First of all, round nose bullets. Yes, a light to medium taper or roll crimp is good, mainly to keep bullets from creeping forward from recoil of previous shots.
For semiauto rounds in a revolver, it is best to ream out the square shoulder for the case mouth to seat on. That corner in the chamber catches lead, carbon and other debris and over time, will keep the rounds from fully seating. If you look at the chambers of a rimmed caliber cylinder, you will see a tapered transition from case size down to bullet size. This allows most of the trash to just go out the barrel, rather than getting trapped in a square corner. The rounds then headspace on the rim and moonclip and will easily go all the way in, even when dirty.
None of this matters to the occasional plinker, but if you are shooting matches, it matters a lot. You need the most possible speed and reliability to win a match.
If you have round nose bullets, the best way to load them is to get the muzzle pointing down and drop them from 1/4" to 1/2" above the cylinder. Don't try to put them in the chambers by hand. I have very fast reloads with 6 or 8 of any caliber this way. I shoot 38 Short Colt, 38 Special, 9mm, 38 Super, 40 S&W, 44 Auto Mag, and 45 ACP, all with moon clips .