Straight, air-cooled WW alloy (the stuff I keep getting tests around 13 bhn, gets to near 15 with 1% tin added) cast into Lyman 311041 bullets and launched out of my 336 Texan at 1850 fps using 24.5 Reloder 7 pokes small holes in deer very reliably both in and out and doesn't expand or deform much even when going straight through a rib on the way in. I used that load for many years because it shot so well in my 336, but lack of blood trail and usually at least 100 yards of tracking for heart/lung shots got old. I killed several foxes with that load and unfortunately it makes a silver-dollar-sized hole on the exit side because the hide is so thin. I'd be looking for a more pointy bullet for smaller animals, and lower velocity, like around 1300 fps. Single-load those, and go with a softer alloy for deer with the RD bullet so it will at least leave a blood trail. Air-cooled 50/50 pure and WW with 1.5% additional tin is great in the 1600-1800 fps range, probably even better with a cup-point bullet.
Could the 50/50 + 1,5% tin, heat treated, have a chance to reach 2300-2500 fps with a 210 grs bullet in a .338 WM,
with good accuracy?
It would probably do better without any additional tin, but that depends on exactly what sort of pressure rise you get with your powder, or to put it another way, how you bump them. Also, a lot of your success will depend on how well the bullet fits the gun, and your case prep techniques. For the low end of that velocity range, I get good results just water quenching from a hot mould, same thing as a medium oven heat treatment. 2500 fps might need a bit hotter heat treat, and definitely less tin fired off with as slow a powder as you can get to burn consistently, probably a ball powder.