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For the first time today I manually cycled the Hornady CD ammo and two thirds of the rounds did not feed properly and ended up at about a 45 degree angle without loading properly leaving the slide about halfway closed and jammed up. . .
Thank you for posting your detailed commentary.
I assume your “Hornady Critical Defense" is the 90 gr FTX with Flex Tip.
I have measured 10 rounds of FTX and 10 rounds of PCM Bronze FMJ.
Without posting all the numbers, the average length of the PCM is 0.9734”.
The average length of the Hornady FTX is 0.9689”.
The deviation between ten rounds for the FTX is 0.0120”
The deviation between ten rounds for the PMC is 0.0085”
The difference between the average lengths is 0.0045”… or about the thickness of a standard 20 lb. printer paper.
If a 0.0045” difference in ammo would cause an issue with cycling in a semi-auto handgun what ammo that’s currently available would NOT have a major failure problem?
The difference between 10 rounds of each is 0.0075”, about the thickness of 2 pieces of printer paper.
I believe the likely cause of an FTX round causing a failure to feed is because of the friction of the Flex Tip material, that protrudes about 0.026” beyond the bullet copper plating, as it contacts the surfaces of the first feed ramp and then contacting the chamber feed ramp.
My FTX have never failed to feed, but the chamber feed ramp has been polished.