will for this project i wont be firing any real cartridges.
i have ordered a liner from a suplyer in the US (Brownells).
.22 CALIBER LINER - For .22 Short, Long Rifle and .22 WRM.
SPECS: 4140 steel. .223" (5.6mm) groove diameter for .22 Short, LR or WRM (only if gun was originally chambered in .22 WRM). 1-16 twist (LR and WRM) or 1-20 twist for Short. 5/16" (7.9mm) O.D., 25" Liner - 26-3/8" (67cm) overall, 25" (63.5cm) usable length. 32" Liner - 32" (81.2cm) overall, 30-5/8" (77.7cm) usable length. Not chambered.
so im guessing that this should be fine for what i need.
thanks for the help.