Muzzleloader question

[sacan]

I purchased a muzzleloader at wholesale a while ago, and I asked the gun counter guy to sell me everything I need. I am new to muzzleloader. He gave me 209w primers, and they seem to not fit. I just checked the manual and it says the rifle takes 209 primers. What's the difference between the two? Or am
I doing something wrong?
I find it strange that I can't find anything on google regarding this