B
BJS6
Guest
Just kidding with ya Al, I am sure you know that !!
Hang in there .......
Hang in there .......
JerrySharrett
Senile Member
I'm just using this to stay awake, it's going into the second nite now. They say the brain shuts down last, we might find out.....
LOL
al
Hang in there Mrs Al!! You are doing the heavy stuff. Mr. Al wouldn't have a clue!!
D
Doug Rumbaugh
Guest
My daughter did a science fair project for school with my 30 Boo Boo varying neck tension. I was there to supervise and everything was done to BR standards except the shooting. We did not worry about accuracy since they are just learning, we focused on velocities generated and extremem velocity spread. She loaded 10 rounds for each of 5 different neck bushings starting with the largest that would still hold a bullet in .001" increments. We seated the bullets with one of those K&M arbor presses with the dial indicator to measure seating pressure. Anyway, the smaller the bushing, the harder it was to seat the bullets, the higher the max number of the dial indicator and the higher the velocity. There was almost a linear relationship between "neck squish" and velocity.
0.332 0.331 0.330 0.329 0.328
Mean 2965 2975 2984 3002 3011
Min 2953 2965 2968 2988 3004
Max 2980 2984 2996 3020 3025
ES 27 19 28 32 21
My son studied seating depth in a similar fashion and found that mean velocity was not predictable based on seating depth; however, the extreme spead was affected by it.
Jam .012" Jam .006" Touching Jump .006 Jump .012
Mean 2977 2990 2962 3003 2993
Min 2950 2967 2936 2994 2981
Max 2998 3006 2988 3016 3015
ES 48 39 52 22 34
Since he went first, we used the the best seating depth from an extreme spread standpoint for her study.
Although I had to fill out all kinds of paperwork to allow them to use firearms in their experiments, they both learned a bunch about firearms and benchrest reloading. They presented their results well enough at the district level to advance to the state competion later next month.
I also don't feel at all guilty having them do experiments I wanted to do myself but never quite found the time. Hopefully they will do other shooting related experiements next year. lol
0.332 0.331 0.330 0.329 0.328
Mean 2965 2975 2984 3002 3011
Min 2953 2965 2968 2988 3004
Max 2980 2984 2996 3020 3025
ES 27 19 28 32 21
My son studied seating depth in a similar fashion and found that mean velocity was not predictable based on seating depth; however, the extreme spead was affected by it.
Jam .012" Jam .006" Touching Jump .006 Jump .012
Mean 2977 2990 2962 3003 2993
Min 2950 2967 2936 2994 2981
Max 2998 3006 2988 3016 3015
ES 48 39 52 22 34
Since he went first, we used the the best seating depth from an extreme spread standpoint for her study.
Although I had to fill out all kinds of paperwork to allow them to use firearms in their experiments, they both learned a bunch about firearms and benchrest reloading. They presented their results well enough at the district level to advance to the state competion later next month.
I also don't feel at all guilty having them do experiments I wanted to do myself but never quite found the time. Hopefully they will do other shooting related experiements next year. lol