Shopdog
posted this
29 April 2023
Not really a flaring op,although it is within the capability of these dies.
It's a two diameter,stepped spud. The minor diameter is the lower,and enters the case first.
It pushes all case issues outward,and sets your interference(neck tension). IME there aren't any set in stone #'s for this. You're gonna have to test what your rig prefers. Generally I go with comparing .002", vs .004".
These numbers are far enough apart that it cuts past most of the associated "noise" in making smaller changes. Rarely do I run much less than .0015.... and never more than .004... a crimp is probably more useful than going full gorilla grip(more than .004).
The upper step is held to bullet diameter,+- a smidge. The goal in this step is to have absolute parallelism with the lower,minor diameter. Prior to final seating,the bullet is hand pushed into this top part.....
The trick is this preseat before heading to the seater die. I've tested,retested,tested again.... presenting with high attention paid to getting the bullet started dead nuts,always results in less loaded cartridge run out. To the point that "checking" run out is a waste of time. Similar in concept to;
If you're casting zen,and consistency is sharp.... weighing bullets is a waste of time. We're nipping these issues BEFORE,they're problems. Hard to put into words. Trash in,trash out if you will. Get the bullet straight before the seating op,don't rely on the seater to fix anything.. it can't.