"I have a UBERTI 1858 Remington 44 cal. I have bought some sample bullets to try. I have loaded 1 of the 45 cal. R.E.A.L. 200 grain & 1 of the 44 Ruger R O A 220 grain conical in the cyclinder with 30 grain of pyrodex P. I thought I would try these out, but as tight as they went in I'M about scared to shoot them. Has anyone shot a tight bullet such as this?"
-- Dan PTTM
Getting back to your original inquiry. I got off-track and into beeswax. Sorry about that.
I believe your problem is one of using the wrong sized bullet.
The Ruger Old Army has slightly larger chambers than the Italian-made replicas. The Ruger requires a ball of .457 inch, while the imports typically use balls of .451 to .454 inch.
That's why the bullets, intended for the Ruger, are a tight fit in the Uberti Remington 1858.
Lee makes its conical bullet in two diameters, for this reason.
I wouldn't be concerned about shooting the bullets if they go in tight. Given the relatively low pressures of black powder and its substitutes, and the improved metallurgy of today's replicas, you shouldn't be anywhere near an overload.
Pressure is increased in relation to the resistance the bullet offers. Lead bullets don't offer much resistance; lead is pretty malleable. The lubricant in the bullet's grooves will help it go down the bore. You can put a little lubricant over the bullets before firing; it may help as well.
Now, if you'd loaded that revolver with copper jacketed bullets, you'd be in a whole new realm of resistance offered by the bullet.
And lest anyone suddenly perk up: it's not worth the trouble. It's been done for years. Generally, the revolver's chambers have to be opened to .451 or .452 inch, and it takes a lot of pressure to seat the jacketed bullet.
John Lachuk had quite an article about using jacketed bullets in cap and ball revolvers in Handloader's Digest No. 8, copyright 1978.
Though he raved about his results, I didn't see much advantage. And it seems to be that the rammer would have a tendency to push a hollow point's cavity closed.
He used very fine FFFFG powder with some loads. This faster-burning powder, coupled with the far greater resistance of the bullet, certainly created much higher pressures. FFFFG is intended for priming flintlocks, and very small-bore rifles and single shot pistols of .32 caliber or smaller.
Cap and ball revolvers are not so good at withstanding such high pressures, owing to their ignition system. The nipples allow a lot of gas to escape backward when you reach a certain level, blowing off caps and pushing the hammer back to half-cock in some instances.
If this happens, you're WAY over pressure.
Just thought I'd throw in this discouragement. Stick to plain, soft lead projectiles.