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Pressure - Reloading Manuals (Read 2215 times)

Olpeddler KCA Forum Member Offline Krag Enthusiast! Posts: 14 Joined: Nov 16^th, 2019	Pressure - Reloading Manuals Dec 21^st, 2019 at 1:12pm	Print Post
	Which, if any, reloading manuals include pressure data for all loads listed? Thanks


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Capt. Frank KCA Forum Member Offline Krag Enthusiast! Posts: 153 Location: Dover, Delaware Joined: Jun 13^th, 2018 Gender:	Re: Pressure - Reloading Manuals Reply #1 - Dec 21^st, 2019 at 3:34pm	Print Post
	I have six, all only list min and max loads.


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Olpeddler KCA Forum Member Offline Krag Enthusiast! Posts: 14 Joined: Nov 16^th, 2019	Re: Pressure - Reloading Manuals Reply #2 - Dec 21^st, 2019 at 4:57pm	Print Post
	Cap'n, thanks for confirming what I have been seeing. I had a Lee manual published in the late 1990's and it did include CUP pressure data for each load it listed. A couple of years ago I spilled a half bottle of Hoppe's #9 onto it and had to trashcan it. I will call Lee's office on Monday to see if their current manual lists psi data. Normally, I'm OK with only minimum and max. data, but now that I have a Model 1899 carbine, I am really sensitive to the 40,000 psi limit for .30-40 Krag loadings. At my age, I don't want to blow myself up.


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waterman KCA Forum Member Offline Krag Enthusiast! Posts: 166 Joined: Oct 7^th, 2011	Re: Pressure - Reloading Manuals Reply #3 - Dec 24^th, 2019 at 5:16am	Print Post
	Mike Petrov proved that you are not going to blow up your Krag, but it is pretty easy to crack the bolt at the lug. That's why you need to be careful.


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madsenshooter KCA Forum Member Offline Krag Enthusiast! Posts: 1079 Joined: Sep 10^th, 2009	Re: Pressure - Reloading Manuals Reply #4 - Dec 24^th, 2019 at 7:00pm	Print Post
	Sure miss Petrov, though I didn't know him personally. His posts have been a rich source of information on a Noske scope I have and a.22 Hornet Winchester falling block with Niedner barrel that a friend has.


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KWK KCA Forum Member Offline Posts: 25 Location: Illinois Joined: Jul 31^st, 2017	Re: Pressure - Reloading Manuals Reply #5 - Dec 31^st, 2019 at 8:17pm	Print Post
	Lyman has the only modern pressure tested data I can find, for 3 jacketed bullet weights, 150, 180, and 220. That 220 bullet is out of production, but I don't know about the other 2 weights they tested (I haven't tried those weights). I have the 48th edition (2002), but the last time I looked at a Lyman in the stores it had the same data. Their cast bullet data has no pressure numbers. Somewhat older data (1960s I'd guess, from DuPont) is available for IMR powders and two jacketed bullet weights. See the Hodgdon site; they still publish this data. Lastly, the old NRA book Handloading (1981) has some pressure data from various sources. Both the Lyman and the DuPont data are to the CUP standard for psi estimation. The NRA data is CUP, at least in part. Sharpe's old book (1930s) has pressure numbers and some other equally old load books have such data, too. This is mostly for powders now long out of production, of course. These numbers are also crusher but predate the CUP standard, I believe. There is no SAAMI standard for piezo psi sensors, so the only pressure data for it would be from handloaders using a PressureTrace or other strain gauge system. Karl
	« Last Edit: Dec 31^st, 2019 at 10:31pm by KWK »

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madsenshooter KCA Forum Member Offline Krag Enthusiast! Posts: 1079 Joined: Sep 10^th, 2009	Re: Pressure - Reloading Manuals Reply #6 - Jan 2^nd, 2020 at 4:44pm	Print Post
	Different units makes things confusing! For example Olpeddler mentions the 40,000psi limit. No, not 40,000psi, 40,000cup. According to one of the powder company's ballistic techs I was talking to one day, 40,000cup would roughly equate to 47,000psi. In ADI's data for .303 British SAAMI MAX is 45000CUP/49000PSI It's only confusing I guess, if one fails to note the different units. That .303 data by the way gives CUP start charges with ADI powders for a variety of bullet weights that are below 40000CUP. ADI's Krag data however doesn't give start charge pressure. Capacity of the two cases is very close. Many Hodgdon powders are ADI powders. (You need to *Login* to view media files and links) (You need to *Login* to view media files and links) (You need to *Login* to view media files and links)
	« Last Edit: Jan 2^nd, 2020 at 5:44pm by madsenshooter »

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Parashooter KCA Forum Member Offline Kragmudgeon Posts: 514 Location: Connecticut Joined: Feb 4^th, 2010	Re: Pressure - Reloading Manuals Reply #7 - Jan 2^nd, 2020 at 11:50pm	Print Post
	KWK wrote on Dec 31^st, 2019 at 8:17pm: . . .There is no SAAMI standard for piezo psi sensors, so the only pressure data for it would be from handloaders using a PressureTrace or other strain gauge system. . . ??? SAAMI has standardized piezo transducer method for years. They just haven't bothered establishing piezo pressures for some of the oldies, like our .30-40.


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Parashooter KCA Forum Member Offline Kragmudgeon Posts: 514 Location: Connecticut Joined: Feb 4^th, 2010	Re: Pressure - Reloading Manuals Reply #8 - Jan 3^rd, 2020 at 12:28am	Print Post
	madsenshooter wrote on Jan 2^nd, 2020 at 4:44pm: . . . According to one of the powder company's ballistic techs I was talking to one day, 40,000cup would roughly equate to 47,000psi. . . Sounds right. CIP lists their piezo "Pmax" (maximum working pressure?) for 30-40 Krag as 3250 bar, which is 47137 psi.


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