May back this off a little.

[dieselrealtor]

I typically stick around the middle range of loads, enought to cycle the slide & give usable velocity. A few mousefart loads. I take unexperienced shooters out occasionally & want it to be a pleasant experience.

Did some chrony testing on 9mm hot jhp loads, don't remember seeing flow into firing pin channel on handgun loads.

This is from a Springfield Hellcat toward the top of the ladder, pretty snappy.

 

[Sigblitz]

That debunks the 'science' of firing pin impressions. They all look like they could have come from different guns.

 

[BehindBlueI's]

That debunks the 'science' of firing pin impressions. They all look like they could have come from different guns.

 

[ditcherman]

So that’s what ‘flow into the firing pin channel’ looks like, thanks for the picture!

 

[CCPLuvr]

The edges of the primer are still very radiused and not flat and square. What does the firing pin hole look like on that gun? What's your load?

 

[jwamplerusa]

May be more firing pin drag than pressure. A lot of cross face drag marks aligned with the direction of FP intent distortion.

 

[2tonic]

That debunks the 'science' of firing pin impressions. They all look like they could have come from different guns.

Was this meant to be purple?
Cause all those nearly identical indentations, and swipes, have an ejector mark clocked exactly (as best as we can tell, looking at a photo, and not thru a microscope) the same, relative to the direction of the FP swipe.

@Sigblitz , am I taking you too seriously, lately?

 

[Wolfhound]

You might want to check your firing pin channel for shavings.

 

[Sigblitz]

Was this meant to be purple?
Cause all those nearly identical indentations, and swipes, have an ejector mark clocked exactly (as best as we can tell, looking at a photo, and not thru a microscope) the same, relative to the direction of the FP swipe.

@Sigblitz , am I taking you too seriously, lately?

I've studied them closely and no 2 are exactly alike.

 

[Sigblitz]

I typically stick around the middle range of loads, enought to cycle the slide & give usable velocity. A few mousefart loads. I take unexperienced shooters out occasionally & want it to be a pleasant experience.

Did some chrony testing on 9mm hot jhp loads, don't remember seeing flow into firing pin channel on handgun loads.

This is from a Springfield Hellcat toward the top of the ladder, pretty snappy.

View attachment 332055

The extractor marks also. What grain were you shooting?

 

[dieselrealtor]

Longshot & 124gr RMR JHP's, they were clocking 1140fps from 3" barrel

 

[BehindBlueI's]

I've studied them closely and no 2 are exactly alike.

That's why it's done with a microscope and not with naked mammal eyeballs from photos on a website.

 

[Sigblitz]

That's why it's done with a microscope and not with naked mammal eyeballs from photos on a website.

My eyes are good.

 

[mcapo]

Looks to me like striker drag accentuated by marginally increased velocity?

Striker drag can be a part of the characteristics of a short slide striker gun…

What do lower velocity loads look like in the gun?

 

[dieselrealtor]

Looks to me like striker drag accentuated by marginally increased velocity?

Striker drag can be a part of the characteristics of a short slide striker gun…

What do lower velocity loads look like in the gun?

Don't have pics handy of the lower velocity ones, but they had striker drag as well.