Originally Posted by spdcrazy
Hmm. Haven't thought of a 7mm. What kind of machining is required to rechambing my 300wm to 7mm?
I would be disinclined to do a setback or rechamber on a factory barrel unless it had really been an exceptional performer.
As such, I'd get a top notch aftermarket barrel with a good brake.
I'd also stick with the 300wm in order to get the most from my existing dies, brass, and supplies. If you don't have good dies or brass, then consider 300WSM or possibly 300 RUM.
Try the Berger 230gr OTM with a .719 BC for long range shooting. I just started with them and they look very promising.
The RUM is more expensive to shoot and more recoil. It sounds as though you would incur very few situations where the extra fps will offset those factors.