Whats wrong with the good ole 7mm?

Absolutely nothing wrong with the 7 RM. Accurate, hard hitting cartridge. But, the belt will eventually doom it. Rounds like the 7PRC , 7SS, etc. Will take its place because they are easier to load and case life is much better. They are easier to manufacture than the RM because of the belt. The 7 RM "will" separate at the belt far sooner the the 7 PRC will have any issues. Just the way of things, progression of ammunition leaves the older designs behind.
 
Absolutely NOTHING WRONG or bad about the 7RM. Have had one for decades and it’s accurate. I’ve gone back to more “classic” cartridges like the 06, 308, 280 Rem, 7x57, 257 Roberts, etc. Newer powders get higher velocities from the classics, rifles are lighter, and don’t burn as much powder, but I break out the 7 RM & 30 WM mag when ranges hit 500+, which is rare for me anymore.
 
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