I like the big bores...45-70 OR 500 S&W...the bigger the better...you can always mitigate recoil and/or down load a bit...or go to a longer case in both for more hair, but either one in a shorter barrel wouldn't loose you too much as far as velocity is concerned...where you loose is in the energy department...
45-70, 400gr bullet, 22" bbl/1900 fs/~3200 ME - ~2350 ftlbs at 100 yds.
45-70, 400gr bullet, 16" bbl/1826 fs/~2900 ME - ~2100 ftlbs at 100 yds.
400 gr Speer, 0.259 BC...if you use a Barnse X bullet, or ANY spitzer with a BC 0.457 plus or minus a bit, then the energy at 100 yds is increased considerably, ~2700/ 2500 ftlbs at 100 yds
Many times the argument becomes hair splitting, defensive, apples and quavas, or "I'm right and your wrong" and misses the point altogether.
I found over the years that the bigger the bullet the less meat is lost and the quicker the animal goes down...much bigger blood trail and a quicker bleed out. Works for me.
There is a whole passle of 357 cal cartridges...357 Maximum, 357 Herrett, 35 Rem, 356/358 Win you could upgrade to and they have fairly heavy bullets, up to near 300 gr in caste lead and are excellent woods cartridges, that would work great by rechamberting the 357 Mag and being cognizant of the pressures.
Lots of ways to go...always the hardest part for me...making THE decision, then doing it. The rest is just mechanics.
Not to keep the pot stirred....it is the bullet profile that limits the range more than anything else...use a bullet with a high BC and you can increase the effective range buy a considerably amount...of course increasing the velocity also helps. The object is to optimize ALL the parameters you can.
Luck