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< 16ga. Ammunition & Reloading ~ How low is low pressure? |
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Posted:
Fri Mar 18, 2016 5:41 pm
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Member
Joined: 24 Feb 2006
Posts: 45
Location: EASTERN NEBRASKA
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Most of my reloads are in the 8500 to 8800 psi with either 1 oz or seven eighth
oz shot loads. Is this a low pressure load?
Glenn |
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Posted:
Fri Mar 18, 2016 6:45 pm
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Member
Joined: 15 Apr 2007
Posts: 9464
Location: Amarillo, Texas
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Winchester hull
Gauge: 16 Lead Shot 7/8 oz.
Manufacturer, Powder, Primer, Wad, Grs, Pressure, Vel. (ft/s)
Hodgdon, Internat'l, Rem. 209P, DR 16, 16.4, 6,200 PSI, 1,150 |
_________________
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USAF RET 1971-95 |
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Posted:
Fri Mar 18, 2016 6:52 pm
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Member
Joined: 08 Nov 2005
Posts: 3438
Location: Illinois
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I'd call it a normal,mid range load. |
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Posted:
Fri Mar 18, 2016 7:12 pm
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Member
Joined: 08 Aug 2011
Posts: 1946
Location: Central CT
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I wouldn't give that pressure range a name. It's just chamber pressure. |
Last edited by Dogchaser37 on Sat Mar 19, 2016 1:27 am; edited 1 time in total _________________ Mark |
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Posted:
Fri Mar 18, 2016 7:12 pm
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Joined: 26 Apr 2010
Posts: 3177
Location: NCWa
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It's at the lower end of "normal". For "low" you need to be 6xxx. |
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Posted:
Fri Mar 18, 2016 7:40 pm
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Joined: 15 Jun 2010
Posts: 1358
Location: Twin Cities, MN
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There is no industry standard for a "low pressure" load. I have seen loads from 4,500 to 9,500 psi all considered low pressure by someone.
Regards,
Jeff |
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Posted:
Sat Mar 19, 2016 12:18 am
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Member
Joined: 24 Feb 2006
Posts: 45
Location: EASTERN NEBRASKA
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Thanks to all I was just curious as there is a lot of discussion on the site about low pressure loads. I always use data for manufacturer mostly Hodgdon.
Glenn |
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Posted:
Sat Mar 19, 2016 6:46 am
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Joined: 07 Apr 2007
Posts: 1624
Location: northwewst Wyoming
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My best patterning 1 oz. 16 gauge hunting loads have pressures of 5780, 6440 and 7440 PSI. |
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Posted:
Sat Mar 19, 2016 12:36 pm
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Joined: 16 Nov 2006
Posts: 1338
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Last edited by mike campbell on Fri Jul 26, 2019 11:32 am; edited 1 time in total |
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Posted:
Sat Mar 19, 2016 2:34 pm
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Member
Joined: 08 Aug 2011
Posts: 1946
Location: Central CT
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Well put Mr. Campbell. I had originally posted something similar, but your way sounds a lot nicer.
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_________________ Mark |
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Posted:
Sat Mar 19, 2016 2:58 pm
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Member
Joined: 04 Mar 2008
Posts: 1943
Location: Lowcountry Ga.
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With loads and velocities equal, a higher pressure load can have lower pressures at key distances outside the chamber than a lower pressure load. In other words, lower overall pressure is not necessarlily better. Take a look at the dicussion below and study the graphical comparison and tables of an 8400 psi load compared with a 4500 psi load. It's an eye opener if you thought otherwise as I did before seeing this discussion.
The graphs are on page two of the thread.
http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=436288&page=2 |
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Posted:
Sat Mar 19, 2016 3:11 pm
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Joined: 26 Apr 2010
Posts: 3177
Location: NCWa
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I generally prefer to match the manufacturers recommendations or mindset for their products. If the owners manual says a type of oil is recommended in their engine, that's what I try to do. With regard to firearms, particularly ones are from a different time period, I would seek loads that would match those available at the time the gun was made, in the belief that the designer had those loads in mind. So the question is: what were the standard peak and "area under the curve" pressures for shotshells in the first half of last century? |
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Posted:
Sat Mar 19, 2016 10:12 pm
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Member
Joined: 08 Aug 2011
Posts: 1946
Location: Central CT
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SAAMI officially started with standards in 1926, using the lead crusher system for shotshell testing........you would be hard pressed to find out what the pressure curves looked like. The chamber pressures that are used today are very similar to what they were then.
The lead crusher system was used before that also.
Pressure curves are another area that mean next to nothing to most of us. They sound cool to talk about but, I don't know too many that actually know what they mean. Since we have no way of controlling them.........they are what they are.
There were some test barrels made that had lots of ports for lead crushers and I remember seeing one with a bunch of transducers sticking out of the test barrel too. I suppose they were made to 'see' the whole event.
Pressure curves are for guys developing powder and maybe primers.
If you have ever seen a pressure curve they all pretty much look alike. I would assume they need to be very similar, as it seems that barrel time is a critical part of internal ballistics.
Shot shells are very old technology. There isn't much new when you really get down to it. The limitation is and will always be trying to throw little out of round spheres that have crappy aerodynamics. |
_________________ Mark |
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Posted:
Sun Mar 20, 2016 8:09 am
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Member
Joined: 09 Dec 2005
Posts: 989
Location: Las Vegas
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I have a couple of OLD SxS's in 16ga. I tend to worry more about recoil effect on the wood than I do about pressure. So I tend to shoot a lot more 7/8 oz. loads than anything heavier. That being said, Mr. Campbell pretty much nailed it.
Matt |
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