Originally Posted by AtownBcat
So wouldn't the use of magnum primers give you a better long range load with better velocity? And I also wanted to know if you can trust the velocity that is published in the manuals or is owing a crono a must? I understand that all the long range drop tables use velocity....well you see where im going.
You can pretty much run the same velocities with magnum or non-magnum primers, in my experience with the 7mm Rem Mag, it just take 1/2 - 1.5 gr more powder to get the same velocity. In fact I've used the non mag primers and more powder to get better velocity (more consistency) than with the mag primers in MY RIFLEs.
A good chrono is a great investment and the best tool you can easily use to keep an eye on your pressures. As long as you are using appropriate powders and keeping the velocities in line with the listed velocities from reloading manuals, you can be confident that your pressures are not too high.
I use the CED Millenium II crono with the IR sensors. It works great.
Knowing what YOUR velocity is, makes creating good drop tables MUCH easier.
Here is an example for you. Dogdinger and I both shoot the same EXACT loads in our Edges. The same powder, primer, bullets and seating depth. His Edge shoots 50fps faster than mine over the same Chrono. Both barrels are made by Pac-Nor and his barrel is SHORTER than mine. He just has a 'faster' barrel! They are both VERY accurate.
Knowing YOUR velocity is very important.