This may be a noob issue, but, I got a deal on some Berry's plated bullets in 230 gr 45 acp. Was setting up my progressive RCBS last night and am having difficulty with the crimp. Tried two ways, seat and crimp with the RCBS die, then seat and crimp separately with two different dies.

When crimping all other cartridges ( including 9mm) I set the taper so it is just visible, and will securely hold the bullet. I pull a finished cartridge out of the press, and attepmt to "push" in the bullet up against my bench and double check the overall length to make sure it didn't move.

Having trouble with the Berry's plated. What looks like a normal crimp will not keep the bullet from being pushed back into the casing without really crimping it to the point of mashing the case.

Bullets pulled show a definite line ( and subsequent "sizing") from the crimp, but I am not sure what would be adequate.

Anyone have experience or tips when loading these bullets? My "deal" may not be much of a deal after all.

I've had Berry's show up slightly undersized at times. What brass are you using? I find RP too thin & won;t give a good bullet pull w/ a taper crimp. Try WW or mil spec brass.

do not use a roll crimp on plated bullets, the case mouth will cut through the thin plating. use only a taper crimp, and as little of that as you can

Thanks fellas, bullets are .450. guess a thou undersize. Am using a taper crimp, but the crimp heavy enough to hold the ullet securely looks to be an 1/8 inch wide, instead of being barely noticable.

Would a lyman factory crimp die possibly be a better solution than the RCBS?

I use a Lee Factory Crimp Die on 45 Colt and 357
plated bullets. Works great!
Pete