Throat erosion

[wboggs]

What is the consensus opinion of the effects of neck length and shoulder angle on throat erosion. Assume same caliber, powder, etc are kept constant.

 

[CaptainMal]

Don't know there is a consensus on anything here. The opinion is a longer case neck length and steeper (higher angle) shoulder pushes the flame propagation more into the case neck. That is supposed to lead to less throat erosion.

 

[Webster]

What is the consensus opinion of the effects of neck length and shoulder angle on throat erosion. Assume same caliber, powder, etc are kept constant.

My guess: It's called hot gas erosion. Regardless of the neck length and shoulder angle you have the same volume of hot gas passing thru the throat. The erosion isn't limited to the throat it goes inches down the bore.

 

[500Stroker]

What is the consensus opinion of the effects of neck length and shoulder angle on throat erosion. Assume same caliber, powder, etc are kept constant.

For an example, I shoot a 6BRX in Brux barrels, moderate loads, 108 Bergers, I can measure .001 throat erosion every 100 rounds.

 

[Northridge]

For an example, I shot a 6BRX in Brux barrels, moderate loads, 108 Bergers, I can measure .001 throat erosion every 100 rounds.

.oo1 per 100 is on the low side per 100 shots, .002 to .003 more common consider it a win win .

shawn williams

 

[Northridge]

What is the consensus opinion of the effects of neck length and shoulder angle on throat erosion. Assume same caliber, powder, etc are kept constant.

over a large test sample this will be hard to quantify as there are many things at play to promote erosion. in my personal samples at north ridge rifles the biggest difference in erosion or the rate is based of throat angle or design some simply put erode quicker than others. but almost all aspects can and will contradict one another. barrel steel, powder types, bullets cleaning methods etc. all weigh in as contributors to this topic.

Shawn Williams

 

[wboggs]

For a 6.5mm, 50-60 gr capacity, what is your choice of neck length and shoulder angle?