I am wanting to try the 110 ELDX in my 257Wby to improve long range capabilities. My question is what powder would guys here suggest I use. On hand I have RL22,Retumbo,RL25,IMR and H 4831,IMR 7828,RL19 and IMR and H 4350. My thought was that retumbo should give the high velocity I amlooking for but according to my speer manual it does not. The Nosler manual says IMR 7828 will give best velocity followed close by RL 22. With the 100gr Barnes TSX RL 22 shoots fast and great accuracy. My goal here is to get 3500 or more fps with the 110 ELDX. My current load shoots the 100 TSX at 3602. Any help here will be great.