Thread: Case weight variation powder capacity and significants on the target

My OCD kicked in today.

A few months ago I weighed 5 of each of several brands of 223 cases. Came up with an average.

As you will see the weight varies from 91.3 to 103.7 grains for the S&B (way out there) so I decided I wanted to know if there was a great difference in powder capacity for these cartridges what I did was I took five ADI cases at 94 grs and weighed them then 5 hornady cases ave 91.4.

I chose to ignore the 3 heaviest esp S&B as they do not seem to be typical.

I filled them all to the top of the neck with AR2208. In addition i used an electric tooth brush to vibrate them to settle the powder. Capacity only varied from 28.0 grs to 28.4 grs!

What are people's opinions?

Would mixing cases:

Change group size significantly?

Change point of impact significantly?