Thread: .300 WSM variants

Originally Posted by Micky Duck

so..is that to get around the patent crap around anything 7mm??? the 7mmwsm had some sort of "thing" that made it expensive
there is a 270wsm already so is this the same or just renamed to get around patent???

Greetings @Micky Duck,
There was a problem with patent infringement which I believe resulted in the lack of new medium size 7mm cartridges for about 20 years. The big two, Winchester and Remington thought they could get away with it but could not and sulked for a long period. The longer head to shoulder datum dimension with the 7mm WSM is to stop the 7mm WSM being chambered in a .270 WSM and blowing it up. Remington did the same thing with the .280 Rem to stop it being chambered in a .270 Win. Some manufacturers now seem to have got over their funk and we have the 7mm PRC although this is a longer case. We can also likely thank the debacle for the US manufacturers getting over their hatred of anything 6.5mm. The grandfather of the short fat cartridges was, from memory, a shortish cartridge based on the .348 Win case with the rim turned of and an extractor groove added in the 1950's, the same parent case the WSM's use.
Regards Grandpamac.