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 Post subject: Powder charge variations....
PostPosted: Fri May 07, 2004 10:28 am 
Diamond Grade
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Joined: Sun Mar 07, 2004 10:09 pm
Posts: 1078
Location: IL, CA, AZ
Are there any real issues with powder charge variations? i.e. The recipie calls for 18.2 gr. of "X" powder. When randomly measuring powder charges during a reloading cycle, they can be up or down by as much as .4 grains. Is that an issue?

Also, is it problem if you under-charge shells a little. i.e. The recipie calls for 18.2 grains of "X" powder but despite adjustments I can only get 17.8 gr +/- .2 grains. Thanks



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 Post subject: Re: Powder charge variations....
PostPosted: Fri May 07, 2004 10:36 am 
Tournament Grade
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Joined: Sun Jun 01, 2003 3:11 pm
Posts: 280
Location: Barrie Ontario
With shotgun shells it shouldn't matter.
There is no problem under loading as long as it's not too drastic.
One of the nice things about reloading is the ability to tailor loads.
I have a standard load of 17.5 grains of Promo and a 7/8 load which I reduce to 16 grains Works fine. Anything below 12 gr will sound like a squib.
You should probably weigh every 20th drop anyway to make sure you aren't having a problem.
Sometimes a string or something will get in the way and change the drop.
As well, weigh between cannisters of powder. Not all batches are consistent.

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 Post subject: Re: Powder charge variations....
PostPosted: Fri May 07, 2004 2:18 pm 
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Joined: Sat Aug 30, 2003 4:08 pm
Posts: 4268
I have been getting anywhere between 19.6 and 20.1 on my reloads. The recipe calls for 19.8.

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 Post subject: Re: Powder charge variations....
PostPosted: Fri May 07, 2004 11:40 pm 
Tournament Grade

Joined: Wed Dec 31, 2003 12:45 am
Posts: 285
clayshooter that is well within limits for reloads on shotgun shells. you will never know the difference from shell to shell.are you worried in over powder or just a consistant drop in powder?for most shooters loading a clays load they will never approach a max level .that much shooting at max loads would be killer..tony


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 Post subject: Re: Powder charge variations....
PostPosted: Sat May 08, 2004 9:59 am 
Reloading Expert
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Joined: Sun Mar 07, 2004 3:48 am
Posts: 1743
Location: Lawton, Oklahoma
Take a look at some loading data that has multiple data points. For example, the free Hodgdon Basic Reloaders Manual 2003, page 51, shows the following using International, the Win 209 primer, STS hulls, Rem Figure 8 wad, and 1-1/8 ounces shot:

17.5 grs/1090 fps/7,900 psi
18.6 grs/1145 fps/9,000 psi
19.7 grs/1200 fps/10,200 psi
20.8 grs/1255 fps/11,300 psi

If you were to plot this and use, say, the 1200 fps point, a 0.3 gr. variation around the 19.7 gr. mark would give about 1180 fps at -0.3 gr. and about 1220 fps at +0.3 gr. As for pressure, the corresponding values would be about 9,900 psi at -0.3 gr. and about 10,500 psi at +0.3 gr. In other words, one would be looking at about a +/- 20 fps variance about the nominal 1200 fps and about a +/- 300 psi variance about the nominal 10,200 psi.

Is this significant? Probably not with this particular load. It could potentially become significant, though, if one were out there on the high edge of the pressure curve. (SAAMI maximum average peak pressure for the 12 gauge 2-3/4" and 3" is 11,500 psi.) Significant not in the sense of vaporizing your shotgun, but simply adding unnecessary stress to the action and perhaps blowing the pattern.




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