Originally Posted by OP
I do know that the 45lc is one of them and since I have one that shoots the load already was leaning
towards another of the same caliber since I have all the equipment to reload these already.
The 45 Colt -- handloaded as the OP says he is able to do -- is an absolutely superb cartridge for brush-country shooting/ranges as has been outline above. Teamed up with the Marlin which take take Ruger-level loads pulling away it is unbeatable.
a Flat-nosed 340gr/1,240fps projectile at moderate pressures (~25,000psi) is comfortable to shoot and will cleanly kill anything Indiana has to offer, ...and then some