Haven't tried that combo, but have loaded the hammers in several different guns. Seat the bullet out around .020" off or so to give you room for powder, if your load density is high with the 175, you MIGHT need a faster powder, but rl26 is dense so it will hopefully work. Depending how hot your 175 load is, start about there, if it's a top end load maybe start a little lower, and work up looking for pressure signs/accuracy. The hammers generally aren't hard to get shooting well, mainly just find your max and work your load safely under it, and if the rifle and shooter are capable you should find a half-ish MOA load.
With the hammers I have loaded, I just worked up one shot per charge just going off of nosler data, or if not available other c&c bullet load data for same/similar weight, and recorded speed until I ran into pressure signs, then looked for a flat spot in velocity safely under max, and did an OCW type work up in that charge range and quickly came up with a good load.
Good luck, hopefully someone with more specific data chimes in.