I believe that shooting service rifle you do not need to overthink the accuracy thing. It is not like taking your 223Rem bolt gun with its 1" bull barrel to a benchrest match.
I would agree with the above in that once fired LCC (or others) will be good. Just stick will all the same headstamp including year.
I would also stick with CCI 400 or 450 depending on your choice of powder. I use AII 450's no matter the bullet or powder used.
I shot several different disciplines but never service rifle. But I have a buddy that was a champ at it. I will give him a call and see what he has to add. --- SAWMAN