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04-08-2022, 08:51 PM | #23 | ||||||
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I was just reading a thread on another forum where someone managed to get 14k psi with their normal load because they had over compressed the load, perhaps that could have happened in this case?
You want to see something sketchy look at primer swapping using a Fed 209A I think it was . |
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04-09-2022, 07:53 AM | #24 | ||||||
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Here are the testing data sheets on the 20 gauge loads in question that had pressures roughly 3500 psi higher with Cheddite primers than the same loading using Win 209 primers. They also increased velocity by about 100 fps.
For reference Alliant data for Win209 primer is: The first load with a Win 209 and 15.7 gr of 20/28 is listed on the Alliant Reloading Guide as being 1200 fps and 9370 psi. The second load with a Win 209 and 16.7 gr of 20/28 is listed on the Alliant Reloading Guide as being 1250 fps and 10,490 psi.
__________________
Progress is the mortal enemy of the Outdoorsman. |
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04-09-2022, 09:34 AM | #25 | ||||||
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Will dropping the powder help with pressure ?
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04-09-2022, 10:40 AM | #26 | ||||||
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The Following 3 Users Say Thank You to Mike Koneski For Your Post: |
04-09-2022, 11:36 AM | #27 | ||||||
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Unless you test the undocumented load, you have no idea of what the pressures are. Pending the results from Precision Reloading, I will reduce my powder charge until I get acceptable pressures. I will take whatever velocity I get. Billy
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04-09-2022, 12:46 PM | #28 | ||||||
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Identical loads, one in once fired Cheddite hulls primed with Fioche 616, one in new, primed Cheddite hulls. Unfortunately I cannot say which Cheddite primers were in the hulls as I bought them that way. Spit for difference.
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04-09-2022, 01:44 PM | #29 | ||||||
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Got curious and dug out examples of a number of different gauge, new, primed, factory Cheddite hulls. 20 ga. paper and plastic, 16 ga. plastic, 12 ga. plastic, 12 ga. paper (no pic), 10 ga. plastic. I find a variety of sealer colors on the primers (no clue if that means something) and the 20 paper appears to have no sealer. All except the 20 paper have copper color primer bodies, the 20 paper is brass colored. Referring to Kevin's info, this would indicate all have the same primer but the paper 20.
In loading various "tries" that I had tested the 20 paper ran considerably higher pressure than identical loads in plastic with what I know to be Cheddite 2000 primers. Now, is this primer difference or case volume? As I haven't accurately measures case volume plastic vs. paper, can't say. That's on my "to do" list. |
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04-10-2022, 12:04 PM | #30 | |||||||
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Quote:
As stated crimp depth can make a big difference also. |
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