I size my Garand brass on a Rock Chucker, prime them by hand... because primer seating is critical on the Garand to avoid slam-fires. Then I assemble them on my ProJector progressive... 47grn IMR4895 and any ~150'ish grn FMJ bullet. BBQ, with my 47grn IMR4895 load, thrown in my Hornady powder drop... even with a .4grn difference, is only 1% variance. Unless you are lining up at Camp Perry (or wherever, these days...) that is not a significant issue, assuming you aren't maxing your data. I load for, and shoot my Garand for fun, I don't think that small a difference in powder charge is going to alter my fun-factorness one bit.