For years there has been a debate about the "best" bear repellent caliber. Many have said "44 mag is the minimum" While others say "10mm is best". Why would 357 mag not be proper if 10mm is satisfactory?
357 Mag would be sufficient in most cases, imo.
My Dad loaded all of his own ammo starting way back in 1966 and 357 Mag was
one of his favorite calibers in the pistol category. He could load them with different powder, bullet configurations and some was very destructive.
He also cast a lot of his own bullets and had the lead and babbitt mixtures down
very well that worked best in certain guns he used them in.
He was very good at the reloading and had a couple manuals, Hornady, RCBS, and another
or two that he went by. He also loved shooting my old Ruger Redhawk which i loaded
for as well. He had an early 1970s model Remington 222 that he loaded for and he had it
down to near perfection. That old rifle was deadly accurate and he killed many, many groundhogs and coyotes some more than 300 yds away on a pretty consistent basis.
He taught both us boys reloading, from the late 60s through the 1970s and neither one of us has ever bought ammo since then. Just all supplies needed to reload and doing the best we could to perfect the loads for the most accuracy and right loads for target shooting or hunting.