I have competed many times in 900M (1000 yd) F-class matches with a 6BR. The Western Canadian F-Class championships were won this year by a 284 with 180's, but second place (By only one point) went to a 6BR. A good driver makes all the difference. 6BR is easy to make work well and is very forgiving. Its consistently excellent results teach you to be a better long distance shooter.
I have a large hay field and i can shoot to one mile at steel gongs. A Berger 105 Hunting VLD (from a plain 6BR) will reach and hit a 22" steel saw blade 10 times out of ten if the mirage is on your side.
Yup What He Said !!!
I was the one that won the Canadian Western Championship, with my 284 Shehane and the 180s. It was very hard to Shake that little 6Br, but the Driver ( Richard ) was Awesome.
Mattt
Learn to shoot that 6Br first and you will do well, thats what i did

Regards
Scott