For all intents and purposes, the 22" barrel won't shoot any different than a 24" pipe, except for a slight decrease of about 80 +/- fps velocity as mentioned by ChesterGolf.
Shooter skill or error is far more important than length of barrel, even though I admit that when shopping for a new 30-06, I went for a Remington 700 stainless SPS with 24" barrel and standard Limbsaver Recoil Pad. I believe the 7mm Mag in this model has a 26" barrel.
Remington 700 SPS Stainless
In short, longer is better, but don't let the barrel's length be a major deal breaker.
Good luck and happy hunting!
P.S. Stainless price at Sportsman's Warehouse for all calibers is $469. Blued is $399.
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