Short explanation: my younger brother suffered a whiplash injury bad enough he was designated 100% disabled for work and sent into early retirement. Amongst the other stuff, his specialist told him his days of shooting his centerfire rifles are over. Even the hand shock from shooting his recurves aggravates the injury, but he built himself a 45 lb long bow for hunting and finds that tolerable. His rimfire rifles he can still shoot with no problems.
So... one of his rifles is a No. 4 Mk1 Lee Enfield I gave him a few decades ago. He's heading over here in a few days, and I want to put together a REALLY light load that he can try and see if he can shoot it without irritation. Something below "The Load" levels of velocity and resulting recoil. I'm hoping that something with a velocity of about 700 - 800 fps with either one of my 175/185 grain moulds will be something that doesn't aggravate his neck injury. At least that would allow him to shoot targets/gophers, etc out to hopefully 50 yards at least.
I'm thinking/guessing of starting with 5 grains of Bullseye, W231, Clays, 700-X, Red Dot, Unique, C-300 (some of what I have on hand) to see how that goes and what the chronograph tells me. I'll be checking the bore after every shot for a bit to ensure I haven't stuck a bullet in the bore before the next round goes in the chamber.
Before I start assembling loads... anybody out there who's already done something similar in .303 British with similar weights of cast bullets? How did it go and what kind of velocities and accuracy did you get?