I bought there regular small rifle primers during the last shortage and actually ran them in 9mm pistol rounds without a problem. Sorry doesn't answer your question. Lots run CCI 450 magnum in 6.5 loads.
I shot Some yesterday in my 6.5 Creedmoor with Lapua small primer brass. I normally shoot CCI 450's but wanted to see how they would do. The 450 's are magnums and they have a bit better extreme spread and group a little better than the fiocchi. I have a lot of the Fiocchi small rifle so I wanted to see what they would do. They may have better promise in .223 as I was getting real low extreme spread but I pierced 2 in the .223. I'm having the firing pin bushed to see If that allows me to use them in the .223.