A one-piece base will cover up a small part of your action port at the top. While it does take a little bit of your "loading" room (not really enough to matter), it won't hinder ejection at all. A two-piece base will give a little more room to load (and weighs a slight bit less). In theory, a one piece base will make the action a bit more sturdy. In reality, you'd never know it if it did help at all. On a one-piece, you also have a better chance of your scope staying on target if you get an base screw (or even two) that works loose. You'd still have three screws (or two) holding the base steady. On a two-piece, one loose screw doesn't leave much strength to the base that is only secured by one screw. But, if you mount your bases right, it shouldn't ever be a problem, anyway. If I was going to use standard rings, I would be more inclined to use a one-piece base (along with bedding said base) in order to have a better chance of the rings aligning properly. Many actions are not straight enough to give proper scope ring alignment just based on the trueness of the top of the action. Lapping the rings would also be advised in order to keep from stressing your scope. If you are willing to use the burris signature rings (the ones with the plastic inserts), ring alignment isn't a problem, regardless of action distortion or base set-up used. With that being said, I use two-piece standard bases on all my hunting rifles, along with signature rings. Don't have any trouble with that set-up. On target rifles, I use one-piece picatinny bases. The reason for that is that I often swap around scopes and like to have more options for mounting positions with the multiple slots depending on what I'm getting into. I use signature zee rings for these rifles.
As for which mounts you need, do you have an action with a flat top at the rear, or is it round on top at the front and rear of action?
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