If you could have a short and long range gun....

[ovenpaa]

6BR would do for both distances.

[IainWR]

ME / MV

The Mil standard for civ use of a gallery range with limited danger area (eg Bisley) is 7000J (4500J without HME procedure) and 1000 m/s (3280 ft/s).

That isn't set in stone - ranges on the big trg areas may have higher limits, and some ranges may be more tightly constrained.

Iain

[CormieAckImp]

Now I was thinking 6BR and 260 REM.

They're pretty similar Mike, not sure the .260 would do an awful lot that the 6BR couldn't. Short range a .223 with a fast twist would be nice up to 400m. After that the world's your oyster! I've always liked the idea of a 6mmBR myself. 6.5x47mm?