I have used those two powders very extensively in a variety of both .30-06 and .308 chambered rifles. I currently have four '.06 and two .308 rifles since I sold several rifles this past year; I am now using H-4350 in the .06s and RE-15 in my .308s with excellent results. This is because these powders are less temperature sensitive than some of the others mentioned.
My P-64 FWT will consistently shoot .5" at 100M with IMR-4350-57grs., CCI 250s, Fed. nickle brass and gives 2760 av. mv. My Browning Safari Grade does only .75" with this load as does my Brno-ZG-47 with the longer barrel, bnoth in untouched factory stocks. My original Mannlicher-Schoenauer does an easy half-inch with 2725 out of it's 20" tube.....what more can you ask for and these are all 180 NPs, my choice as the "best" bullet in the '.06.
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