Most local gun shops sell primers by a 100. If you lived near me I'd just give you a 100. For hunting accuracy it will not matter, but many target shooters are finding that they are getting lower velocity variations, therefore better accuracy with standard primers. As mentioned, you'll have to re-evaluate your powder and grains used as you are changing primer, and that makes a difference. Do a search on google for 300 WM and the primer you buy. Make sure to verify that load from several sources to make sure someone did not mis-type the load information. Good luck.