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wncchester Member
Joined: Apr 08, 2006 Posts: 160
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Posted: Fri Apr 23, 2010 5:46 am Post subject: Re: Disapointed In Sierra ... |
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All manuals differ, sometimes quite a bit. Which is "right"? I suspect they all are.
If they all used the same powder lot, same bullets, primers, cases and same rifle they would likely agree pretty closely. But that isn't possible, is it?
Thus, "Start low, only move up....", etc., is the ONLY certain book rule.
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fnuser Super Member
Joined: Dec 23, 2008 Posts: 914 Location: S.W. Missouri, U.S.A.
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Posted: Fri Apr 23, 2010 7:07 am Post subject: Re: Disapointed In Sierra ... |
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Don't feel bad chambered I have one that is copywrite 1971, it doesn't say what edition it is so I suspect it is the 1st.
_________________ N.R.A. Endowment Member |
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skb2706 Member
Joined: Apr 10, 2006 Posts: 269
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Posted: Fri Apr 23, 2010 9:39 am Post subject: Re: Disapointed In Sierra ... |
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Your comparison included Lee data and Sierra data. The Lee book cost you $6 and for my money its way over priced. Full of less than useful information and data derived from their interpetation of others data. Sierra actually tests their data and offers loads of free infomation and tips just for the asking. In this case consider the source.
When it comes to loading for a SA rifle I would put function ahead of bullet speed anyday, all day.
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DallanC Site Admin
Joined: Jan 18, 2005 Posts: 3572 Location: Utah
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Posted: Fri Apr 23, 2010 11:32 am Post subject: Re: Disapointed In Sierra ... |
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Whats really frustrating is if you have books from a single MFG going over many versions, and the loads from the newer books are DRAMATICALLY different from ones in the old books.
I have a couple Hodgdon manuals like that, with a difference in over 300fps in the max load for a particular caliber. If powders are blended with the same burn rate year after year, what could possible cause such a descrepancy in the load information???
-DallanC
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TRBLSHTR Super Member
Joined: Mar 23, 2007 Posts: 1071 Location: Lower 48's-left coast(near portlandia)
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chambered221 Super Member
Joined: Aug 17, 2007 Posts: 3455 Location: Lost for good !!!
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Posted: Fri Apr 23, 2010 5:07 pm Post subject: Re: Disapointed In Sierra ... |
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Take a look at the pressure information that is sometimes available.
Using the 308 Winchester as an example; SAAMI set the limit at 52,000 CUP or 60,000 PSI.
Looking at a Hodgdon basic manual I find the 150gr. B-Tip used in conjunction with H322 only gives 50,500 CUP with a MAX charge of 40.0 gr.
I'm willing to bet you can get a lot more 322 in a 308 case. So the question becomes why limit it to only 40.0 grains.
IMO the answer comes down to the load being useful or not !!!
As you reach a loads MAX it starts to become inconsistent, sure we can run it up more and obtain a higher velocity safely but then we sacrifice the loads integrity. Most re-loaders I know will give up speed anytime they can gain consistency.
It's my opinion that the older manuals reflected this and those that obtain the data know we as re-loaders want the consistency.
Another aspect to this is how things have changed in the industry over the years.
New ways of mixing and formulating powders have actually made them more economical.
As an example talk to anyone that used Red Dot in their shotguns in the 70's. You had to use more of it and it left a lot of unburnt powder and residue in the barrel. Today it's one of the cleaner shotgun powders available.
_________________ Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!
A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.
~George Washington |
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PaulS Super Member
Joined: Feb 18, 2006 Posts: 4330 Location: South-Eastern Washington - the State
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Posted: Fri Apr 23, 2010 7:55 pm Post subject: Re: Disapointed In Sierra ... |
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The other issue - and a big one in my opinion is that - we have a better understanding of the limited information that the copper crusher system of pressure reading and have the better information of the peizo-electric system that displays the entire pressure curve.
Ballisticians have learned that some of the older information actually produced pressures that exceeded the SAMMI maximums. Loads have been adjusted accordingly.
Lawyers have little to do with powder recommendations - those powder companies know that we want total performance and safety in our loads. they also what us around to buy more powder too.
_________________ Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads |
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Pumpkinslinger Super Member
Joined: Sep 22, 2007 Posts: 5002 Location: NC foothills
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Posted: Fri Apr 23, 2010 8:11 pm Post subject: Re: Disapointed In Sierra ... |
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What PaulS said! Better equipment for measuring pressures means safer loads for us. One manufacturer (Speer?) was reshooting its suggested loads and switching all to PSI from CUP.
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
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