I think I have six 243s right now, shows you what a crappy cartridge it is when a guy needs 6 rifles in the same cartridge to get the job done............I guess I should sell them all and buy a 6mm Rem, problem solved. Actually I have had a 45 year love affair with the 243 and have completely shot out 2 rifles in this cartridge. By my rough calculations I have fired somewhere approaching 50,000 bullets down different 243 barrels over the years, and for what it was designed to do I have never found it lacking. Yes the 6mm may get a few more fps but it really is insignificant in the overall picture. And yes, I have owned a 6mm or two and a 6mm AI and a couple 6mm-284 Win, which I really like and would have to say is a significant step up in 24 caliber cartridges, but I still seem to buy every deal I find in 243 Win.........I have 3 full stocked ones, no one needs three 18-20" barreled 243s but none the less I have them.......Then I have a very nice old Browning/Sako one with a fairly heavy two step 24" barrel, a 22" barreled 700 Rem, very old but in a new CDL stock, and I know I have another 1 or 2 but can't think what they are right at this moment........and close to 1000 brass for these rifles, some of it more than 50 years old made from DA, LC and newer IVI military 7.62 cases........still loads and goes bang every time without fail.
I love my 243s and have killed a "trainload" (as Eagleye says) of coyotes, crows, pigeons, badgers, gophers, jack rabbits and other varmint type critters. Think I have only shot 2 wolves with them and 1 big black bear and a couple or three antelope.........not much in the way of big game but every thing else sure caught hell.............