Speer has published load data for the 350gr Mag-Tip with a wide variety of powders, link below.
I'm using Varget for my practice loads and Alliant 2000 MR for full throttle loads. You can’t really get into pressure trouble with the 2000 MR as you can’t fit enough in the case. I've run a 2000 MR ladder test with the 350 TSX to see how much powder/velocity I can achieve and never a hint of pressure. I was really compressing the powder without reaching the top charge listed for the Speer data. I don't have my data book handy, if anyone wants my test data, let me know.
Targets below, the very first shots with the 350 gr Speer load (2350 fps) and the Barnes 350 TSX load (2535 fps), no load development, dump powder and shoot. I'm working on a load now to have the 350 TSX and Banded solid shoot to same POI.
https://www.speer-ammo.com/downloads/speer/reloading-pdfs/Rifle/41_caliber_416_dia/416_Ruger_350.pdf
Targets @ 100 yards
