truck driver
Ammo Smith
- Mar 11, 2013
- 7,342
- 924
With the threat of snow and wanting to see if shortening the 200gr AB OAL would solve some of my problems I wanted to go to the range before the snow hit.
So on Monday I was greeted with temps in the 20s and clear skies as the day started so I grabbed the rifle,ammo and my range box and headed to the range.
( right now I've got about 4" of wet heavy snow and it's still rolling )
By the time I got to the range around 0930 it was a balmy 30* with a very light breeze. so I set up the Chrono F1 and set a target out at 100yds.
I started out with last years deer loads 66gr CFE223 OAL 3.390" which averaged 2834.66fps. I had enough left over that I seated the bullet down to 3.330" as shown in the Nosler manual and got 2848.33fps These had been loaded using CCI250 primers. I also loaded some fresh loads in brass that had been annealed since the other brass had numerous loading's in it to make sure I had good neck tension on the bullet. I had a open box of Federal mag primers and decided to use them to see if there would be any difference. 200gr Ab seated to 3.330" with 66grs CFE223 2859.66fps. The first thing I noticed when I shot the last years hunting load was an increase in muzzle velocity of 13fps and another 11fps by changing primer brands. I also noticed a difference velocity spread of 28fps for the CCI and 19fps with the federal, also with the bullet seated out to 3.390" I saw velocity spread of 58fps,why?
I went back and looked at targets and loads from back in the summer when it was 72* to see what if any difference there was and found the velocities higher by around 50-60fps. Checked a load that was suppose to give 3000fps and was very disappointed when it turned out to be way low 68grs went 2953,2921and 2914fps. This has me thinking that I need to get a FC die made up for better neck tension. Here's some pictures of the targets. all targets have 3 shots on them.
How often do you need to anneal brass to get consistent neck tension?
All ideas and comments welcome.
So on Monday I was greeted with temps in the 20s and clear skies as the day started so I grabbed the rifle,ammo and my range box and headed to the range.
( right now I've got about 4" of wet heavy snow and it's still rolling )
By the time I got to the range around 0930 it was a balmy 30* with a very light breeze. so I set up the Chrono F1 and set a target out at 100yds.
I started out with last years deer loads 66gr CFE223 OAL 3.390" which averaged 2834.66fps. I had enough left over that I seated the bullet down to 3.330" as shown in the Nosler manual and got 2848.33fps These had been loaded using CCI250 primers. I also loaded some fresh loads in brass that had been annealed since the other brass had numerous loading's in it to make sure I had good neck tension on the bullet. I had a open box of Federal mag primers and decided to use them to see if there would be any difference. 200gr Ab seated to 3.330" with 66grs CFE223 2859.66fps. The first thing I noticed when I shot the last years hunting load was an increase in muzzle velocity of 13fps and another 11fps by changing primer brands. I also noticed a difference velocity spread of 28fps for the CCI and 19fps with the federal, also with the bullet seated out to 3.390" I saw velocity spread of 58fps,why?
I went back and looked at targets and loads from back in the summer when it was 72* to see what if any difference there was and found the velocities higher by around 50-60fps. Checked a load that was suppose to give 3000fps and was very disappointed when it turned out to be way low 68grs went 2953,2921and 2914fps. This has me thinking that I need to get a FC die made up for better neck tension. Here's some pictures of the targets. all targets have 3 shots on them.
How often do you need to anneal brass to get consistent neck tension?
All ideas and comments welcome.