I've been reloading for 25+ years with excellent success. Nearly every rifle has shown dramatic improvements in accuracy, and usually, velocity. Not so with my 340wby. I've tried dozens of different powder and bullet combinations and I can't match the accuracy and velocity of 210 factory loads (fortunately these shoot into 1/2 m.o.a. with good velocity 3240 fps). What gives? I've been able to get 11/2" accuracy, but not with velocity, or if the velocity bumps up, groups extend to 2" plus. I've tried 6 or 7 different powers, all at different weights, with the following bullets: 210, 225 and 250 partitions, 200 ballistic tips, 200 barnes X, and sierra 250s. To compare pressures with the factory ammo, I've been measuring case expansion (as with most weatherby factory ammo, all factory ammo leaves a modest ejector mark on the brass in this rifle). Given the free bore, what else can be done? Has anyone found a benefit in these high intensity cases using a taper crimp of some kind? The above results have been with new factory brass, fully resized brass, and partially-ie neck sized brass. I have not seen a difference with any of these different case preparation methods. Given how well the rifle shoots factory fodder, its got to be in the load preparation. Please advise!