I don't understand the desire to shorten the barrel on a 7mm magnum. To me at least, the 7mm Mag. is a rifle one choses for open country, longer range shooting.
In that sort of hunting a longer (26") barrel isn't going to make much difference in how handy the rifle is when hunting. If any rifle NEEDS more barrel length it is the big magnum rounds that burn a lot of powder and give back a lot of velosity. To trim the barrel on a 7mm Mag. to 22" will basically give you 200-250 fps less velosity and that means it is equivalent to the .280 Rem. Why not just shoot the .280 in the first place and burn less powder??
If your hunting is in thicker terrain where a 4" shorter barrel really is desirable.....shots will likely be shorter and the 7mm Magnum is hardly the first chambering I'd choose. There's no need for the high velosity/flat trajectory that it offers. A .280 or even better .30-06 would be a much better choice at ranges under 250 yards.
