Unless your action was a Short action magnum or a target action, The chance of you having the larger diameter barrel tenon threads is unlikely. The small Tenon barrel threads should measure just under 1.0625, as in 1.055 plus or minus. It uses the longer barrel nut. Barrel nut length is a common indicator of the size tenon you have.
You can determine the action length by measuring the action screw spacing center to center.
To do a 20 practical with your current 22-250, your bolt head will need to be changed, the new barrel will need to be head spaced and the firing pin protrusion may need to be adjusted depending on your firing pin design.
You will need to find a 223 magazine unless you want to single load. you might need a single shot sled to make it easier.
All in all there are better options for less hassle. Like buying a 223 and changing out the barrel to the 20 practical. Donskey
If you have a VLP, that is a beauty and I would not want to do many things to alter it to where it could not be put all back to factory. It is your rifle and Savage 110's short actions can be modified from a 223 to a WSM and more. After you have modifed 30 or 40 you realize it might have been better to just buy something closer and change just the barrel. Blah Blah Blah. Then again it the journey for some that make life grand. To quote on of our favorite contributors..."what a ride".
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