Thread: 223, fmj ADI load data question

Greetings @Rn-85 and all,
The original ladder test, developed by Creighton Audette, was to fire a series of single rounds loaded with small increasing increments of powder charge. This was done at several hundred metres looking for series of shots that were closer together than others. What it has come to mean for many is firing a series of separate 3 shot groups at 100 yards or metres with small increments of increased powder charge. Often one fluke small group is fixated on rather than a progression of tightening and spreading of groups and variation of the position of groups on the target. To me establishing a likely maximum velocity for the rifle, based on several load data sources and working up to that quickly makes more sense. The components saved can be used for fine tuning the load or shooting stuff in the field.
With regard to your loads @Rn-85 try to get someone to chronograph them for you as this will show how your rifle is performing. Your ADI cases should weigh close to 97 grains with primer installed which is the same as the Winchester cases I have weighed and around average for most US cases. The Hodgdon/ ADI data is loaded in Win cases so your results should be close. In my T3 Lite 25.5 grains of AR2206H chronographs around 3,150 fps, close to the Hodgdons data once charge and barrel length are allowed for.
There is a Handloaders Club in Christchurch that could be worth looking into if you have not already done so.
Regards Grandpamac.