Hey
Can anyone give me the reasoning for the bench rest calibers ( 22br 25br 6mmbr 7mmbr ...)
For instance the 7mm08 what possible gain would the 7mm br have over it , other than action size or bolt throw ???

I think they were developed to be more effecient in shorter pistol length barrels. And also under the theory that short fat would be more consistent than long and skinny. If my memory serves me correctly.

Safe shooting
Doug

It is a lot easier to shoot 20+ rounds of 7BR than it is of 708. It doesn’t take as much powder and it is easier on the hands.

The BR line was developed initially for rifles not SP's.
It was Remington's way of competing with the PPC line.
Currently the 6Br and the improved version, the 6mm Dasher are two of the LR darlings in the 600 yard and 1,000 yards BR game.

yes but what makes the 6mm dasher more accurate then the 243? the cases are so similar.
I always thought accuracy had to do with a combination of bullet and velocity not case size .
If I load the 6mm br and the 243 at identical velocity with the same bullet in equal barrels what would the differance be?

i am far from an expert on these cases (don't have either) The 6 BR and the Dasher have sort of been in the zone of low extreme spreads, less powder, easy to maintain accuracy.
the new 6.5x47 Lapua case necked down to 6mm is also doing real well (in between a dasher & the 243).
Case design has a part in accuracy, the 6PPC is legendary in the short range BR world. It seems that short/fat has its place.

Yes and no. It has more to do with using the right weight bullet for the twist. On average, a pistol will loose 300 FPS compared to its long barrel counterpart. Other wise the shorter barrel is not an issue. As far as velocity is concerned, different powders are going to react differently in different barrels. You don’t know what grain/weight the barrel is going to like until you try. In short, in my 22-250, H335 liked slower velocities while 4064 liked higher velocities with the same bullet.

Shorter cases are more accurate, all else equal. The .30-06 used to rule the roost for long range over-the-course shooting, but once the .308 was adopted the longer .30 fell by the wayside. The short case outshot the long one constantly, even when both were fired in the same M1 rifles. The reason was the lower extreme spread, which matters a lot more at 600+ yards than it does at 300.


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