My whippet like lad is getting hammered by his No4 although he won't admit it, but after 100 rds, he's got a nice mark on his shoulder and I don't want that to develop into flinching. Club has got competitions from 100 yds up to 500 yds. Can anyone suggest the sort of loads and bullets I could be looking at for this?

I do reload 303 myself but it's soft loads with cast bullets for my Martini Enfield so I've no idea what is appropriate for FMJ bullets. (And I will of course check any suggested load. but it would be great to have a starting point.)

Will appreciate any recommendations. Thanks in advance.