"target" shooting
I get the impression that the OP is referring more to 100-200 yd practice, as opposed to target/Match shooting. All of the name brand slugs mentioned are well up to the task, but the Noslers are expensive in any flavor, as are most other "game" bullets.
Quite a few years back, I ordered a large quantity of 147 gr. FMJBT "mil-spec" slugs, from Wiedners Reloading. Even now, with the current price of components, these slugs are still more affordable than any game bullet, and I suggest that the accuracy is sufficient for casual practice. I use these slugs in my Garands, a .308 Savage Scout, and for a while, a Savage Hog Rifle, and the accuracy was sufficient in all 3 of those sugls in my rifles, for 100-200 yd practice. A step up from these generic bulk FMJ's may be the 150 gr FMJBT bullets offered by Winchester and Hornady, also available in bulk. I shot the Winchesters for a while, till I found the mil-specs at Wiedner.
I once read where 4064 was referred to as an "old man powder" and I like that comment. I use 4064 widely for multiple calibers. Another favorite in the .30's is Varget. A general rule when switching components ( be it projectiles, primers or brass) is to drop the powder charge ( I believe 5% is recommended) and work your way back up in small increments towards the desired, safe charge and veloecity. "Presure Signs" can be elusive, and a useful tool in working up loads is a chronograph. You see velocity readings higher than expected, you are probably flirting with high pressure.