I can think of two places off the top of my head running 3 Gun matches and I'm not that informed. Diggle ranges north manchester and shield, maybe also the four islands folk. Have heard rumours of more clubs too.
It's a rifle, what's not to like! I really couldn't give a toss what a rifle looks like. As long as I'm enjoying myself, and sending rounds down the range I couldn't be happier.
Not entirely a revolutionary design; the Enfield EM-2 released the bolt and chambered a round upon inserting a loaded mag.
It did, however, had the good manners to allow you to drop an empty mag only when you had instructed it to...