For Encore rifle barrels, I use Warne steel Weaver style bases and then use Warne quick detach rings. If you use their bases on your Contender rifle barrels, Encore rifle barrels, Encore muzzleloader barrels and Encore 20 gauge shotgun barrels, you can then move your scope(s) around when you switch barrels. Thus, you only need one or two good scopes and have money to buy even more barrels.