I just went downstairs to check a box of Remington 6 1/2 primers and this is what is printed on the side of the box: Do not use 6 1/2 small rifles primers in high intensity rifle cartridges such as the 17 Rem, 222 Rem., or 223 Rem. I use them in my 22 Hornet and 218 Bee. I will not use the 6 1/2 in my AR's under any circumstances. Nor will I use them in 223 bolt gun that are used for Prairie Dogs.
