I have two 204 rifles. One shoots 40gr. the other shoots 50 gr. bergers. I think that the 40 gr. are reasonably accurate (under 10 mph cross wind) to 300-350 yds. The 50's will probably give you another 50-100 yds. Reasonably accurate is 3/4 moa or better. I shot my AR with the fifties in a 600 yd F class match. The results were decent, I shot 156/200. It was pretty windy that day. I have seen 6br's and 6 dasher shot @ 600 and 1000 yds. They are very impressive. You will have to decide how critical the time restraint of ranging a target and shooting versus estimating the range and shooting a flatter projectile. If barrel life is not important, I think a 115 gr. 6mm @ 3100+ fps will be very hard to beat. 243, 243ai, or 6x47L are good candidates. Barrel life will probably be about 1000 rounds. The 6mm br or dasher will get 2500-3000 rounds from what I understand, if not more. If you want a real laser like trajectory, you might consider a 6-06. In any of the 6mm, you will probably be best suited with a 28+" barrel. The 6mm will hold up the best at extended ranges (600-1000). Anyway, my two cents worth of opinion. Remember opinion are like a-holes, everyone has one, and some of them really stink.
admittedly I've never shot either... Just read lots of great reviews and researched ballistics on the br... so take what I have to say with a grain of salt.
from what I know the only thing the 243 wssm and the 6br have in common is the fact they both shoot the 6mm bullet. The wssm is a real race horse but is a terrible barrel burner. The wssm doesn't have good brass available, it is overbore. the br is not overly powered, but it is exceptionally accurate and pretty easy on barrels. I have heard time and time again that the br is an excellent mid range varmint rifle. You burn much more powder w/ the wssm and you will experience greater barrel heat. Basically the BR is a short 308 win necked down to 6mm and the WSSM is a short 300wsm necked down to 6mm. lots of difference. IMHO the wssm would make a somewhat cool long range varmint rifle that you intend to shoot only a few rounds an hour out of and have extra money to spend on barrels. If you want that kind of power go w/ a 6-284 and have great brass available.
I used to re-load but now I "hand-load".
-- Well, at least I try --
Hey Britz. I'v thought about the 6mm br as well but forgot to mention it in my list of calibres. Sweet looking cartrige and i'v read that it performes very well. Just curious though, if anyone can tell me, what the differences are between the 6mm br and the .243wssm. Are there pros and cons enough to pick one over the other?
Thanks again everyone for all the info.
The 6 BR is on the right. The WSSM is way over bore and nobody makes good brass for it. I think it was designed by the Sales Staff rather than shooters. Barrel life with the 6BR is much better, great brass is available and it's been proven in the dog towns and rifle matches. 1000 yard Prairie Dog hits are not uncomon with the BR.