I was going to go the wildcat route, but picked up a 357 Maximum in a T-C Encore Mike Blem chambered it. I'am getting just over 2600 FPS with CEB 140 gr. bullets, no problem getting 1 1/2" groups at 200 yards.
Just picked up a 450 Bushmaster, haven't had time do anything with it.
With the 1.8" and 35 caliber straight wall, just not much to improve on whats out there commercially.
I did have a 50 B&M Super Short built on a Winchester 70 WSSM action. What it is WSM brass cut to 1.65" using .500 caliber bullets , its proprietary cartridge of SSK Ind. Reason to get rid of it I had to change to shooting to the left side because of problems with my right eye. With CEB 300 gr. bullet I was getting just over 2300 FPS. I shot a couple bears and deer with it nothing went more than 30 yards, one buck was shot at 185 lazered yards. I picked up a Ruger Hawleye 300 RCM left hand that will be going to SSK Ind. to be made in to a 50 B&M Super Short. They will build a 50 B&M Super Short on any Winchester 70 CRF WSSM or WSM action, or Ruger 77 WSM or RCM action.
http://www.b-mriflesandcartridges.com/50-B-M-Super-Short.html#http://sskindustries.com/wp-content/uploads/2014/02/480_331_csupload_54220996.jpg
