farmerj wrote: Including a .280 Remington barrel for the 7mm chamberings. Since the .280 is a necked down .30-06. And I have a ton of that brass from shooting the M1. (All once fired.)
A 280 Rem is NOT JUST a necked down 30-06. A 270WIN is a necked down 30-06. The 280Rem looks similar but the
case shoulder is 0.050" further forward to prevent chambering in a 270 or a 30-06.
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Back in 1977 I bought a 7mm Rem Mag as my first choice of a hunting rifle while living in a state that only allowed deer hunting with shotgun deer slugs. That 7mm RM was used for everything else from coyote to elk hunting in other states = it was a good choice. But then I got the BUG and started buying rifles of many different calibers and then reloading each to find the best load for its intended purpose. Choices included 17Rem up thru to the 50BMG. Then I started revolvers. pistols, single-shot target-hunting pistols. Then I started building my own rifles and target pistols. Then a bad divorce stopped it all.
If I had to pick one rifle to shoot all the main hunting animals within the lower 48, I would pull my original 7mmRemMag out of the safe.
I gave my son two Winchester model 70 rifles (both left hand) in 7mmRemMag and 30-06 Springfield. He started shooting the 30-06, then switched to the 7mm. Soon the 30-06 was his "safe queen" due to the accuracy of the 7mmRM. He really likes shooting 1 ragged hole groups at 200 yards. He also reloads for all of his firearms now when not deployed flying KC-135R tankers.
My 2 cents. (but still want to build a 280AI)