I've never had the luxury of shooting or owning an accurate Enfield so I'd like to better the odds if possible....................Harold
I'm trying to re-org my thoughts, so bear with me on the poit by point's.
1) Tight headspace for one on the .303 Brit cartridge. That's a big problem.
2) Neck resize if you can to get long life out of the 303 case.
3) If possible, slug the bore. is it .312", .311", .310. God help it if it's .314" as in the older smle's. That should not be the problem with the No.4Mk2 from POF.
4) Get a parker hale Model 5C sight for the No4 action.
5) tighen up the king screw in front of the trigger guard. Tight as possible.
6) The .303 Mk7 ammo used a flat based 174 gr bullet. Well I can't seem to find a good jacketed flat based bullet, so I reload wit the hornady 174gr 303 bullet (.3105" dia) works for me.
S&B makes 303 FMJ cartridges which is good ammo. But you can shoot anything if you want, try out different loads.
BTW surplus ammo, WWI, WWII, etc. can be fun to shoot but as it get older it can be less reliable or accurate. Now always, but often.
I'll add more if I can. I am sure there will be others to contribute too.
The best group I had ever achieved wit the Lee Enfield was 1” moa @ 100 yards. That was with a Faz No4Mk2 1954 Lee Enfield.
Regards
Pete