I have not tried RL19 or 25. I did shoot some RL17 today at 2975fps with a 140g Nosler Custom Competition. 50g of RL17 a BR2 and Winchester 284 cases at 3.085". A little sticky...49.5 was 2940fps and not sticky. 51.5g H4831sc was 2840fps or so loaded the same way. H4350 a little slower at a little over 2800fps(2814?ave).
RL17 is the leader of the pack so far for speed. H4831sc has the smallest group and ES with 51g and a ES of 8fps for 3 shots... (.320"). To be fair it was also on the most stable shooting platform. Next up for testing is Retumbo and N560...Then maybe RL22 and RL25. I think that RL17 may be in the cartridges I take elk hunting! Groups were promising but we will see once I go out to 400yards.
37 bullets down the pipe on the Savage LRH I bought recently, 3 powders and about 13 different loads 2 different bullets and 2 scopes so far as far as I can remember. Fun stuff!! Rang the first gongs with the 6.5x284 today!! Doesn't even dent the AR500 steel gongs I got here!!