This week-end at a shoot some guy was stating that barrel life was a function of the angle of the case shoulder. I found a supporting article on the net.
The theory is this:
The tapered shoulder directs the hot gasses to a point as it exits the case. This point is where the axis meet if a line is drawn following the taper of the shoulder. So for a case with a gradual sloping shoulder this point would be further down the barrel then for a sharp slope, which could be right at the lands. They argue barrel burn takes place at this "hot spot".
Now here is the kicker: If a cartidge is designed so that the point actually falls inside the case neck, then less barrel burn and therefore damage will occur, resulting in longer barrel life. This is because the shell neck takes the punishment of the hot spot.
Bullshit or true?
I always thought barrel life was a function of powder capacity to bore size. So-called under or over bore?
Any comments on this?
The theory is this:
The tapered shoulder directs the hot gasses to a point as it exits the case. This point is where the axis meet if a line is drawn following the taper of the shoulder. So for a case with a gradual sloping shoulder this point would be further down the barrel then for a sharp slope, which could be right at the lands. They argue barrel burn takes place at this "hot spot".
Now here is the kicker: If a cartidge is designed so that the point actually falls inside the case neck, then less barrel burn and therefore damage will occur, resulting in longer barrel life. This is because the shell neck takes the punishment of the hot spot.
Bullshit or true?
I always thought barrel life was a function of powder capacity to bore size. So-called under or over bore?
Any comments on this?