Sep 30, 18 · Compared to the 2506 Remington, the 257 Weatherby Magnum pumps out roughly 600 fp more energy at the muzzle and 150 to 0 fps more velocity One of the reasons the 257 Wby Mag goes so fast is its allowed pressure, 65,000 psi The 2506 is limited to 63,000 psi, the 65 Creedmoor 62,000 psi2506 Remington Brass 257 Roberts P Brass 257 Weatherby Brass Reloading Information Load Data &Technical Information by Cartridge Load Data &Technical Information by Caliber Reloading Glossary Load Data Downloads Open up the load data page you wish to downloadJun 14, 09 · Joined Dec 7, 03 · 2,346 Posts #5 • Jun 13, 09 I own a 257 Weatherby and a 260 Remington The latter will do 95% of what the former will, and most shooters can live without that last 5% Get the 260 It makes a great LR varmint round with the 90grain TNT or the 95grain VMAX, and the 140s will do things no 257 Roberts will ever do 25 06 Remington 100 Grain Nosler Ballistic Tip 100 Hand Loaded Choice Ammunition What is a 2