Savage 99's caliber a tough decision, but a fun one...
I would bet that if they again offered the Savage 99 it would first come out in 300 Savage. Not that there is anything wrong with that caliber but today the .308 Winchester would be easier to sell to the current market. I would buy one in 308 Win if it was offered for under 1000.xx dollars. The key point is that quality is worth paying for.
I'm thinking the 308 would bring in more of today's shooters. So many calibers to appeal to hunters the sky is the limit. They would still sell plenty of 30-30 models as well as my favorite the 300 sav, but to build rifles in like 260 rem, 270wsm, 257 WM ect ect!
My son-in-law inherited an old model 99 in 250-3000.It was in rough shape.We got it sighted in and on his first deer season,he killed a very nice 6 point with it.After that,the accuracy went to heck.Its from the 1920's and is just a wallhanger now.One thing we learned,due to the rate of twist,that old rifle was only accurate with an 87 grain bullet.Anything heavier would not stabilize.
Our research revealed that at some point Savage changed the rate of twist to handle heavier bullets.The purpose of the 87 grain bullet apparently was to allow the 99 to be the first rifle to achieve 3000 fps.Thus the designation 250-3000.
I don't know what the price is of an aftermarket barrel, but if the rifle is still mechanically sound you have options. A gunsmith could fit a new replacement barrel with the newer rate twist to stabilize current bullets better. This only makes sense if the rifle is worth saving.
I've owned two M99s, nice rifles. Both mine were in .300 Savage and the older one (which I believe was an EG) hunted some with me and if I'm not mistaken, took a decent Tennessee buck it's first time in the woods. Gotta love those classics!!
That's correct they 300 was the most popular, the latter 308 became very popular also. There were many calibers made during the 99's long long run and some are very collectable today. From the 22 high power to the 358 and everything in-between.