Since I shoot mostly single shots I don't worry much about crimping. I do have a 38-55 for my Contender tho that was leaving abit of powder in the bbl. (H4227) I found that giving the case a slight crimp gave a better burn.
I always put a slight crimp on my auto or revlover ammo.

One way to check a crimp is to measure your OAL, take the cartridge in hand, place on bench or other solid surface and try to push the bullet into the case. Usually if you have no crimp you can see the bullet move into the case, otherwise remeasure and see if your OAL has changed slightly.
Or, make up a dummy with no powder and place in your bullet puller, you can usually 'feel' the resistance of a bullet in a tightly crimped case.