On my 45/70 jacketed loads I use a Lee Factory Crimp Die but,on my cast bullets I crimp with my bullet seating die in the crimp groove.On a cast bullet with a groove I see no need to use the crimp die.If you are not careful you can damage a cast bullet with the crimp die.I also think it might be easier on cases to crimp with the seating die.I hope this helps. Good luck Jeff Taylor.
5 Shot, since you ask the question about crimping in a Ruger #1....
Since it's a single shot you have no worries about recoil affecting the bullets in a magazine, you may find you don't need to crimp at all. I shoot the .45/70 in an Encore and don't crimp. I only make sure the case gets straightened.
I do what BrianK does also. Why force a bullet to scrape past a crimp that is not neded. I suppose if you are using heavy charges a crimp might be good so as to hold the bullet in place and give the powder a chance to light up a bit. Good Shooting!!
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