I don't have any testing pictures of anything.
Just providing my inputs with WHYs.
'Pull force' and friction in general is irrelevant to neck tension and internal ballistics.
If you'd like to test that take two necks, one squeaky cleaned inside, and one dry film burnished with tungsten disulfide(WS2). This will produce way different seating/pull forces.
Shoot them across a chrono and note zero difference in MV. Tune does not change here either.
But like I said in contrast, and anyone here can test it: change neck sizing LENGTH, and MV & tune will change.
The reason is that bullets are not pushed from necks. If they were, everything would be different.
Bullets are released -from neck expansion.
And a neck only needs to barely expand to fully release a bullet, so necks barely need clearance to perform their function just the same. Doesn't matter if 1/10thou or 5thou of neck clearance.
Now someone will say that they need more neck clearance to shoot well,, but they never say WHY.
They never say WHY about anything..
The reason for the clearance/result disparity is chambered tensions, from TIR, from FL sizing of thickness variance.
There is of coarse a test for this as well: stop FL sizing to see ammo straight enough to fire well with tight neck clearance. I know you don't want to do that, it's just another test to prove my point.
Then you can go back to what you do, but I doubt that's more important than the learning in this.
The anecdotal 'when things work well this is what I see', doesn't actually help someone with completely different circumstances to solve their problem. For instance, nobody has declared how to get a sine wave neck sooting, -because 'this is what is happening'. So is it really helpful? Would it apply to 300WSM as it apparently applies to 6PPC? Could it be implied that you MUST have a sine wave to shoot well?
If not, then when & why a difference?
Just providing my inputs with WHYs.
'Pull force' and friction in general is irrelevant to neck tension and internal ballistics.
If you'd like to test that take two necks, one squeaky cleaned inside, and one dry film burnished with tungsten disulfide(WS2). This will produce way different seating/pull forces.
Shoot them across a chrono and note zero difference in MV. Tune does not change here either.
But like I said in contrast, and anyone here can test it: change neck sizing LENGTH, and MV & tune will change.
The reason is that bullets are not pushed from necks. If they were, everything would be different.
Bullets are released -from neck expansion.
And a neck only needs to barely expand to fully release a bullet, so necks barely need clearance to perform their function just the same. Doesn't matter if 1/10thou or 5thou of neck clearance.
Now someone will say that they need more neck clearance to shoot well,, but they never say WHY.
They never say WHY about anything..
The reason for the clearance/result disparity is chambered tensions, from TIR, from FL sizing of thickness variance.
There is of coarse a test for this as well: stop FL sizing to see ammo straight enough to fire well with tight neck clearance. I know you don't want to do that, it's just another test to prove my point.
Then you can go back to what you do, but I doubt that's more important than the learning in this.
The anecdotal 'when things work well this is what I see', doesn't actually help someone with completely different circumstances to solve their problem. For instance, nobody has declared how to get a sine wave neck sooting, -because 'this is what is happening'. So is it really helpful? Would it apply to 300WSM as it apparently applies to 6PPC? Could it be implied that you MUST have a sine wave to shoot well?
If not, then when & why a difference?