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Apr 26th, 2024
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Joined: Dec 2023
Posts: 8
Boxlock
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OP
Boxlock
Joined: Dec 2023
Posts: 8 |
Mike,
Does the Dixon book have dimensions for the 10.75x75R Collath? or very similar?
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Joined: Jul 2012
Posts: 4,463 Likes: 207
Sidelock
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Sidelock
Joined: Jul 2012
Posts: 4,463 Likes: 207 |
Tim,
The 10.75x65R Collath is shown on page 72 in Dixon. The dimensions listed are: bullet diameter 10.56mm, case length 65.0mm, rim diameter 13.20mm, base diameter11.90mm, neck diameter 11.18mm. Cartridge listed from about 1900 to about 1905.
The discussion of this cartridge on page 73 says it appears to be a slightly necked version of the 11.2x65R Collath, which has the same dimensions as the 10.75, except the bullet diameter is 11.20mm, the case length is 64.85mm, and the neck diameter is 11.80mm. The 11.20 was available from about 1900 to about 1915. The discussion of the 11.2 on page 73 says it appears to be interchangeable with the 11.15x65R LK Express. If you check the rim recess and it indicates a significantly thicker rim than similar cartridges let me know and I will check another possibility.
Mike
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Joined: Jan 2024
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Boxlock
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Boxlock
Joined: Jan 2024
Posts: 1 |
I recently purchased; I believe to be a French 16-gauge sxs gun. I've done a little research and noticed on the barrel flats there is no "65" marked. Does this mean it would not be a 2 1/2 shot shell size? I've been shooting 2 1/2 RST but would like to shoot some Boss 2 9/16 bismuth for hunting grouse on federal/state land.
thanks for any help on this.
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Joined: Oct 2009
Posts: 6,486 Likes: 393
Sidelock
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Sidelock
Joined: Oct 2009
Posts: 6,486 Likes: 393 |
I recently purchased; I believe to be a French 16-gauge sxs gun. I've done a little research and noticed on the barrel flats there is no "65" marked. Does this mean it would not be a 2 1/2 shot shell size? I've been shooting 2 1/2 RST but would like to shoot some Boss 2 9/16 bismuth for hunting grouse on federal/state land.
thanks for any help on this. If you have a 2 1/2" chamber, you would be just fine shooting 2 9/16" shells out of it. The 1/16th extra won't make a big difference to the pressures generated. Just make sure the loads you are shooting are suitable for the age and condition of your gun.
The world cries out for such: he is needed & needed badly- the man who can carry a message to Garcia
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Joined: Jul 2012
Posts: 4,463 Likes: 207
Sidelock
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Sidelock
Joined: Jul 2012
Posts: 4,463 Likes: 207 |
Savysplace,
There are others here more familiar with French proof laws, than I. By the German proof law, a normal chamber would be designated by a 16 in a circle. A nonstandard chamber ( ie. 2 3/4" or 3.00") would need the chamber length added. When the normal chamber is designated, there is no need for a 65, since it is understood. I suspect the French law is the same, except they may use a Diamond, rather than a circle.
Mike
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Joined: Dec 2023
Posts: 8
Boxlock
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OP
Boxlock
Joined: Dec 2023
Posts: 8 |
Mike,
Sorry for the long delay but, I think you may have found something. I finally slugged the barrel as well as re-casted the chamber to include some of the barrel. The bore is .435 or 11.15mm. The rim is 13.36mm, base is 12.28mm, neck is 11.86mm. There is a slight ridge in the chamber that would allow a case length of 68.90mm. The length of chamber to lands is 71.84mm. Just beyond the slight ridge at 68.90mm is a smooth portion approximately 3mm long with diameter of 11.3mm. Could be slight neck. With digital calipers the bore reading would vary from 11.1mm to 11.2mm with 11.15mm being the most consistent reading. I got the same reading on the slugged ball as on the cast of the barrel. All other readings should be really close but, I do understand there may be some slight variations. Any further help is much appreciated.
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Joined: Jul 2012
Posts: 4,463 Likes: 207
Sidelock
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Sidelock
Joined: Jul 2012
Posts: 4,463 Likes: 207 |
Tim,
After studying your dimensions, I believe the most likely cartridge is the 11.15x65R LK express, considering that the chamber will be larger than the cartridge, and that the LK express was very popular. Two other possibilities are 11x65 Collath and 11.15 Stahl Express. While both these have a bullet diameter slightly larger than the dimension given for the "slug", it seems that both were available with the Tesco express style bullet. This is the style bullet used in 9.3x72R and 8,15x46R ammo because it can be used in barrels of varying diameters without unduly raising pressure.
Mike
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Joined: Dec 2023
Posts: 8
Boxlock
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OP
Boxlock
Joined: Dec 2023
Posts: 8 |
Mike,
Thank you for all the trouble. I have to ask where is the best place to obtain information on and to study this style bullet as I will likely have to make my own mold and alter the bullets to work?
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Joined: Jul 2012
Posts: 4,463 Likes: 207
Sidelock
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Sidelock
Joined: Jul 2012
Posts: 4,463 Likes: 207 |
The Tesco type Epress bullet was a jacketed bullet that was/is available for 9.3x72R and 8.15x46R, but I don't believe it is any longer available in the diameter you need. I believe you would be best served by a cast bullet weighing from 235-255 grains with a shank about .002" over groove diameter and a blunt nose section of bore(not groove or bullet) diameter to half a thousandth inch less. These are general dimensions, and any custom mold maker will be happy to help you work out the specifics.
Mike
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