If your 6x284 like's H4350 it will proably like RL17 better. They both have similar burn rates and you will porbably find your max RL17 load to be about 1 gr higher than the H4350, give or take. Not sure about RL17's sensitivity to temp. Have read reports saying both, stable and not stable. I'll be checking that out when I get a chance after hunting season and get some warm weather
I have begun testing. So far I can shoot a heavier charge of Re#17 over H4350 with much higher velocities with 87gr V-Max (3693 fps)and 85gr Speer SPBT. But accuracy with V-Max was poor when pushed above 3550. but 85gr Speer in front of 54grs of Re#17 I can hit a 16 oz water bottle at 230 yds placed on a rock shot off the hood of my truck. Haven't had time to shoot those on paper. Tomorrow I will plus some 90gr Nosler BTs. So I'll post latest results. But so far its thumbs up on Re#17 in the 6x284 in my 26" 10"twist Hart bbl.
How come you can't get out to the range for a couple of months ? Any how I my trip to the range was beneficial . My load sequences began at 52.2grs -54.5 grs of Re#17 both 54 and 54.5 had shinny ejector marks and stiff bolt rise. But accuracy was best ever 1/4MOA at 100 yds. Bullet was 90gr Nosler BT Those bullets shot better then any bullet I've ever shot,far superior then any V-Max.Last time at range a chronograph was used. 53.5 pushed a 87gr V-max to 3,693 .So 54grs could very well have produced 3700+ with those 90gr missiles !