I would go with a 375 H&H. While I think the 9.3x62 is a fine choice--and may build one someday--the 375 has some advantages. First, I think it is legal in more countries for DG. Second, it can be easily loaded down using 235 gr bullets to provide a rolling push recoil. I am just not sure what is available in terms of light .368 bullets. The 235 gr Barnes loaded quickly still does not have the recoil of the 270 and 300 gr bullets in the 375, and is versatile on plains game (at least as far a the experiences from my single trip indicate.) You could make a 10# 375 H&H that would not be overly burdensome and was also managable from a recoil perspective.
You know, thinking about your shoulder, if the screw in the front creates a very specific point of pain, have you ever played around with relieving the front surface of the recoil pad to make a pocket where the recoil pressure would be lessened? Might be worth a try--only cost you the price of a pad.
Ixna on the rakeba.
