ignition vs. secondary spikes

User avatar
mtngun
Site Admin
Posts: 1640
Joined: Fri Feb 01, 2008 5:45 pm
Location: Where the Salmon joins the Snake

ignition vs. secondary spikes

Post by mtngun » Sun Feb 10, 2008 5:46 pm

from the old forum:

Does ignition influence secondary spikes? Here's a repeat of the March 24 cast load with Ramshot Big Game and a 180 gr. cast bore rider, except today we used a CCI #250 magnum primer. There has been no evidence that the secondary spikes are caused by poor ignition, but just to be sure I tried the magnum primers to see if they would make the spike go away. Obviously, the spike is still there. ES was only 5 fps, so Big Game does seem to like the magnum primer, spike or no spike.
Image

Here's the same load except with a crimp and Fed #210 primers. The crimp is another test to see if ignition influences the secondary spike -- obviously not. Velocity was 2621 compared to 2664 with the magnum primer.
Image

As I see it, the secondary spikes correlate to slippery bullets, and to certain powders, but not to crimp or to primer.