BCRider
Member
Keep in mind Enfields are still used in military service by the Canadian Rangers and many other Commonwealth areas.
This too is coming to an end. Contracts have been let for replacements due to a lack of parts to service the old Lee Enfields. Not sure when the switch over date will be but it's not long to go if it hasn't been started already.
Getting back to the bullet size for a moment...... The classic sizes are .311 to .312 for jacketed bullets and .313 for cast bullets. Running with a .311 cast may or may not result in your optimum accuracy from that barrel.
Probably the best way to be sure is to slug the bore and base your cast bullet size off the results.