Just out of interest who else Dare's to stray from the .223/.243/.308, and try something else more exotic ?
I have 223, 243, 308 and a 260 rem, I use the 260 for long range varminting abroad and for target, its a round that is very hard to beat on accuracy and has a fantastic long range performance that well out performs any 308 or 243, it is one of the very few rounds with a launch speed of around 2750Fps and will still be doing 1550 fps at 1000 yards, it is flatter shooting than a 243, and has much less variation in velocities and impact point for varying bullet weights, I use 123 grain Lapua and 139 grain lapua mostly, and both are nearly identical out to 600 yards, one draw back to the 260 is that it does have a tendency to over penetrate without expanding which is one of the main problems with hunting with this calibre, that was why the 6.5 mannlicher was used as an elephant gun, in skilled hands the little 6.5 bullet could drop an elephant with a single round to the head.
One of the interesting things about the 260 is that you can get 338 Lapua mag ballistic performance from a 308 based case, and it wont ever exceed the MOD high muzzle energy rules, not bad for a round that will shoot to about 1600 meters.
I had my barrel reamed so it had a loose throat, this meant that all i needed to do to replace cartridges was just neck size a 308 case down to 6.5, load it up and away i went, it works very well for me, and it produces some remarkable accuracy.
My only problem is, I made my rifle as an experiment, liked it so much I left it alone, so it isn't exactly a hunter, at 23Lbs, though fine for set position varminting, such as from the back of a pickup, bipod or bench.
Anyway here is my mechano gun as the guys have taken to calling it on the ranges, I am also banned from using it in copetitions, which says it all really.