So how many loadings, on average - for 222, 204, or 243 whatever experiences you have to share? That's the question.
My "max load" was a 20.5 of 4198 with a 50gr bullet in the case of the .222 rem. So a "book max", not something unique and extra "ify" that only I had ever tried, and in winter. Tell me how many people out there haven't tried this load before! Come on guys.
And on the primer thing, is a 6 1/2 way different from say a CCI 400 which people also pretty commonly use in 222 rem. ? Your point on "process" though is well taken 1stpitch.
Branden:
Typically, you can expect 6-10 loadings...however, this varies due to how "hot" the loads, how tight/sloppy the chamber is [although the chamber is within the 6-7 thousandths range of SAMMI specs], whether you neck size only and full length re-size on the 4/5th reloading, how old the brass is....etc.
For the .222, the case necks are on the thin side, so sometimes they split before other calibers....
As a rule, I have a max of 1 grain below the manual max, and sometimes at 2 grains under the book max if accuracy and killing power is there anyway...that provides an additional pressure safety margin.
I work up my "maximum" i.e. hunting loads in the hot summer months of OH and thus, they are fine all year around. Consider powders that are NOT temperature sensitive...the relatively new ramshot line is one...XTerminator shoots great in the .222 and .223 (I load for both) Western powders which owns Ramshot and Alliant, have a very comprehensive, and FREE reloading manual with lab tested loads... so call or email them...they are great folks there at Western and will mail it in a day/two of speaking with you.
As to primers, I have stuck with CCIs over the years cause they were always available when I started reloading back in 1983. But, all brands are good.