What is the best mount system???

[Jack]

Big Joe, both the Weaver and the Leupold are proven designs that work just fine for most applications.
Fabs has a good point about the Burris rings- the plastic insert is a clever and useful feature.
Dom has a good point about the Leupold QD's too- that quick change feature can come in handy.
Personally, I like Conetrol mounts- very sleek, lots of horizontal adjustment in both front and rear, and they allow you to take scopes on and off very easily, and return them to zero (if ya know how to do it). Unfortunately, not cheap, tho
I guess the point is, there's lotsa good ones, pick what appeals to you.
I will give you one piece of advice: if you're starting your shooting career, and you plan to get several more rifles over the next several years, pick one scope mounting system, and use the same system on all of them. Down the line, that will make scope switching a very easy job. Why? For example, I have a 6-20X scope I use for load work up- it's in Conetrol rings, ready to go. When I wanna get serious about some load work up, I can put that scope on any of my rifles. Makes doing fine target work a lot easier than with the 1-4x scope that might be on a brush gun, for example.