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12-11-2018, 02:03 PM | #13 | ||||||
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Todd's comment about tapering the junction from the forcing cone to the bore got me thinking. Tapering the junction from the forcing cone to the bore is actually "lengthening the forcing cone". By the way, how much encroachment into the forcing cone is experienced in the first 1/4 inch of the forcing cone? I would rather have the extra metal than 150 psi less pressure.
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The Following 7 Users Say Thank You to Bill Murphy For Your Post: |
12-11-2018, 02:55 PM | #14 | ||||||
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In the early issues of Double Gun Journal (I'm going on memory here friends) John Brindle wrote some articles titled "Nitro for Black". His conclusion was that if you stay at or under 8,000 psi you are good to go with modern powders.
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The Following 2 Users Say Thank You to Harry Collins For Your Post: |
12-11-2018, 03:03 PM | #15 | ||||||
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The VH that Sherman Bell blew up Took some 31,400 psi before it let go at the breech where the extractor pin and the dolls head screw almost connect. If I recall correctly I had those forcing cones lengthened. I know I wanted it done, but I can't recall it the gunsmith talked me out of it or not. Today I will not change chokes, mess with the chambers or forcing cones on a Parker.
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The Following 6 Users Say Thank You to Harry Collins For Your Post: |
12-12-2018, 10:10 AM | #16 | |||||||
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Quote:
The gun is a 6 lb 5 oz 12 gauge, with 30" bbls, that came with 2 1/2" chambers. Lengthening the forcing cones lowers the pressure, without weakening the chamber area. |
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12-12-2018, 10:34 AM | #17 | ||||||
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So you make the walls of the chamber thinner but it does not make the walls weaker?
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The Following User Says Thank You to Bruce Day For Your Post: |
12-12-2018, 11:21 AM | #18 | ||||||
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Would lengthened chambers void the proof?
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12-12-2018, 03:46 PM | #19 | ||||||
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Thanks for that question Bruce. Lengthening the forcing cones without weakening the chamber area defies the laws of physics big time.
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The Following User Says Thank You to Richard Flanders For Your Post: |
12-12-2018, 07:46 PM | #20 | ||||||
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Here is a Parker published loading table showing drams in black powder. Just substitute drams black to drams equivalent in smokeless. Unless you have hogged out barrels or wrecked stocks.
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