The 158 grains sounds like it may expand too fast with rifle velocities. Not sure but I think that load was built for pistols. 180 grain cast sounds like something worth trying.All great answers thanks! I don't reload, at least not yet. So will try some 158 grain JSP I found (PMC & Federal). Also found a few boxes of 180 grain Fed Vital-Shock.
From their web site. https://www.buffalobore.com/index.php?l=product_detail&p=100 Their claim not mine.I dunno where they are getting the energy figures for the Buffalo Bore 180gr ammo saying they are equivalent to a 30-30 rifle
The 170gr 30-30 load developes 1800+ ftlbs of energy at the muzzle and the BB 180gr at 1800fps out of a rifle developes 1300+ ftlbs of energy at the muzzle.