45 Colt questions

[45C]

I seriously doubt the jackets would be ripped off. The barrel has "forcing cone" machined purposely to the leade so the bullet will start to swage to the proper diameter before entering and obturating.

The 1860 is not a strong design, and does not have a backstrap. It's fine for the loads it was designed for, but I believe Kirst used a steel, of similar hardness and avalability to the period the 1860 revolvers were designed, so I'm thinking "wear" issues would be more of a concern.

Jacketed bullets tend to wear leades and rifling, due to increased heat from higher pressures generated during initial obturation.

Not having a top strap doesn't help.

They’re not jackets , more of a cap that’s pushed on over the base of the bullet.
What’s odd is I bought a few hundred of these reloads and there’s only a few of these mixed in with the rest of the reloads

 

[bearhunter]

I have never seen a gas check "ripped off" the base of a bullet, from being fired through a barrel. The pressures behind it, keep it firmly against the base. The cups on those bullets in your pics would be even harder to dislodge.

I have seen bullet jackets from projectiles with "exposed lead bases," which used to be standard offerings in both full metal jacket and lead tipped bullets being left behind in bores, but only because higher pressures forced the internal lead cores through the non bonded jackets.

I don't believe you would suffer a kaboom or any real issues by shooting the few bullets you have with those "cup" style jackets.

IMHO, they aren't "gas checks," they are "half jackets."