Pressure sign help
- Thread starter The Flint&Fly Guy
- Start date
I'm not sure if that's a compliment or an insult. Well done.
It was a compliment to your very wise posting, it looks like some of the posters here need to have a case head separation to know what they look like.
Below is my $100.00 bent paper substitute for measuring case stretch and thinning.
The RCBS case mastering gauge can be setup to measure to .001 of an inch in case wall thickness and any thinning.
Below is a factory loaded .303 British Winchester case that stretched and thinned .009 on its first firing in my 1943 No.4 Enfield rifle. The bolt will not close on a SAAMI .067 NO-GO gauge but the Winchester brass is thinner than any other brand of .303 British case I have. And a Prvi Partizan .303 British case is .010 "thicker"at the same point and no stretching happened on the first firing. (Built Ford Truck Tough)
That's where reading reloading manuals comes into play as well. Not all of them mention or show the paperclip trick, each manual has something a bit different about checking cases, that's where it pays to acquire them. Not sure I've seen it shown on any reloading vids on YT, then again, I don't watch a lot of those types of vids.
That's the idea.
Actually the RCBS gauge I have measures the stretching and thinning in thousandths of an inch. Meaning I do not need to cut the case in half to know what is happening inside the case.
In the photo I posted of the sectioned case it stretched and thinned .009 and this was hard to feel with a bent paper clip.
Yeah, I know that. My post was referring to sectioning / halving a case to prove "for sure" the condition of an entire batch. Halving one case may tell us something but it is not "for sure". Using a gauge like yours is as close to "for sure" as most of us can get.
