Hey - I´m geting 2930 fps with 120grs NBT out of a 22" Barrel! Its not a high pressure load - so easy going. I use Norma brass, Fed. 215M GMM and a good dose of MRP (max load by Norma...)! No recoil and no signs of pressure (not a bit on primer and no case head swelling).
Did a little reloading/shooting this weekend. All with 140g AFrames and once fired Nosler brass, CCI 200s. Seated 0.0625 off lands, per Swift ballistician suggestion. Lands measured using Hornady OAL tool. Two 6.5x55s - a CZ 550 with full Mannlicher stock and Nikon Monarch 3, 3-15-50. Also a TC Encore with EABCO 22” barrel. Vortex Viper 4-16-50. Both rifles hated RL19. Tried 44.0g and 45.0g, groups in the 2-3” range, std dev too high on 45.0g. No problems ejecting or flattened primers. Velocity in the 2570-2600 range. Not much vel pick-up with 45.0g. Maybe 25 FPS. Both rifles shot sub-MOA with IMR4831. Much lower std devs. Interestingly, both 44.0g and 45.0g shot faster out of the Encore than the CZ - about 75 FPS faster. Again no pressure issues. 2660 FPS from CZ and 2735 FPS from Encore with 45.0g load. So here’s my go to load for now in both: 45.0g IMR4831, CCI 200, 140g AFrames, seated 0.0625” off lands. I may monkey with the seating depth a bit at some point.
You SHOULD be safe with 48grs of 4831 - this powder uses approx. the same data als N560!!! I load even more.... but every reloader is self responsible - so you have to decide what to do. every gun and lot of powder is different.
