That's what I'm shooting.
Got some other chokes too for the weatherby.
At 30 yards with a sum toy 562 that gun put up a 249 and 238. It put up 140s at 40. In my other 20 the SSX shoots a little tighter than the sum toy so I'm expecting big numbers when I do shoot it.
Also have a PG 670 tempest. It puts up 90 to 100 40 numbers with fed 7s. Shot Hevi 7s out of it once...pattern is tighter with Nevis than Feds....didn't count numbers though.
Mine is a 28 inch barrel.