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Old December 23, 2019, 04:54 PM   #150
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Join Date: March 2, 2014
Posts: 9,218
Good thinking
It's rare--but it does happen very now and then.

Today I loaded up some .355 bullets in starline cases all of which were trimmed to 1.703. I was able to get a COL of almost 2.27 with 125 gr extreme penatrators. These bullets do very well in my past experience even when driven to rifle velocities. I used H110 this time and brought charge weights up to what QL predicted to be around 50,000 psi.

The first three charge weights functioned exactly like factory ammo I've shot--accuracy OK, but the brass was coming out nice and clean with no signs of pressure. Then, by the 4th charge weight, I still was getting no pressure signs, but now gas/crud was obviously leaking down the side of the case whereas the case was coming out entirely clean except at the mouth previously. I have no idea whether this had something to do with the charge or if it was more related to timing. I'm losing confidence in being able to really have a good idea of what's going on

Having the wrong step profile could lead to an infrequent and random problem.
Makes sense, I don't recall seeing an issue with the step when I did the chamber cast, I tossed it somewhere in my black hole drawer and will see if I can find it again.
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!
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