Have some question about 40 cal.

Do the thunk/plunk test in your guns chamber(s)

They should all chamber the same. Check crimp. Should be .423 at the mouth

Also I’m not sure what kind of press your using but you shouldn’t have different lengths unless your doing it intentionally for testing

Are you seating your bullet and crimping in the same step?

Is your brass range pickups, May also have to run them through a bulge buster if they are range pickups.
Color one black with a Sharpie, put in the case gage and pull it back out, to see where it is rubbing.
That will tell you which end of the round the problem is on.

The plunk test is always best as to whether they will shoot. That said, I think you need to track down what is different about this cartridge. I wouldn’t expect it will plunk, regardless how loose your chamber may be. I would pull that apart and start over... but you may just ensure the crimp is right. Take measurements all around that cartridge and compare them to one that passes the case gauge. That’ll show you where to focus your attention.
If you are crimping while seating the bullet, then try separating that into 2 steps. Size, prime, expand, powder, seat, crimp. It may be more work, but it’s what you need to do until you get consistent results. Make sure to sort your brass by headstamp to help with consistency at the start. Helps, but not a guarantee.

Jack63 said:

This is how some fit into the gauge.

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I load .40 for a very sensitive 2011.... and that looks like a bulge in the base of your brass.

new brass? or used?

Jack63 said:

It's used Mark I have to buy the Lee bulge buster now! I thought when I deprimed it would put the case back in place.

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older Glocks have a unsupported chamber, that’s why they feed everything. But the results is the case will fire form to the chamber. And, that how you get the Glock Bulge...

if you can’t find a Lee Bulge Buster, use new brass

if you can’t find new brass, take all your brass that has been deprime and sized. Use your gauge to determine what brass has the bulge. The brass without the bulge will load just fine

Jack63 said:

It's used Mark I have to buy the Lee bulge buster now! I thought when I deprimed it would put the case back in place.

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Hopefully, this isn't taken as being a smart a**, but are you sizing as you are depriming ?

Soonerpesek said:

Hopefully, this isn't taken as being a smart a**, but are you sizing as you are depriming ?

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yeah!

get a full Size in then adjust the de primer pin

Jack63 said:

Finding 40 cal new brass is like finding hen teeth today.

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just do like I said. test your already sized brass with your gauge. if it fits, it’s good... if it don’t fit, save for later

If you are going to load a lot of 40s&w, I would suggest to invest in a debulger, or just start using the Lee FCD to do the crimping. It will take care of probably most or all of your gauge/plunking issues. You can even use the Lee FCD as a push through debulger if needed.

vaalpens said:

If you are going to load a lot of 40s&w, I would suggest to invest in a debulger, or just start using the Lee FCD to do the crimping. It will take care of probably most or all of your gauge/plunking issues. You can even use the Lee FCD as a push through debulger if needed.

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I didn’t know the FCD can do that!

Jack do you need 40sw brass? I have 1500 plus one time fired. Brass and nickle. They are de-capped and tumbled. If your in the USA 85 bucks shipped. Priority mail.

Mark_Mark said:

I didn’t know the FCD can do that!

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Jack63 said:

I didn't know that either! Learned something new, I just hope I can find new brass and bullets soon.

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Remove the insides of the FCD and push the brass from bottom, out through the top. The 4os&w FCD can be used to debulge 40s&w and 357sig brass. You also need this to push it through:


You can buy the following kit, but I just use the FCD and the push through punch. I added my own container to catch the brass.
https://leeprecision.com/bulge-buster-kit.html

vaalpens said:

Remove the insides of the FCD and push the brass from bottom, out through the top. The 4os&w FCD can be used to debulge 40s&w and 357sig brass. You also need this to push it through:

You can buy the following kit, but I just use the FCD and the push through punch. I added my own container to catch the brass.
https://leeprecision.com/bulge-buster-kit.html

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I have 2 bulge busters!

1 is none and 2 is 1

Is that homemade?

vaalpens said:

Remove the insides of the FCD and push the brass from bottom, out through the top. The 4os&w FCD can be used to debulge 40s&w and 357sig brass. You also need this to push it through:

Click to expand...

sparkyv said:

Is that homemade?

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2 lee BB’s