For those with a AMP press

[rlporter507]

on your seating graph, which part do you feel is most important?
Initial smooth starting pressure, peak pressure, or final pressure?
my starting pressure has a glitch where the bullet enters, but a steeper chamfer smooths that out, but then that raises peak and final pressure.
using a vld champher has the hiccup when the bullet enters, but peak and final pressure is lower.
my peak pressure is between 15-20, and my final pressure is less than 10.
Ive been trying different things to get my graph tighter.
thanks

 

[RegionRat]

on your seating graph, which part do you feel is most important?
Initial smooth starting pressure, peak pressure, or final pressure?

The whole point to the analog graph, is to get control of each part of the graph.

So, not only is each part important, but getting the whole batch as identical as possible is also very important.

my peak pressure is between 15-20, and my final pressure is less than 10.

Sounds like you are playing with the very low end of seating forces.

In many circles those levels are for games like short range BR where the rounds are seated minutes before use and only moved from the loading bench to the firing line benches.

It would be risky to transport these levels or to magazine feed them, for example. That is not to say there is anything wrong with such low levels, but to point out that they are very fragile.

Ive been trying different things to get my graph tighter.

Yes, this is one of the keys without a doubt. It may not be obvious to all games, but when you are trying to shoot small or shoot far, it is very important.

It is also important to take your time and explore the effects of that average seating force on the target performance. Sometimes, the target doesn't care, but sometimes it can be very important.

So, intentionally swinging the seating force (neck tension) very wide to see the effects on the target are very important.

I tend to want the highest seating forces that don't ruin the target performance, but that is for pre-loaded ammo and magazine fed ammo. I'll go down to the 30 - 40 lbs force range for midrange ammo that I single feed and have to preload and transport. Any lower than that is too delicate for my life. YMMV

 

[Benchrest Braxton]

i just like seeing them have the same general curve. then ill set the high and low seating pressures aside.

dont overthink it too much. its a fantastic diagnostic tool to find outliers and inconsistencies and also automate your seating process!!!

 

[mdftr]

So interestingly, i think there's a couple of different ways of actually analyzing it from a numerical perspective - but whether you can actually infer anything from it, I'm not sure yet.

I built some tooling that allows me to detect outliers from a few different perspectives.

There's also a couple of different ways to represent the data - eg by looking at peak force (or...
Z-score, IQR, curve similarity methods, SPC charts, CUSUM, Nelson rule violations, UCL/LCL). But, you get to a point where this amount of interpretation isn't actually understandable and it's not useful!


Like others have mentioned - I've been using this for "consistency" of batches.