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Old December 29, 2019, 08:20 AM   #188
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Join Date: March 2, 2014
Posts: 7,821
Truth in lending: The Lil'Gun anomaly occurred using the LEE 358-200 cast at 42ksi indicated -- and measured velocity was waaaay outta whack* to where I couldn't even jigger Lil'Gun's burn parameters to match it at all -- but the incipient failure mode was the same as yours.
One thing about your QL settings--are they set for start pressures for rifle FMJ core bullets? It probably comes up with a default start pressure for pistol bullets (2000 psi or under vs. 6500 psi or more). Adjusting for the start pressure weighting factor, I can get my velocity results within what I'm actually recording on labradar, even though they are well over "published" results. When you adjust that start pressure--you can also see that peak chamber pressure is correspondingly attained much faster. I would love to get my hands on a conventional bolt gun and test the same ammo--but I'm not willing to waste that kind of money on this at this point.

Using a start pressure of 6500 psi for Hodgdon's published load 26.7 max for H110 for a 170 interlock, QL returns a velocity of around 2300 fps--which in fact was what I got when I shot it (interestingly, top velocities were achieved with charges well under that, so I'm assuming a lot of the added pressure is simply being dumped when the case releases and leaks in the chamber). QL also returned a pressure rating of almost 64,000 psi for that load. I believe it.
If you’re ever hiking in the woods and you get lost, just look up and find the brightest star in the sky and you’ll know which way space is.
I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!

Last edited by stagpanther; December 29, 2019 at 08:38 AM.
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