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Rifles, Reloading, Optics, Equipment
Gunsmithing
Chamber Dimensions
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<blockquote data-quote="Kennibear" data-source="post: 1049368" data-attributes="member: 51650"><p>Where is it written that cases have to protrude from the barrel or they will jam on firing? The Ruger #1 falling block single shots have the cases submerged in the barrel proper. My #3 45/70 has the rim set into an recess in the chamber with the case absolutely flush with the barrel proper. Remington sold their rifles based on "three rings of steel" surrounding the cartridge head - even on the 742 semi-auto. Unsupported case heads have always been a negative in action design. I would say that the barrel needs to be as close to the bolt head as is possible within safe operating parameters and reliable functioning of the action. Trusting the brass case to contain the pressure without steel backing just does not make sense. Even modern handguns tout their "fully supported chambers". Blow out a few 45ACP cases in a 1911 with the attendant picking out brass shards from your fingers with tweezers and that should remove any thoughts of unsupported brass being a good idea!</p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 1049368, member: 51650"] Where is it written that cases have to protrude from the barrel or they will jam on firing? The Ruger #1 falling block single shots have the cases submerged in the barrel proper. My #3 45/70 has the rim set into an recess in the chamber with the case absolutely flush with the barrel proper. Remington sold their rifles based on "three rings of steel" surrounding the cartridge head - even on the 742 semi-auto. Unsupported case heads have always been a negative in action design. I would say that the barrel needs to be as close to the bolt head as is possible within safe operating parameters and reliable functioning of the action. Trusting the brass case to contain the pressure without steel backing just does not make sense. Even modern handguns tout their "fully supported chambers". Blow out a few 45ACP cases in a 1911 with the attendant picking out brass shards from your fingers with tweezers and that should remove any thoughts of unsupported brass being a good idea! KB [/QUOTE]
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