I use a 3.5x10 M3 Leupold on a 308win. It's a fine scope and I don't feel the 10X is a hinderance. This set up regularly turns in low to mid 190 scores at 1000 yards, shooting F class/Bipod.
Today I shot two 6.5x284 natch rifles at 1K. One has a 3.5x15x50NXS mildot and one has a 2.5x10x44 Nikon Tactical. Both were set to maximum magnification. I shot 2 points better with the 10X, and had the same X count with both rifles.
I like the extra magnification. 4-16, 6-20 and 8-24 are all great ranges for competition, but it's not always a good thing. A good 10X scope with excellent glass is a fine match scope as well.
So long as you allow yourself the ability to dial back to at least 10X, you should be fine for range work. If it's to be a dual purpose scope, I find being able to dial back to the 2 to 4 power range VERY desirable.
PS... Guess I should have mensioned I shoot NRA prone, not BR.
[ 03-16-2003: Message edited by: FatBoy... ]