Re: hand priming tool or automatic priming tool from RCBS?
The vast majority of competition shooters embrace every shortcut in sight.
Just opposite of what the few true competitors do..
The only way to set crush to specific value is to measure it during seating. Primer makers suggest 2thou crush as per design. But local factors change optimum crush setting.
Things like pocket depth, firing pin/spring/drop, action timing, headspace, shoulder angle, extractor fit, temperature, primer brand type & powder/load/cartridge capacity.
Smashing a primer into the seat by feel only brings the probability of reliable 'firing'.
But play with some or any of these factors and just watch what happens to a great load.
Well, that is if you're shooting anything other than a 6PPC or 30br at extreme pressures(the ultimate work-around).