My kids have had great luck with their pre 64 M70 .243's, Mn whitetail, antelope and mule deer, a 80 grain TTSX placed right has worked just fine. I also have one as a loaner for folks just get started deer hunting up here, funny they had no idea that it shouldn't work on deer,.they've had no problems.
I've used the 243 for years. The 80 TTSX works well on game 'too big' for the 243.
I'll keep killing deer with 100 SGKs too. No problem.
