The old CVA plug to the right. Some of the time it ignited Blackhorn much the same as the new plug, the QRBP on the left. Western Powders provided a QRBP that would reliably ignite Blackhorn every time, but never did provide a plug for the older rifles making them reliable for Blackhorn. Rifles using the new Western Powders QRBP burn Blackhorn just fine. Strange, CVA never made a plug for the older rifles that would reliably ignite Blackhorn. All these years since the introduction of Blackhorn, folks have been sending me dinero to modify the old plug so for to be reliable burning Blackhorn. Thousands of dollars.................strange 'eh?