I use the Speer 0.308" 170 grain flat point over 32 grains WW748 (no chrono) from a 1976-mfg Marlin 336A 30-30 (24" bbl, micro-groove) . Groups about 1.25" at 100 yards. It has a good ballistic coefficient of 0.304. Probably only the Hornady 160 grain gummy tip has a higher BC for 30-30 loading.
Speer makes a .308" 150 grain flat point bullet too.
yeah, I am partial to the 150 FN Speer.... it does great in a 30/30...
and in an 06 right at 2700 to 2800 it will really smack 'em down...