35 Whelen or AI. 250 gr bullet at just over 2700 fps in current Speer data for the standard Whelen, AI can get a bit more velocity as per working up loads with 2000-MR (the powder Speer gets over 2700 fps with in the std Whelen).
JES can rebore an existing '06 for example for a whole lot less than a new barrel or new gun. Then you've got money to burn on components for loading at today's high prices when you can find them.
My elk load is the 200 TTSX which has a better BC than the 225 TSX and can be moved out at 3000 fps and a bit more in my AI by extrapolating starting loads from the 180 and 220 gr bullets in current Speer data (Power Pro Varmint) and working up. Expands much more quickly on impact compared to the original X or TSX design based on field dressing observations (elk/mule deer), minimal meat loss (as with monos in general), penetrates and reaches the vitals as it keeps going out the other side from any angle I've taken, not just broadside through the body cavity.
Sierra current data shows 2900 fps for their 225 Game King as well with CFE223 and 2000-MR. Not that I would use that bullet on elk or moose, but shows Speer is not off base with their results.
This is a reality for the Whelen in this day, with reputable load data backing it up.