What is more accurate in 300 meters? 6BR or 243 Winchester?

Not only is the 6 BR generally more accurate it produces ballistics all out of proportion to it's size. In 8in twist barrel it is performing well at 1000 yd. Velocities at the muzzle of a 27 inch barrel are running around 2800 with 107s. For a target rifle I wouldn't even consider a 243 over a BR. Regards, Bill

I'd go with the BR, no doubt at all.

-- Mats

If you are shooting heavy, VLD class bullets in the 6BR, then by all means the 6BR has a consistent accuracy advantage over the .243. That isn't to say that the .243 isn't accurate, it's just that the 6BR will be consistently better. This assumes though that your twist on the 6BR is fast enough to handle the heavier bullets? If you have a slow twist (1/14) benchrest setup for the 6BR then the .243 is likely going to beat it at longer ranges beyond 300 yards due to it's being able to use bullets that have a much greater BC compared to the typical, 62 grain bullets used for 100 yard benchrest competition.

The 6BR is indeed very good for it's size. For example, with light bullets in the 55 gr. area it can hit 3800 fps. For heavy bullets like the 107 gr. Sierra I get 2900 fps in my 27" custom 1/8 twist rifle. If one is building a custom rifle, this level of both velocity and accuracy would cause me to favor the 6BR over either the .243 or .22-250. Don't let it's diminuitive size fool you, it is hyper-efficient.

Regards,
re5513

Many thanks for Leeper, Mats and re5513.
Biga

Hiu
Nobody mentioned with which kind of pressure the balistic figures of 6 mm Br are acheived?
i'll be gratefull to know more about the working pressure of this caliber.
Danny

If you want even more performance take a look at the 6BR Dasher....the shoulder pushed forward a bit with a steeper shoulder.

Danny Pay,
I would say that the loads in the 6BR are like most benchresters loads, right near the top. I don't know what pressures run at but can say that nobody wants to run pressures that expand primer pockets and ruins brass. I expect 50 rounds of brass to easily wear out the barrel so life has to be decent.
While the dasher maybe fine I have gone through the pain in the neck of forming BR brass before this was available formed and I figure to take advantage of the fact that I can use brass as it comes (after neck turning of course). Regards, Bill.

This may be an ignorant question, but all my books are packed up right now, but can the 243 be rechambered to a 6BR easily?

I seem to remember that it is shorter, but this damn senile stuff gets me into trouble sometimes so figured I'd ask!