Bullet shape and length

[cncgun]

I have 2 batches of 9mm... In the pix you see that the long 115gr 9mm bullet and the shorter 124gr 9mm luger. The longer 115gr has no problem feeding in my 92FS... but the shorter 124gr has a failure to feed at a rate of 7% for every 1k round. Both type were manufactured in Mexico and not reload. The shorter bullet is manufactured by Auigla... I dont remember who made the longer bullet ... Interesting fact.

[gun fu]

Mic the OAL and Crimp for reference..

I handload my 9mm minor with 124 RN and TC for my 92FS.

In my experience the 92 will swallow most if not all ammo...

Did you note if it was the same magazine with FTF?

[cncgun]

What is FTF and TC and RN...
Yes...same mag all the time.. I only have one mag.. . I never notice the length diff until I ask myself why the new batch fail to feed so much.. then I measure the length..and even the bullet shape is fatter for the shorter bullet... I think the shape and length has a lot to do with the rate of failure to feed. The spent cartridge is ejected and the new round with the shorter bullet tend to point up and jam into the upper wall of the chamber. I think the longer bullet go slightly deeper into the chamber and when the slide close.. it facilitates the bullet to align and seat itself into the barrel.... I shot over 3K rounds and has maybe 5 failure to feed, but this short bullet batch give me the most failure to feed I've ever seen roughly 70 out of 1000 rnds... then when I go back to the longer bullet.. the problem disappear...

I just did a test and found that the round shape (shorter bullet) has more friction as it slide into the barrel than the slender longer shape bullet. I think that is important as the barrel start to foul up from residue, the friction will be significant and cause more failure to feed.... I'm convince that this is the reason why

[Notsoemoemo]

I shoot berettas often. Ive never had the issue. Did you polish the feed ramp to the barrel. It should be a shiny color not too dark or dull.

[9mmepiphany]

In the pix you see that the long 115gr 9mm bullet and the shorter 124gr 9mm luger.

If the 124gr load is shorter than the 115gr one, it is seated too deep.

Are these factory rounds?
Who are they manufactured by?

[cncgun]

Augila is the manufacturer of the shorter bullet. The longer bullet is Magtech. My ramp feed is shiny...no problem with the gun. I got new bullet from diff manufacturer now...will test again.

[Carcassonne]

If the 124gr load is shorter than the 115gr one, it is seated too deep.

Are these factory rounds?
Who are they manufactured by?

+1

They both should be 1.169" (1.170") long.



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