch of pistol calibres. Cost him a case of beer for them all, to bad the old machinist fella past away back in 2021 though or Id be seeing about getting a set made. Aparently he had quite the collection that he built starting in the late 60s. Worked into his 70s as he just liked making things.

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u/NeruLight 20h ago

Wow those first three seem quite exotic, nice, your pal is very lucky to have those!!

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u/Additional_Fold_1350 16h ago

They are sweet, made from chrome moly axle shaft stock, super hard aloy, doesnt rust, and shiny as the day he got them. has a couple rifle cartrige ones for his 10ga goose gun too. Said he had them made as he seemed to always have the biggest mully bucks show up in his decoy spread and curse himself that he didnt have a rifle with him. Shot a couple nice bucks with them at 30-40 yards through the years.

Had them made about 20 years ago. Doesnt have one for 45-70, and the only friend I know with a 45-70 is in BC north of Kamloops so its a bit of a drive to go try his out

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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.