F Class John has posted a video using the new AMP press and one of his first tests involved chamfering. Oddly enough the best groups came from the non chamfered cases. Anyway that got me to thinking, always a dangerous thing that thinking. I asked myself what is the purpose of a inside neck chamfer? The answer is obvious of course, it provides a wedge effect for allowing the bullet to expand then neck. It also removes any burrs which could gouge the copper jacket. But consider this , the boat tail bullet is a natural wedge and even the flat base target bullets have a slight bevel at the base. As far as the burs are concerned unless you have trimmed the case there should be no burrs. Even if the case has been trimmed if it was tumbled afterward any burrs would be peened smooth by the pins or dulled by the walnut media.
anyway just curious as to whether you guys think a chafer is necessary, I am going to try some with a very light chamfer or or no chamfer just to see.
My own pet theory is the chamfers can be uneven and when the bullet exits the case and result in a uneven release of the bullet and venting off the gas in the case which could cause a wobble in the bullet the as it enters the throat.
Link to F Class Johns video
https://www.youtube.com/watch?v=yhD8nSEwJ2c
anyway just curious as to whether you guys think a chafer is necessary, I am going to try some with a very light chamfer or or no chamfer just to see.
My own pet theory is the chamfers can be uneven and when the bullet exits the case and result in a uneven release of the bullet and venting off the gas in the case which could cause a wobble in the bullet the as it enters the throat.
Link to F Class Johns video
https://www.youtube.com/watch?v=yhD8nSEwJ2c