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Joined: Oct 2006
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Sidelock
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'Easing' the forcing cone does not affect the chambering and should sort out your problem. Lengthening the chamber will require re-proof. I also recommend trying different shells. Recently, I tested a Dickson round action for a client and forend that the case ends ragged when using Eley First, Hull High Pheasant and Eley VIP but not when using Eley Grand Prix. A lot of guns favour one cartridge over another - find what that is and stick to it.

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Sidelock
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Dig, I find that some early German built guns with 65mm. chambers have a very sharp chamber cone; almost a step, and will cause problems with some cartridges by cutting off a piece of the case mouth. I suspect that they were made for a true 65mm. paper case roll crimped cartridge which would work perfectly by unrolling right up to the length of the chamber. Something worth looking at on older guns. Lagopus.....

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Sidelock
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That is about right.

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Originally Posted By: Ted Schefelbein
Damascus,
Thanks for posting that photo. I had the identicle problem with an old American gun, and posted about it, here, but, I had no photographic evidence.

The cure for my gun was a simple lengthening of the forcing cone, NOT the chambers. The cones in that gun were rather short and were more like "steps" for lack of a better word. I did have regular posters, here, reply that they doubted what I was describing could actually happen.

Best,
Ted


Ted, Charles Fergus reported that problem, also with a cone that was more like a step, in an article on Damascus guns he did for Shooting Sportsman. His problem came with the 67MM Brit shells in a 19th century gun. Same shells in a 2 1/2" Brit gun from the 1930's: no problem. In his case, he found that true 65MM shells (don't recall that he specified a particular brand) worked OK in his 19th century gun. I believe, but can't recall for sure, that one or two others here may have reported a similar problem with very short cones.

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Sidelock
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This is often the case, British retailed shells for 2 1/2" chambers can actually be 65mm,67mm, 67.5mm. The thickness of the plastic may also be an issue.

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