Buckskin, I am glad you enjoy your new .204. I do not agree with many of your statements however in regards to the ".204 or 22-250". There is a reason the 22-250 earned the name "Varminter".
" If you can shoot the 40gr v-max (mine does not like them at this point) it beats the 22-250 in every catergory." You say this (my pal's .204 does not like the 40 grain either btw) yet when you compare you use the 40 grain rather than the 35 to stack in favor of the .204.
Use what people are shooting and compare .204/32 grain, 22-250/55 grain (not 40 grain)
Reality looks like this from Hornady's site. .204 32 grain V-max @ 500 yards 1899 fps / 256 ft lbs. 22-250 55 grain v-max @ 500 yards 1880 fps / 432 ft. lbs...........thats what people shoot (and you know it)
Now what were you saying about drift ? How about killing power ? 9 out of 10 22-250 shooters including myself shoot 55 grain first 50 grain second,
nobody shoots a "40 grain".
"short barrel life 22-250" Where did you get that from ? Barrel life depends on barrel quality and over heating & proper cleaning. My Tikka T3 Varmint has a heavy Sako match grade barrel on it in 22-250. I don't shoot bench rest just sand bags at the rod & gun and varmint hunt. I will not shoot this barrel out in my lifetime (mid 40's now). Yet we really don't know about the .204 yet do we.
The link you posted on the .204 ends with this "Logically if we burn less powder we have to give up something. What we give up here is energy. The Swift achieves its ballistics with heavier bullets than the .204, and these heavier bullets carry more energy. I'm not about to retire my Swift; I can imagine circumstances such as coyotes or rockchucks at 400 500 yards when I'd feel happier with the Swift's heavier bullet. For most of my varmint shooting the .204 already has more than enough energy.
On gopher and prairie dog shoots I think the .204 should prove just about perfect."Exactly........."praire dogs" You said " you don't need more than 40 grains for varmints". Yea........for praire dogs, coyotes the prefered ammo is 55 grain, caliber is 22-250 and .223. How about woodchucks at 400 yards.........your pushing it.
Varminter as in 22-250 stands for all around.
Accuracy - The 22-250 was used in Bench Rest some. Along with the .223 it often wins factory gun bench shoots, egg shoots, etc. Some .204's are accurate but they are not more accurate.
Bottom Line I would not suggest to your buddy to buy a .204 barrel for his Thompson Center when he already has a 22-250. Heck if your going to do that. Have him start over with a real rifle like a Tikka T3 Varmint or a Sako

:-D
I like new varmint rounds including the .204 (very much in fact). But, to post mis-leading BS is another story. The .204 fits right in with the .222,.223, 22-250 & Swifty on the light end............but not better than the 22-250 in anything (my oppionion).