Yaki, I have a 58 cal Lee REAL mold, its in the garage, I'm pretty sure I have some REAL bullits cast for it. If I can find them I'll send you some to play with.
REAL stands for "Rifling Engraved At Loading" a nifty acronym Lee came up with years ago. The top of the bullit is oversize, I've had to use a small hammer to seat them on 1 rifle, but not most. The bullet tapers top to bottom so the bottom will load no problem. You MUST use pure lead for these...no wheel weights. Most find using a lubed fiber overpowder wad helps with accuracy. My friend's T/C 54 cal shoots cloverleafs at 50 yards using 80gr ffg and the heavy REAL bullet. If I was gonna hunt with a non-musket (barrel with deeper rifling's) I would use the REAL for elk, etc.
But...I've always said this...if you live on the western slope, where Elk are plentiful and its not a long drive and you can go every year then bullet selection isn't a big deal as long as you get close.
IF, like ME, you're 53, live a long way from the western slope, and have Hunted Colorado Elk ONCE, then Bullet selection means more to you...you may not get as many chances to shoot, you may take a shot a local would pass on, the range may be more than you like, but you saved for 3 years to put this hunt together and wanna make it happen.
I've been hunting with Minie's exclusively for the past 3 years, while a friend has used PRB's. We have both killed 2 deer, both happy with our choices. The minie hit a rib going in at 50 yards, and you could put 3 fingers in the exit easy. But if I took it for elk I'd load it hotter.