Arrow, if your going with a short barrel custom gun I would not go with the magnums. The 7 stw will outshoot the 7 rem by a good bit with the 7 wby in between, but there are better choices in a short barrel. The 280 AI, 7mm JRS and 7mm Gibbs will make much better use of the powder in the short barrel. The JRS and the Gibbs are a little faster than the AI but either will sure do well for you. In a 24" barrel the JRS and Gibbs will equal the 7mm rem mag with less powder and much longer barrel life. With what you are doing I agree with 280AIman. Those 7mm wildcats off the '06 case will reach way out there for deer with cheap brass and not as much powder. I have a bunch of'em.
Predictions are difficult, especially when they involve the future