I have used the round Lee's for years. Used the RCBS at a friends but prefer the older Lee's. I also tried the square Lee's but did not like them as they had added a step in the primer transfer that would let a primer escape if not handled correctly at all times. I have not tried the new triangle ones. My friend got a bench mounted priming tool after He hurt his hand, that worked well, but I still prefer the old round Lee primers.
miles
