I see nothing wrong with the name as it is, but you could simply add RIFLE to it, ie: Big Bore Rifles.
The "DOUBLE RIFLE" forum, is all inclusive, from .22 rimfire, to 4 bore, as long as it is a double rifle, and the "SINGLE SHOT RIFLE forum are both for a particular type of rifle, regardless of caliber.
The "Big BORE rifles"forum would include any rifle from 400 cal up.
A "Medium Bore Rifles"forum would include any rifle from 9.3,(.366) to .399 cal.
A "Small Bore Rifle" forum, would include any rifle smaller that 9.3 (.366)
I, personally, think all are fine the way they are, but that isn't my call! But, I guess that would be parr for the course, when you're an old BOAR!
-------------------- ..........Mac >>>===(x)===>
DUGABOY1, and MacD37 founding member of DRSS www.doublerifleshooterssociety.com "If I die today, I have had a life well spent, for I've been to see the Elephant, and smelled the smoke of Africa!"