bayrunner
Yours might be a hard find since you are not reloading yet and looking for factory ammo.
The Max load for even Cor-bon "that I could find" was only a...
200gr@1,100 and was still listed as a +P!
(Please research this as It was the best that I could find)
This protects them from liability isssues as only Ruger, FA, Colt anaconda, Dan wesson, or T/C
are rated for the loads that you really need in the .45 Colt
You might get lucky at another gunshow as a 250gr jacketed @ 1,300fps are not too uncommon
but you can be sure that they are marked Ruger Only.
I have never seen a black bear let alone shoot one. Might be ok but as PaulS pointed out, the above
loads could be considered as minium.
Plan "B" would be to have someone load some to Lloyds spec's for you if possible.