Re: What Think of Three Top-End Single Priming Tools?
Correct primer seating is not about feel or fit or looks.
It's about setting every primer(brand/type) to an exact condition -that your gun shoots best with. You cannot achieve this by feel, nor without regard to temps, pocket depths and striker operation/settings. This takes testing, measurements, and more testing.
Now everyone knows that fully seated primers usually go off. And everyone knows the point blank BR boys just squash em into pockets with no measure of it whatsoever. They go off as well.
But unless you limit to tiny 6PPCs at extreme pressures, you need to understand there are things that can go poorly for you with this approach. Or, just as bad, your primer seating can cause you to waste a bunch of load development efforts, and end up choosing loads that are not actually the best. You could choose a primer that 'seems' best(or better than the others tried) while missing that the performance variance was never about a particular primer at all.
I'm saying you can get the correct type of primer to bring the best out of a load no matter it's brand. As well, you can make good primers seem less than right for your gun.
A lot of it follows the common notions that primers are just a matter of trial & error brand/type swapping, and that abstracts in seating(like feel) are good enough.
I discovered otherwise a hard way, and there have been BR shooters who've found it(hopefully easier than I). Sometimes it's addressed with firing pin mass/spring/protrusion settings, trigger brand/hanger settings/action timing, and all of it ultimately falls(or rises) to consistent primer setting.
The K&M does feel good enough. But anyone using a gauged K&M knows that feel is meaningless to actual setting. It's really analogous to seating bullets by feel(rather than measure).
And THIS is what makes the gauged K&M incomparable to ANY other.