Boyd Allen
Active member
There have some recent posts, in various threads, discussing ignition, and what difference it makes. I think that we can divide this subject into several areas: what sets the primer off, what primer, how it is seated, flash hole configuration, ambient conditions, type of propellant, etc. Differences in all of these areas may be evaluated by pressure, velocity, and ultimately, accuracy. When discussing tuning for accuracy, we talk of nodes, at various velocities, and it is pretty well accepted that accuracy, for a given rifle, and bullet, is directly linked to velocity. Velocity can be adjusted by various means, seating depth, neck tension(?), powder charge, and primer selection. This brings me to my main questions. First, what is the total range of velocities that are available by using different primers? Secondly, could changing primers take a load out of tune? Finally, if primers can move us out of tune, why do shooters test primers without adjusting the powder charge to a velocity that has been shown to be accurate?