Thread: Double grouping .... likely causes ?

Ladder test is great place to start in determining safe and max pressures for rifle/powder/ combo. But don’t tell you much if anything about accuracy. In my case above ladder tests done at start, but provided no clues about inherent accuracy or lack of. @csmiffy ladder test is a series of loads usually 0.5 gn powder more than previous one going up to book max, or slightly above if you take care and observe pressure signs carefully as you work up from lightest load. To be useful needs to be done with a chrony so you can measure speed for each load, and that will tell you quickly if the pill/powder is going to do what you want in your rifle