Coalminer7,
I'll second what Steve says about making your varminter shoot like a 223.
IMO the value will take a nose dive ,although that might not matter to you.
On velocity question i have did some reading ,remington had some good info. but i don't see it on their site anymore.
Example -if you were to break velocities down in 100fps increments the higher the velocity you shoot the more fps you'll lose per inch of barrel.
If you are shooting a 40gr bullet at 4000fps you'll lose the 50ish fps /per inch.
With a 55-60 gr bullet you'll lose 20-30ish fps ,these are only examples of coarse relayed to you from my reading.
Just me thinking out loud ,i don't see how the chop would help to any great extent.
You have a ledgendary varminter known for high velocity and extreme performance.The 22-250 is somewhat overbore and belching more powder out the short barrel is going the wrong direction imo.
I have a little CZ 221 fireball as my handy little calling rifle and just love it so i know what your saying wanting a nice -swinger-.
My 22-250 should be ready within a couple of weeks -being rebarreled to a 26" #4 contour ,it's my open country coyote pounder.
Best of luck .Mike