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GJ
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The .577/.450 Martini cartridge was a black powder cartridge and generated much lesser chamber pressures than the .303, which was a nitro powder cartridge of much higher chamber pressure (about 19 tons per square inch)
The Martini breech block was strong enough but the firing pin point and hole were rather large. There was a possibility that the .303 primer would rupture and gas escape into the action and injure the firer. So the firing pin point was reduced and a steel strip with a smaller hole was dovetailed across the front of the breech block. GJ |
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GJ
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Further to my previous post. you might be interested in some of Ian Skennerton's Small Arms Identification Series of booklets. SAIS No 15 is on the .450 and .303 Martini. I got mine from Jeremy Tenniswood and the 48 page booklet cost �8. In the parts diagrams on pages 32 & 34 shows the converted breech blocks.
I also have SAIS No 16, Training and Cadet Rifles ( lot on the .310 Greeners and BSA) and SAIS No 20 Enfield Musket and Snider Enfield which I also collect. GJ |
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