Hornady 9th Edition lists their 170 gr RNFP as the heaviest bullet for the .30-30
However, disregarding feed issues and cannelure location, QuickLOAD tells me this:
.30-30 Win (SAAMI) pmax = 42,000 psi
case is presumed 44.0 gr H2O overflow @ 2.039" trim length
calculated for 22.0" barrel
COL: 2.550" with full Factory Crimp
Bullet: Hornady #3075 RN 180 gr (1.168" length)
BL-C2 starting load: 26.9 gr / 1,872 fps / 31,456 psi / 84.6% fill
BL-C2 MAXIMUM load: 29.9 gr / 2,075 fps / 41,695 psi / 94.0% fill
Sorry, no data file yet for LEVERevolution powder (I only have QuickLOAD v3.8)
(Needless to say) work up your loads in a safe and disciplined manner and above all else, have fun!