I have this old High Standard 106. It shoots CCI standard velocity as well as Eley Tenex, about .75" at 50 feet from a rest. So I got a 500 round brick of the CCI stuff and weight sorted it in .1 grain increments. The lightest round weighed 50.2 grains while the heaviest weighed 51.2 grains. The weights were almost evenly split between 51, 50.9, 50.7, 50,7 and 50.6 grains. There were a few 51.1 and a couple of the lighter weights.
This ammo, weightsorted, immediately started to shoot .5" or less at 50 feet and I finally got my quarter inch group yesterday.
Today I pulled apart the heaviest and the lightest round:
The heavy, weighing in at 51.2 grains, was composed of a 40.2 grain bullet, a 10.1 grain case and .7 grains of powder. I lost .1 grains in there somewhere... I dunno where.
The light, weighing in at 50.2 grains, was composed of a 39.4 grain bullet, a 9.8 grain case, and .9 grains of powder. Again, I lost .1 grains in there, possibly due to my electronic scale's inaccuracy.
So it looks like some bullets weigh almost a grain less than others and the powder charge varies by 20%!!! I disassembled these rounds inside a ziploc bag, so I did not lose any powder.
Just food for thought.
This ammo, weightsorted, immediately started to shoot .5" or less at 50 feet and I finally got my quarter inch group yesterday.
Today I pulled apart the heaviest and the lightest round:
The heavy, weighing in at 51.2 grains, was composed of a 40.2 grain bullet, a 10.1 grain case and .7 grains of powder. I lost .1 grains in there somewhere... I dunno where.
The light, weighing in at 50.2 grains, was composed of a 39.4 grain bullet, a 9.8 grain case, and .9 grains of powder. Again, I lost .1 grains in there, possibly due to my electronic scale's inaccuracy.
So it looks like some bullets weigh almost a grain less than others and the powder charge varies by 20%!!! I disassembled these rounds inside a ziploc bag, so I did not lose any powder.
Just food for thought.