If you are just looking for accuracy , not max velocity , the powder burn rate does not make that much difference and has nothing to do with accuracy . In some carbines my best load is with I-4350 . You would want to use a bullet that shoots best in YOUR gun . I have very accurate loads for M-94's using a 100 fp , 107 smk , and also to standard 140 range bt or fb bullets . The 160 round nose is the worst [ but not that bad ] . No US type bullet will shoot to the sights , [the military bullets are made different ] , plus after 100 years of wood settling the zero change really change . The throat length really does not matter , I have load that are way of the lands and they shoot fine .