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< 16ga. Ammunition & Reloading ~ Shell reducers |
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Posted:
Tue Sep 29, 2009 5:39 am
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Joined: 06 Sep 2007
Posts: 154
Location: Kentucky
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Asked this question as a response to another thread but didn't get any answer so I'll try again here. Do any of you know of any literature showing the effect on chamber pressures of using shell reducers such as chambermates ? I would think that given the lose seal of shooting a 20 ga shell in a 12ga borre the pressure would be reduced significantly. Thanks |
_________________ The chance to act magnamously toward others often lasts but an instant, the chance for regret lasts forever. |
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Posted:
Tue Sep 29, 2009 5:54 am
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Joined: 06 Aug 2009
Posts: 960
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The chambers of any tube set (Chambermates included), are made to SAAMI guidelines. There will be no significant difference in chamber pressure between a shotgun with a tube set installed or a shotgun with no tubes. The design of the tube set either loose or tight in a specific barrel(s) also has no real affect on chamber pressure of a certain cartridge.
The peak chamber pressure is created within the first inch or so of travel of the ejecta. While pressure and velocity are affected once the ejecta has cleared the Chambermate, that initial pressure spike still happens.
I hope this helps. |
_________________ Mark |
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Posted:
Tue Sep 29, 2009 10:10 am
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Joined: 06 Sep 2007
Posts: 154
Location: Kentucky
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Thanks, I kind of figured the actual chamber presure would be the same but as far as barrel pressure I wonder how much impact that has . While I am not advocating this would using a steel reducer and firing a 20 ga shell in a 12 ga damascus barrel contain the chamber pressure via the steel reducer and reduce the barrel pressure to a point where the gun could be used w/o splitting/damaging the barrel. |
_________________ The chance to act magnamously toward others often lasts but an instant, the chance for regret lasts forever. |
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Posted:
Tue Sep 29, 2009 10:35 am
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Joined: 06 Aug 2009
Posts: 960
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For the actual barrel pressures, maybe some of the more mathematically gifted members could help you with that. You have to be able to calculate expansion ratios of the various powders and then figure the addition volume of the barrel.
I don't have a clue on how to figure that out. |
_________________ Mark |
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Posted:
Thu Oct 01, 2009 12:46 am
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Joined: 12 Sep 2009
Posts: 74
Location: las vegas NV
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Posted:
Thu Oct 01, 2009 6:14 am
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Joined: 06 Aug 2009
Posts: 960
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Nice link,
I am not much for strain gauge readings without reference loads, but in this case, that is probably as close as you can get, to the real numbers. They seem in the ballpark. |
_________________ Mark |
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