As for the trimming. It really depends on the pressure, if you run full house loads you stress and in turn stretch the brass more causing you to trim every reload. But if you keep the pressure down to say, midrange-ish then you can go 2 or more reloads with out trimming.
I run a full house load of 27.0 grains X-terminator under a 40 grain Nosler Ballistic tip with tons of different brass and Wolf small rifle magnum primers. This combo (since all components bought in bulk) is a lot less expensive than buying premium varmint ammo, but do have to trim every loading and only get about 6-7 loads out of one brass.
And the groups outta my Stag Arms are just perfect at 200. Nice little ragged hole with 5 shots