SMLE III (No. 1 Mk. 3) Lee Enfield

[browningautorifle]

had to use some sandpaper on the insides just to get a round in

That may well be it. The Greek black ones were harsh to use.

I wish there was a good source of pulled 7.62x54r bullets

Try Budget Shooter Supply in Vancouver area... PRVI 303 (.311) 150gr FMJBT 100/Bag