Let me add this to maybe help anyone with Wolf/Tula primers.
I recently bought 9K of KVB-223EM (magnum lead-free) from Midway when they were on close-out special. For positive sure, they give me very brief hangfires with WW748 and WC846 in .223 cases at least 50% of the time. They also give me brief hangfires in 300BLK with H110 and WW296 about 50% of the time. They do not give me hangfires with Bullseye in 300BLK or IMR4895 in .223. I will use them up in my Bullseye light subsonic frangible bullet loads in the 300BLK (giving very nice accuracy BTW), but will NEVER buy anymore of them. While they ignited my IMR4895 .223 loads, they caused the group size to double over the CCI #41's I normally use in that application.
KVB-223M has NEVER given me a hangfire in any caliber with H110, WW748, WC846, Bullseye, WW231, or Unique. I have gotten 1-3% failures to fire when using them in a Handi Rifle, Remington M700, and Remington Model 7. I believe they are too hard for those 3 rifles. I've now switched to using CCI #400 in those rifles with no more failures to fire. When I switched to the CCI's, the accuracy remained the same; 1 rifle needed a couple of clicks to get it sighted back in at 100yd; 2 rifles remained sighted in as-is.
I use the KVB-223 in 30 carbine with WW296 with NO hangfires. I use the KVB-223 in 300BLK with Bullseye, Unique, WW231, and moderate loads (not full pressure loads) of H110 with NO hangfires. I bought the KVB-223's from a friend at a fire-sale price because he said they gave him hangfires and even failures to ignite WW748 in .223 cases enough to go bang, but no problems when using IMR4895 in 223 cases. I've never tried the KVB-223 in the .223, so I can't comment on that application.
The factory primer part numbers (such as KVB-223) will be on the outside of the cardboard box containing 5 1000 count boxes of primers, but not necessarily on the 100 or 1000 count boxes of primers. The 100 or 1000 count boxes of primers will have differing primer names on them FOR THE SAME FACTORY PRIMER PART NUMBER. This sometimes results in sellers to calling the primers different names FOR THE SAME FACTORY PRIMER PART NUMBERS.