When to the range today to find out what was the chamber length in the 308, 6.5 CM and bolt action 223.
Using a set of Hornady headspace gauges and a digital caliper.
The 308 brass started out with an average of 1.5948"
After firing the average was 1.6182"
Difference of 0.0234"
I was shooting 40.4 grns of Varget under a 168 gn bullet (?)
The book velocity stated 2500 and I was getting 2530
The 6.5 CM brass started out with an average of 1.5535"
After firing the average was 1.5566"
Difference of 0.0031"
The 223 brass started out with an average of 1.4503"
After firing the average was 1.4514"
Difference of 0.0011"
I was shooting 26.2 grns of CFE223 under a 62 gn Hornady FMY and the book velocity was 3000
I was only getting an average of 2680
Where would you set the shoulder bump on your dies with those differences?
The only gun that I shot @ 100 yards was the 308 because I am not having the results that I used to get. After a few adjustments on the scope I was getting every shot straight up and down (less than 1" from left to right) but the top shot was 2.5" above the bottom shot.
What do you think is causing that type of pattern?
Using a set of Hornady headspace gauges and a digital caliper.
The 308 brass started out with an average of 1.5948"
After firing the average was 1.6182"
Difference of 0.0234"
I was shooting 40.4 grns of Varget under a 168 gn bullet (?)
The book velocity stated 2500 and I was getting 2530
The 6.5 CM brass started out with an average of 1.5535"
After firing the average was 1.5566"
Difference of 0.0031"
The 223 brass started out with an average of 1.4503"
After firing the average was 1.4514"
Difference of 0.0011"
I was shooting 26.2 grns of CFE223 under a 62 gn Hornady FMY and the book velocity was 3000
I was only getting an average of 2680
Where would you set the shoulder bump on your dies with those differences?
The only gun that I shot @ 100 yards was the 308 because I am not having the results that I used to get. After a few adjustments on the scope I was getting every shot straight up and down (less than 1" from left to right) but the top shot was 2.5" above the bottom shot.
What do you think is causing that type of pattern?