When saying a particular caliber will replace several others,and in such a large weight range, we have to be careful of where we are in the food chain when we step up to throw our hat in the ring,..... and a .243" is a little too far down the chain, to make that bold claim, especially concerning the .308Win.
The .243 is a sweet cartridge, i've owned only one and for years loved it for it's accuracy and gentle recoil. Traded it off for a nice .308 a long tome ago, but with for years now leagl for coyote here, wish I still had it.
It doubles from gophers to deer, but finds it's niche, I believe, in a superior wind bucking, long range varmint,coyote, seal(eastern) etc. Anything around 40 -70 lbs range you want to flatten out to 300yds, and kill out to 425yds, the .243 will serve you well. Look at the family dog around 60lbs, and when hes wondered out to where you can barely see him, this is animal size and range the .243 was built for. Perfect balance.
For heavy whitetail, use the heavy bullets, and it will approach an honest 200 yd rig, though expect at times to have to look a little for some. As reliable as a .308 on deer? Sorry never was or will be. Never was meant to be.
It will never be a .223 for the economy and pleasure to shoot as a pure varminter, and anyone in the know, will tell you, it will never,ever be a .308Winchester, nor can it be. The .308 with proper bullets is a great Moose harvester to 200yds, I said harvester, not killer. You get to eat from the harvest, one that merely kills sometime in the future, but is lost,..is no good to anyone.
