I shoot the same load year after year and have consistent match winning performance in my Garand.
My load is a 168 SMK 47.0 grains IMR 4895 military cases CCI #34, recently shot Tula7.62 mm.
Your first choice of powders should be any of the 4895 series: H4895, AA2495 or IMR 4895. These powders are so close that differences are basically lot to lot.
For your Garand, I recommend
You full length size with a small base die. Use RCBS water soluble case lube, spray on lubes will stick the case in your die.
Set the shoulder back .003”, use cartridge headspace gages to set up your dies. I use Wilson, there are other good brands.
Clean your primer pockets.
Prime all cases by hand verify that the primer is completely below the case. Frankfort Arsenal said they set their primers zero to minus 0.005”.
Never, ever, ever use Federal primers as they are the most slamfiring primer in the market, never use primers that are “more sensitive”. That includes "match" or "benchrest" primers as the cups on these primers are thin on top and the priming compounds tend to be more sensitive.
You want insensitive primers with thick cups. I recommend CCI #34’s and Tula7.62 as both are sold a “military spec”
Don’t crimp, don’t set your bullets to the lands, keep your chamber clean.