Rifle #2: 6.5-284 with 140gr Berger BTs
6.5 x 284 Prone Rifle built up by Warner Tool Co with Masterclass Laminate Stock by Carl Bernosky, Barnard Action, Bartlein 1:8.5" twist 5R rifled barrel (31" long).
All loads used neck-turned Lapua 6.5 x 284 brass, Fed 210M primers, and naked (no moly) Berger 140gr BT Thick Jacket bullets jumped .010":
48 gr RL 17 - Mean Velocity 3035 fps, ES 17, SD 7 - No pressure issues at all
49 gr RL 17 - Mean Velocity 3078 fps, ES 25, SD 11 - No pressure issues at all
50 gr RL 17 - Mean Velocity 3130 fps, ES 35, SD 12 - No pressure issues at all
51 gr RL 17 - Mean Velocity 3185 fps, ES 17, SD 6 (Sticky bolt lift on 4 rounds - this is about top end for my liking but I would not hesitate to shoot it however if it turns out to deliver good accuracy).
Bear in mind my typical loading with this rifle is 48 grains of H4350 with a Fed 210M primer and the Berger 140gr BT Thick Jacket bullets (no moly) jumping .010". This H4350 load runs 2987 fps and has sticky bolt lift on just about every round.
Nearly 200 fps More Velocity Using RL17 with 140s in 6.5-284
In this rifle, Reloder 17 clearly enables me to run the Berger 140s almost 200 fps faster than I normally was able to shoot them with H4350 in this rifle. My previous H4350 load ran around 2987 fps with the Berger 140s and that was about all I could get out of it. Caution -- The 6.5-284 already has a reputation as a barrel burner. We can't predict the long-term effects of using RL17 and shooting 150-200 fps faster, but the higher velocities might cause barrels to wear even more quickly