Cast bullets Max Speed or Pressure?

[GLOOB]

I'm thinking about acquiring a pistol caliber carbine. I really don't care for shooting revolvers, I have found. But I have a lot of bullets, brass, and loaded ammo. So I was wondering. Say I have a lot of 357 non-GC'd cast reloads with a maximum charge of magnum powder. This shoots fine in my revolvers with minimal fouling.

If I shoot the same loads in a carbine in which the projectile reaches 2000 FPS muzzle velocity, could they foul the barrel due to the higher speed, alone? I figure the lube might run out, and there's bore size to worry about. But assuming everything else is fine, does the increased speed cause fouling?

 

[BigBore45]

that will be hard to do without a gas check. to bad they are already loaded because you could try to add alox over the original lube. only one way to be sure is to try a few with a clean barrel and see the results.

 

[Coffeeguy]

It could, you'll just have to try it and see. Leading comes from a few factors: velocity, bullet versus barrel diameter, bullet hardness, and pressure.

Ideally, the bullet should fit the barrel tightly, so slug your bore and measure your bullets. When fired, the base of the bullet should expand (obturate) slightly which seals it against the propellant gases; gas checks help but aren't mandatory. The bullet should also be soft enough to obturate properly given a certain chamber pressure, but not too soft.

It's very unlikely that the bullet will run out of lube; go ahead and shoot what you've got and see if it works...If it leads, well, you've got what you've got. Do a search for 'powdercoating' on here, and you'll see a good option for your cast bullets which will let you achieve 2000+ FPS easily, with no leading.