The case is lifted when seating within the primer shell holder. Rim thickness affects clearance for lift.if you use a primer seater that has a stop, shouldn't the primers all be seated
the same depth?
If you eliminate the case from lifting, then primer depth should be consistent.The case is lifted when seating within the primer shell holder. Rim thickness affects clearance for lift.
That could wiggle results around.
Simply measure the cups with the anvil removed. I've found those dimensions pretty consistent, so if I want to compare one lot to another, I don't have to measure many.I’m curious as to how you measure primer (cup) height? as the 3-legged anvil makes it impossible for me to measure consistently with calipers.
As far as I know, all priming systems hold cases by their rims.If you eliminate the case from lifting, then primer depth should be consistent.
Yes, it’s an easy modification. F class John describes it well in his YouTube vids on the Lee ACP. I did what he said and I get barely any variance in seating depths.For the Lee ACP, did you simply tap the bottom to accept a threaded bolt?
That's what's great about the Lee Acp...It doesn't use a shell holder, it holds it down from inside the case with a plunger type thing. It goes in through the neck and presses the case down.As far as I know, all priming systems hold cases by their rims.
If the rims are different thickness, then cases will be held in different positions during seating.
To seat to same preload:
The total primer height has to be accounted for.
The rim thickness has to be accounted for.
The pocket depth has to be accounted for.
All at once.
This is not averages or generalizations. You either set same preload or you don't.
Well then you have web thickness variance,, likely worse than rim variance..That's what's great about the Lee Acp...It doesn't use a shell holder, it holds it down from inside the case with a plunger type thing. It goes in through the neck and presses the case down.
Not even close to being worse than rim variances. I use the Lee Acp and my results are very similar to the OP's. My primers are always within .0005 variance.Well then you have web thickness variance,, likely worse than rim variance..
I'm waiting for @orkan to reply........got my popcorn readySo what you are saying that the $675 Primal Rights got spanked by a $190 Lee?
Orkan will not be pleased.