once fired

Two questions: 1) Is there useful information to be had from shooting new brass? Ie, play with powder charge or seating depths for chosen neck tension, powder, primer, bullet? 2) What is your successful method, after selecting a powder charge, for choosing ladder seating depths? Ie, what...

I'm new in this forum so please bear with me... I've got plenty of other 223 brass I can trade... I also have 50 BMG brass and bullets I don't use anymore... And some 30-06 brass I've collected but never used... 40 cal, 44 mag, 45acp, All are once fired... Just looking to buy (or trade for)...

Want to buy 30-378 weatherby Brass , Once Fired . Or new if the price is Reasonable to me.

I have 65 empty once fired Hornady Cases for a 300 PRC. Just resize, prep, and load. asking $125 OBO. on Gun broker once fired Hornady 300 PRC brass is going for over $3.00 a case. if your in the lower 48 I will ship free. Alaska and Hawaii I will have to charge shipping, or anywhere else...