The Lee-Enfield .303 has stopped every species of game on this planet for over a hundread years, their is, as mentioned, a variation on barrel diameters due to the wide variety of manufacturers that made these rifles for the commonwealth. Factor in wear and abuse over the years and one ends up a variety accuracy issues. This is one of those examples where reloading can really make a rifle shine. You'll find that ballistic co-efficient will be the least of you issues a .303 Brit. Back to the gun club question, most members at a gun club are there for one purpose, to participate in an activity they love. Helping out a fellow memeber or new shooter is something most take pride in. Every club has a few members whose ego and pockets can make life annoying, it won't take long to figure out who they are and ignore them.