In the past month i have read some strange idea, compared to my own, regarding the strength of different brand of primer. This led me to think; naturally this led to trouble.





That there is the way that was dreamed up to test primer strength. The clock is set about 2' from the muzzle of the rifle. The rifle is rested on the pad at the same point every time. The light is shown on the ceiling for to create a 'sky' for the Pro Chrono to 'see' the sabot fly under. The speed of the sabot was measured by the chronometer many times for 6 different primer. The rifle was fired at the garage door so the sabot shot out the barrel flew over the Pro-Chrono.

The Accura was loaded for each test with short black harvester sabot, and shot with different primer. Two different breech plug were tried; one being home made, and the other a CVA factory plug. Results were erratic. It may have been a waste of time and money. Here below is an average of averages of the results.




Most of the sabot ended up on the floor behind me, however they were scattered all over the garage.

It was surprising how dirty the breech plugs became without any powder being used. The flash channel had to be drilled out several times, because the speeds became very erratic. It seems the primer has more to do with the hard carbon build in the flash channel, than the powder.

The two breech plug produced similar results, except with the 777 primer. When the CVA plug was used with the 777 primer, the sabot had zero velocity i.e. the sabot did not make it out of the barrel. This didn't seem possible, so i tried it several times to no avail. The 777 primer drove the sabot down and out the barrel when the the home made breech plug was installed, but not with the CVA breech plug.