I am looking to build a high velocity varmint whacker. I have had a 220 swift in the past and using that as my base of comparison I'd like to stay at or above that level of performance, except I do not want another Swift.

Looking at staying between 50-85 grain projectiles with loads that will dot the I's and cross the T's.

Some chamberings I am considering: .223 WSSM, .224 TTH, 6mm AI, .243 WSSM

What's your opinion?

"I never thought I'd live to see the day that a U.S. president would raise an army to invade his own country."
Robert E. Lee