Re: 300 Norma Improved 40 degree
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Blackhawk41</div><div class="ubbcode-body">From my understanding decreasing pressure by changing the shoulder angle will decrease overbore could be wrong but it makes sense in my head. Decrease the pressures at which the gases escape the case you decrease the erosion to the throat.
If I'm wrong please tell me why.
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You are right about the decreasing pressure helping to save bore life. However, increasing shoulder angle increases volume. While initially decreasing pressure because of the larger volume, it inherently increases pressure faster as you move up the powder charges.
More aptly, it increases the pressure curve.
Stay below where it's hot with a slower powder and you will see better case/bore life results and thus longer accuracy life. Go above the line consistently and it will burn up throats and trash cases much faster.