I talked with Silencerco previously and they said as far as the suppressor I could go down to 16. I was referencing here more of stabilizing the bullet.Probably should ask your suppressor manufacturer. Blast will certainly increase as you shorten the pipe but I've never seen a .22-250 with that short of a barrel.
Well from my understanding as a general rule you usually lose around 50fps per inch of barrel cut so if your losing 8 inches your looking at a possible 400fps drop which is a lot.I have an sps varmint I want to cut down to 18 inches to be easier to maneuver with my suppressor. Is 18 enough with a 1:14 twist? Likely shooting the 40 gr vmax.
Do you shoot deer with yours or varmint/predator gun?Towards the back of the Sierra manuals there is a section on Single Shot Pistols which includes the 22-250 but the barrel they used is a 1:12" twist 15" barrel but they do list loads up to their 63 grain SMP .
However if we look at the 222 Rem loading data they used a 1:14" twist 10" barrel and their loading info goes up to their 52 grain HPBT and 53 grain HP Match King. In the 50 grain section they list among others the 50 grain Blitz which is longer and obviously heavier than your preferred 40 grain V-Max.
This suggests to me that your 1:14" twist barrel should easily stabilize the 40 gr V-Max if you were to shorten it to 18 inches.
I am shooting 55 grain Sierra Game Kings out of a 1:14" twist 22" 22-250 barrel at 3600 fps and know a guy that is shooting the same bullet out of his 20" 1:14" 22-250.
For many years I used a Carl Gustaf 9000 (Husqvarna 1900) in 22-250 with a 23.5" 1:14" barrel for all my hunting. It accounted for over 100 deer, mainly Red deer plus a few Sika and a very large Sambar stag. Also around 20 pigs, a truck load of goats, wallabies, possums, rabbits, hares plus a few feral domestic cats.Do you shoot deer with yours or varmint/predator gun?