Re: Whats the "Hottest" 30 caliber?
1. How far do you want to shoot?
2. What bullet weight do you plan on shooting?
There are many good 30 Cals floating around that will give you extreme velocity, if that's what your after.
Any improved 300 Weatherbys will work and win often at Williamsport. The 300 RUM and 300 RUM IMP (Tomahawk) will work well, the fastest is probably the 30/416 Rigby IMP with 36" barrels. The 30/378 is a hot one to and second to the 30/416 IMP.
Anything smaller, such as a 308 Win. will not be as effecient at extreme range if you want to reach way out there and touch something.
you have to decide which weight bullet you want to shoot and what range you want to reach out to and how large the game is going to be you want to Longrange hunt?