I do most of my own. We used to have a good gunsmith here in town but he went blind in one eye and has retired as a result.I'm leaning toward the 260. But I have read some about the 6x284. I do not know if that is possible with my action or if that caliber is as good as I have read either. Also Wildrose would you mind telling me who does your gun smithing or who you would recommend. I've used several and not completely liked any of them.
There is one guy I'll trust with mine for things I can't do without a lathe and mill here locally in Breckenridge Texas named Jimmy Mitchell. In fact I'm going to have him install several brakes for me this month on four different rifles.
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Personally if I were going with a 6mm of any sort it would be the 6mm Rem. I don't like wildcats because sooner or later you end up having trouble getting components or reloading equipment, or be off on the trip of a lifetime and unable to get ammo.
The latter is why I own 300wm's. No matter what happens or where I go I can get ammo for that caliber within 24 hrs should I get separated from my own.
The .260 is rapidly becoming as easy to get ammo for.
The 6mm Rem isn't quite as easy, but then I'd never take it off on such a trip anyhow.
The .260 Rem though is pretty much the Toyota Landcruiser of short action calibers. There's really not much of anything other than big bears I'd be afraid to try and take with one.
The 6.5-.284 is a great caliber but on a short action you are so limited on seating depth that if you want a repeater you can't take advantage of the case capacity and heavier bullets and it's performance over the .260 doesn't amount to much anyhow. I'd like to own one but already having .260 and .264wm I really have no need.