I have used both with success. For blamo ammo 2520 is good and accurate enough, just remember a basic/stock M1 is 3MOA or less depending on how it's stocked/setup. IMR4064 is a great 06/M1 powder also & I have loaded many rds using 150FMJ/155Nosler Match/168 Sierra/Nosler etc with great results. I pretty much use Winchester LRP in my M1s & even my 30/06 Precision rifle and I have had good results & they shoot on par with CCI BR/Federal Gold NM & CCI 34 Military primers out of my rifles, YMMV. If you're switching up ammo and loading many different bullets & powders then the adjustable gas plug is a viable addition, I'm pretty consistent in bullet weights and powder I use so I don't mess with them myself. Powders are tough to find now a day so use what ya got, I guess. I ended up scoring a fair amount of H4895 & I love it, I think it's the closest if not the original canister style/type powder that the Military used in 06 loads back in the day. IMR4895 is a good choice also and works great in 308. Let us know how ya make out & what ya end up coming up with.
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