H vs A2400, Old Loading Manuals.

[Paul5388]

Skip,

I think it was in the 5000 page thread on The LOAD that I presented this document from 1965 on "Absolute Pressure" by L.E. Brownell that stated CCI had a piezo set up (page 30). CCI was Vernon Speer's brother who was in the same town and in the same type of business.

Absolute chamber pressure in center-fire rifles : Deep Blue at the University of Michigan

This publication also states there's nothing wrong with crusher data and it certainly won't get you into hazardous loads (page 29).

If I remember correctly, I surmised Speer may have used the CCI equipment.

I also mentioned DuPont was using pressure testing equipment for their 1964 data, which incudes SR 4756 data. DuPont was the sponsor of the Brownell document through a grant.

Someplace, I found an article or something about the modified cylinder Speer used in their pressure tests (I don't know where it is now ). The "calibration" method isn't any different than what they do now, except they're supposed to use "standard" loads provided to them for that purpose.

It should also be remembered the Speer disclaimer for pressure testing is always found in the introduction to the rifle section, but not in the handgun section.

The loads using the same powders I've checked in Speer #7 vs Speer #8 have been identical, but #8 has a lot more powders listed.

 

[flat top]

Paul5388; A great paper on Absolute Pressure. Thanks for posting that again. I had read that in the late 60's...It was obtained by one of our club members at the time, and he made a few copies that we passed around amongst ourselves....I hadnt seen that in may years, and it was a good refresher.

 

[dennis40x]

Skip,
Someplace, I found an article or something about the modified cylinder Speer used in their pressure tests (I don't know where it is now ). The "calibration" method isn't any different than what they do now, except they're supposed to use "standard" loads provided to them for that purpose.

I believe the article was in Gun Digest. The year eludes me at the moment.

 

[Paul5388]

You're right Dennis! It's in the 1973 Edition on pages 24ff. I'll see if I can scan it and maybe post it on my web site. Of course, I'll read it again while it's fresh on my mind.

It's a terrible thing to lose one's memory. The whole article has already been posted here, http://www.bbhfarm.com/gallery/album18

 

[flat top]

Paul5388; Thanks for posting that article! It was a good read, and kind of fun to take a trip back in time, and be on the cutting edge of the "new technology"! The information obtained by the "experimenters" still applies today. They were very much ahead of the curve when it came to pressure testing for the revolver, and much of what they had accomplished has set the standard for modern bullet design, alloy compositions, improved accuracy and reduced pressures for revolver loads. Thanks again! FT