Lots of truths.
I have many cappers. Some purchased, some gifted. Some Great, some junk.
40+ years of C&B - I always use a capper. It seats the cap fine for me. I "feel"for a good seat when using the capper, lots of practice. BTW, pressing too hard during seating can result in crushing the priming compound...if crushed, it can squeeze priming around the nipple (leaving no compound between the cup & anvil) - er cap and cone/nipple)... No priming compound in the right place leads to "click", "snap" (no "boom").
How important is my capper...this will illustrate:
Temporarily lost track of one of my three cappers at a recent match. All thee are tethered. One is tied to my vest & in a pocket (my rare "straight" in-line capper). Two Cash Mfg. "side" in-line cappers (carefully adjustedto feed like a charm) are tied together on leather lanyards. Theory on the tied pair is that two are easier spotted than one. Its worked beautifully for years.
Well, One of the knots slipped on the 2-capper lanyard and one capper is missing. Bit of a panic on my part, frantic search.....Miracle - found in the grass 100yds away & 5 minutes later. 15 minutes later...same capper has fallen from my cart. Guess it fell out when pulling my reloading gear.. Backtrack to stage 6, ...5 minutes later - found!!. Shot the last stage, somehow clean & a clean match...and......where is that danged capper. Yes, I'd dropped it somehow. Five minutes later I found it again.
Third time lost I think I told folks I was walking the grounds looking for my medication (I needed some).
All are securely re-tied, security double-knots and a drop of glue to lock them. Someone suggested a retractable lanyard. Thank goodness it wasn't my rare "straight" in-line capper.
Likely would be pulling a "Fred Sanford".
Slim
PS...Don't lose your capper