Sunday,
You're looking at two different power levels here, and two different levels of cost. The 7-30 Waters can be found in a Model 94AE, but the 7mmSTE is going to require you to find a Marlin or Winchester chambered for the .307 or .356 and have the rifle rebarelled. You probably already knew that. The downside to both rounds is the limited availability of suitable bullets. I just took a quick look at Hornady, Speer, and Nosler's websites and didn't see any of the bullets that used to be listed for these cartridges. From what I can see, you'd be limited to cast, or custom swaged, bullets at this time. You could just put one in the barrel and one in the magazine, but that would be a bit of a limiting factor if you like more than two quick shots available. At lockstock.com, they still have the Nosler 120gr FP and the Hornady 130gr FP, the Hornady is listed as "limited availablity". I read that as "discontinued" since it is not on their website. You'd be taking a little bit of a gamble having one, at the most, suitable bullets available. It looks like the ballistics for the 7mm STE would be 2900fps with the 120gr and 2700fps with the 139gr from a 22" barrel. The 7-30 will do about 2700 with the 120 and 2400 with the 140 from a 24" barrel, which is what the factory rifles had. I would want the 140gr bullet in either if larger than medium sized whitetails where the quarry. There is a 7-30 Waters for sale, click HERE to have a look at it. There is some discussion on the Marlin Talk forum about gunsmiths who will build the 7mm STE for you. Here is a link that will provide you with a starting point.
You're looking at two different power levels here, and two different levels of cost. The 7-30 Waters can be found in a Model 94AE, but the 7mmSTE is going to require you to find a Marlin or Winchester chambered for the .307 or .356 and have the rifle rebarelled. You probably already knew that. The downside to both rounds is the limited availability of suitable bullets. I just took a quick look at Hornady, Speer, and Nosler's websites and didn't see any of the bullets that used to be listed for these cartridges. From what I can see, you'd be limited to cast, or custom swaged, bullets at this time. You could just put one in the barrel and one in the magazine, but that would be a bit of a limiting factor if you like more than two quick shots available. At lockstock.com, they still have the Nosler 120gr FP and the Hornady 130gr FP, the Hornady is listed as "limited availablity". I read that as "discontinued" since it is not on their website. You'd be taking a little bit of a gamble having one, at the most, suitable bullets available. It looks like the ballistics for the 7mm STE would be 2900fps with the 120gr and 2700fps with the 139gr from a 22" barrel. The 7-30 will do about 2700 with the 120 and 2400 with the 140 from a 24" barrel, which is what the factory rifles had. I would want the 140gr bullet in either if larger than medium sized whitetails where the quarry. There is a 7-30 Waters for sale, click HERE to have a look at it. There is some discussion on the Marlin Talk forum about gunsmiths who will build the 7mm STE for you. Here is a link that will provide you with a starting point.