The only primer i could find here, when i started out was the W209. W209 is the only primer i ever used in my Omega, until i read about ridding my rifle of the 'crud ring'. Then i switched to them low power primer, and also tried them vari-flame adapters. What i found, was there was no way to get rid of the 'crud ring', and the W209 primer was a good fit for my rifle.

When i started using BH, i used the W209 primer with no issues. Then i read i was supposed to be using magnum primer, so i tried them 209A primer, and them CCIm primer. What i found out was the W209 fit my Omega better than any other primer, which resulted in less blow by.

All primer are not the same length. The W209 primer are about the longest. TC obviously wanted their rifle to work with all primer. TC makes their rifle to closer tolerances than some others. W209 primer fit tight in Omega(s). Other primer fit looser.

W209 primer work good igniting BH in the Omega, because the breech plug has good geometry for BH, and the W209 primer fit nice and tight. W209 primer have little or no blowback in Omega rifles, because they fit nice and tight; all other primer must be some looser.

I have never had the patience to test for Accuracy using primers other than the W209 in my Omega, because the W209 are accurate, and clean.

However, in my CVA rifles, i use STS primer, because CVA breech plug needs modified to be reliable with BH. When i work the CVA plug, i make them so that the STS fits nice and tight. The STS are clean and accurate in my CVA rifles. The length of the STS seem more consistent than the length of the W209, but i haven't noticed they are more accurate.