Daryl,
In checking up on loads for a friend's 14 ga. 1840s ML double rifle I had assumed at least 3 1/2- 4 drams (96-110 gr.) would be in order. I was informed such guns often used quite light loads. I had a hard time believing this until I came across the Rigby load for a very similar rifle. Guess what? 2 drams (55 gr.). I was amazed!

I'm sorry to hear about your shoulder, and yet surprised you can still shoot the .375 that much - especially on the bench. Shoulder pads are sure a blessing, eh.

Aloha, Ka'imiloa