RE: 7mm
Well, when folks talk about 7mm this or that, more often than not they're talking about the 7mm Rem Mag. I feel confident in saying that sales of 7mm Rem Mag rifles have dwarfed the sales of rifles chambered for other 7mm cartridges, although lately other cartridges like the 7mm-08 and 7mm WSM have probably eaten into that lead somewhat.
I've owned more rifles chambered for the 7mm Rem Mag than any other. I bought my first one back in the 70's, so I have a bit of experience with it. If someone tells you it's the greatest thing since sliced bread and shoots flatter than a laser beam, don't believe them. It's a great deer cartridge no doubt, but so are a lot of others. It shoots a little flatter than the venerable .30-06, but the difference is barely worth mentioning. So don't get hung up totally on how flat a cartridge shoots.I believe that having an accurate rifle is considerably more important than having a fast, flat shooting cartridge no matter what the distance is. I'd rather have a dead-on nuts accurate 7mm-08 than a7mm Rem Mag that's iffy in terms of accuracy. A fast miss, after all,is still a miss. Of course it ispossible to have the whole package too if that's what you want. That is, a fast cartridge in an accurate rifle.