I don't recommend using .45 Auto or .45 Colt lead bullets in the cap and ball.
For one thing, those you buy cast are usually hard. This increases strain on the rammer.
As has been stated, you can use SWAGED .45 bullets. Lead that is swaged must be very soft or the lead will create fissures under pressure.
So, as far as hardness goes swaged bullets are okay.
However, bullets designed for the .45 metallic cartridges have no stepped-in heel. This helps tremendously when you're trying to seat a bullet straight.
I'm skeptical that a bevel-based bullet would help much when it came to seating the bullet in a cap and ball revolver. I would think the bullet would want to tilt, even a small amount. That's the problem with bullets that don't have an aligning heel. I've never tried a bevel-base bullet.
Another problem is the lubricant typically found on cast bullets intended for cartridge guns. It's likely a lubricant unsuitable for black powder: hard and made from petroleum products.
Swaged bullets have very little lubricant on them.
In both of the above cases, you'll need to augment lubrication by putting an approved lubricant over the ball after seating.
Even with conical bullets made for cap and ball revolvers, accuracy is usually disappointing. I've never found a projectile that beats the soft, lead ball for accuracy and ease of loading.
