45 acp old rcbs seating die

Just purchased a kimber 1911 in 45acp that i have been loading berrys plated bullets in.I ordered some cast bullets for it tonight and started thinking about this old die set that i got from my dad along time ago that i have been saving knowing someday i would get a 45.I have been taper crimping my berry loads with a lee taper crimp die but have read that not use it on lead bullets. is that true?Looking into my seating die it looks like a roll crimp more than a taper crimp.I know my dad loaded lots with this set back in the day.the seat die does not say taper on it just says seat.next time reload was going to try a crimp and see what i get.wondering if others have seen this thanks GSPMAN

If my memory serves me correctly, I purchased a new set of RCBS 45 ACP dies around 1985, they were of 1984 manufacture and came with a roll crimp seating die. About a year or so later RCBP started marketing a taper crimp die, so I purchased one of those also. I never had any chambering problems from just removing the case flaring with the roll crimp die. But separating seating and crimping did help immensely.

I have found crimping improves accuracy, however you do it.
DHB

Was having trouble with slides not going to battery occasionally with some 45 boolits purchased from a bud last yr. Think I solved the problem. Ran them through a 452 sizer and tightened the crimp a bit. The shell is smooth as a babies butt now. Before I was getting slightly bulged cases.

If you are going to use the roll crimp, put just enough of a crimp on it to remove the flare on the mouth of the case. Most auto loaders headspace on the mouth of the case.

The 45 ACP in a 1911 head-spaces on the mouth of the case, so best to use a taper crimp. Also, I have a 45 ACP revolver that head-spaces on the mouth as well.

Use a roll crimp when head-spacing on the rim of the case. I have heard of people using a roll crimp on 45 ACP for use in a revolver when using the moon clips.

In the 45ACP, 9mm & most any rimless auto pistol round, we just want to remove the flare we made for seating the boolit. We should end up with approx .471/.472 outside diameter on the case mouth for the .45ACP. Please don't roll crimp auto pistol brass. Actually, all we need to do is read our loading manuals for the good news !! enjoy Mike

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Originally Posted by gspman

Just purchased a kimber 1911 in 45acp that i have been loading berrys plated bullets in.I ordered some cast bullets for it tonight and started thinking about this old die set that i got from my dad along time ago that i have been saving knowing someday i would get a 45.I have been taper crimping my berry loads with a lee taper crimp die but have read that not use it on lead bullets. is that true?Looking into my seating die it looks like a roll crimp more than a taper crimp.I know my dad loaded lots with this set back in the day.the seat die does not say taper on it just says seat.next time reload was going to try a crimp and see what i get.wondering if others have seen this thanks GSPMAN

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As stated by Labguy, the old RCBS 45ACP die sets used a roll crimp. The stuff you have been reading about not using a Lee die to crimp your lead (cast/swaged) boolits refers to the Lee factory crimp die that uses a carbide ring in the bottom of the die to prevent the crimp from bugling the brass as it irons out any "oversize" such bulging when withdrawing the crimped round from the die. This is not what the regular steel Lee taper crimp die does and this type die (steel) is what you want.

Thanks for the info guys.yeah i will try just removing the flare and see how goes.Havent got my bullets i ordered yet so still only loading j bullets now. Thanks again GSPMAN