Start with any 7mm RemMag load less 10%.
4350, 4831, W780, H450 all work well. Magnum primers too.
Earlier Hornady books have loads for the caliber.
Be aware there are two kinds of 7x61 brass out there, the older has less capacity.
The newer one is headstamped "Super"
Also some S&Ls have a 1 in 12 twist and don't care for heavy bullets.
In a 1 in 10 a 140 TSX or in a 1 in 12 a 120 TSX will kill anything in the lower 48 at 3100-3200 fps.
Excellent cartridge that has a high "cool factor", albeit no advantage over the 7mm Remmag.