I have a SBE II that shots 3" Hevi #6s & #7s great, but for whatever reason it won't shoot the 3" Mag Blends worth a flip. It does O.K. with 3.5 inch shells, but my 2x surgically repaired shoulder doesn't enjoy them at all.
Jim
I saw your pattern you put up with 338 in the 10" using 3" H-13 #7s...that's why I asked about 3" patterning better than a 3.5"...now,don't get me wrong ....I put 336 in the 10 with the 3.5" 7s,but your pattern is WAAAAAYY more uniform & even compared to mine using 3.5"....that's why I was asking about 3" over 3.5". Oh yea.....not to mention the recoil that is slightly uncomfortable....