Just a thought, rimmed cartridges ala. 30-30 are always a better choice in a Contender. .35 Remington barrels have a tendency to have misfires for some reason. 6.5 JDJ based on the .225 Winchester is a marvel in a contender package if you reload. The 7-30 Waters is your Huckleberry if you are stuck with factory ammunition.

Experience is what you get, when you don't get what you want!