I want to use either 140 nosler PT or Hornady 139 btsp. Anyone loaded for either of these in a Ruger#1 RSI in 7x57?

I won't give my load because it's well above book max, but I get 2800 FPS with the 140 gr. Nosler ballistic tip and excellent accuracy from my Winchester M70 featherweight rifle in 7x57. usually, groups run right at .75" when I do my part. The powder I uses is W-760 but H-414 is the same thing. Just work up carefully. With the shorter barrel of the RSI, you velocity realistically might be closer to 27500 to maybe 2750 FPS.
Paul B.

In my 7x57, #1A, I load 49g of Imr 4350 w/ a 140g NP and cci br primer or 47g Imr 4350 w/ a 160g NA and cci br primer. They do not show any pressure signs but are max or just over---depending on the manual you look at. Both group and kill very well.