Some years ago I heard that rumor but in my experience handloading for it I do not think its true. Perhaps something like all those old wive's tales about damascus blowing up, etc.

Its a great cartridge and at the moment my favorite to hunt with. I load Hornaday 154grs normally. I have an old GDR Merkel drilling in and it can do this with three shots at 90m on a good day:

I use it for my deer stalking with most shots being 150-250 yards or so.

I like this cartridge so much I'm in process of getting a single shot rifle in it as well.