Re: tikka barrel life 22-250?
The 22-250 is a lot of fun but most factory rifles don't have the twist rate to support heavy bullets in them. I don't know if this is the case with the Tikka but that's a major thing to check before buying it.
The nice thing about getting the 243 right now is that you don't need to change out equipment when you rebarrel.
If you're worried about wait times, then buy whichever one you like now and put the barrel, stock, and other accessories on order. As they begin filtering in over the next 5-9 months you get to shoot the rifle, hone skills, and once the parts are all in the pile then you can ship it all off to the gunsmith with a large reduction in lead time.