Originally Posted by 5shot
You can't just sub the PT for the Hot-Cor...more bearing surface, so more pressure. Found that out myself.

Interestingly, I have found the opposite over the 25+ years I have been working with the Whelen (mine's an AI, but same-same). I have found the Speer 250 HotCor to be the perfect analog to the Nosler 250 Partition in my rifle, and I use the HotCor for any initial load work with new powders before switching over to the $1.00 bullets. I get the same velocity, pressure (near as I can measure) and POI for a given charge of powder with the 250 HotCor as the 250 Partition. YMMV, I reckon.

Speaking of new powder, Power Pro 2000MR has been astounding to me in my rifle with both 225 and 250 bullets.
With 200s (Barnes TTSX) I get nearly 3000 FPS with Power Pro Varmint (2000MR is, IMO, too slow for the 200 grains).
I put a lot of research on this thread that might be helpful. You'll have to wade through a bunch of gum-flapping to get the good stuff but it's there:

My work with Power Pro Powders in the Whelen

Cheers,
Rex