paulvallandigham
Passed On
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First: I just got off the phone talking to a technical advisor at Sturm,Ruger, &C0., who assured me that Ruger at no time has ever said that using 30 grains of 4Fg powder in their ROA revolvers is SAFE, much less recommended. He then referred me to the on-line manual still availlable for those revolvers.
http://www.ruger.com/products/_manuals/oldArmy.pdf
On page 10 they discuss ammunition and recommend a beginning load of 20 GRAINS of FFFg- Not 4Fg powder in the revolver, with a filler used in front of the powder up to the base of the ball.
Now, the weakness in that revolver cylinder is NOT from the steel used, the heat treatment, and its certainly not the thickness, or "THINNESS" of the chamber walls in the Ruger Old Army. The Weakness comes from the location of the Cylinder Bolt NOTCH that locks the cylinder in place while a chamber is fired.
Those notches are DEEP- even in the heavily built Ruger revolvers. That means that there is NOT MUCH metal between the bottom of the notch, and the interior wall of each chamber. AND, those notches are cut where the chamber/cylinder walls are also the thinnest. ( NOTE: Modern Magnum revolvers are now being made- both Single Action and Double Action revolvers-- with "Off-set" cylinder bolt notches and corresponding off-set cylinder bolts.]
Even in modern cartridge revolvers I have seen dimples where the cylinder wall is a few thousandths of an inch from the bolt notch on the outside of the chambers. This, after the pressure of the cartridge is also contained in a modern Brass casing, with thick web at the base of the casing, close to where that cylinder bolt notch. That brass is rated, itself, to withstand about 55,000 PSI.
In a Cap and ball revolver, where you have no brass casing helping to contain pressure, all that pressure is pushing out against the cylinder wall, and against that cylinder bolt notch.
If a chamber is going to blow, its going to blow at that notch first. That notch is invariably located right under the Top-Strap of the frame of the revolver, which is why we see those top straps broken( at the back end of the frame, where the top strap joins the recoil shield around the hammer, and cylinder) and turned upward when one of these cylinders fails.
For those uninformed, The capability of any revolver, including the massive ROA, to withstand pressures is MUCH different than that of any percussion RIFLE barrel. What someone could get away firing in his Hawken style rifle is much different than what will happen in a revolver, for the reasons explained above. The worse thing that will happen with a percussion rifle, such as a T/C, is that the pressure will eventually strip the threads, and blow the Nipple out of the bolster.
In revolvers, the thin "wall?" between the bottom of the cylinder bolt notch will give way long before the nipple threads in each chamber will fail. The threads have more metal to them, and there are more threads than that one thin shim of metal at the bottom of the bolt notch.
I am done on this. Do what you want, but don't ever say you weren't warned. Your posting this on this forum has just become the best defense for any Insurance Company, when your family tries to sue a gun manufacturer over your untimely death, or loss of limb, or eyesight.
Have a better day. :thumbsup:
http://www.ruger.com/products/_manuals/oldArmy.pdf
On page 10 they discuss ammunition and recommend a beginning load of 20 GRAINS of FFFg- Not 4Fg powder in the revolver, with a filler used in front of the powder up to the base of the ball.
Now, the weakness in that revolver cylinder is NOT from the steel used, the heat treatment, and its certainly not the thickness, or "THINNESS" of the chamber walls in the Ruger Old Army. The Weakness comes from the location of the Cylinder Bolt NOTCH that locks the cylinder in place while a chamber is fired.
Those notches are DEEP- even in the heavily built Ruger revolvers. That means that there is NOT MUCH metal between the bottom of the notch, and the interior wall of each chamber. AND, those notches are cut where the chamber/cylinder walls are also the thinnest. ( NOTE: Modern Magnum revolvers are now being made- both Single Action and Double Action revolvers-- with "Off-set" cylinder bolt notches and corresponding off-set cylinder bolts.]
Even in modern cartridge revolvers I have seen dimples where the cylinder wall is a few thousandths of an inch from the bolt notch on the outside of the chambers. This, after the pressure of the cartridge is also contained in a modern Brass casing, with thick web at the base of the casing, close to where that cylinder bolt notch. That brass is rated, itself, to withstand about 55,000 PSI.
In a Cap and ball revolver, where you have no brass casing helping to contain pressure, all that pressure is pushing out against the cylinder wall, and against that cylinder bolt notch.
If a chamber is going to blow, its going to blow at that notch first. That notch is invariably located right under the Top-Strap of the frame of the revolver, which is why we see those top straps broken( at the back end of the frame, where the top strap joins the recoil shield around the hammer, and cylinder) and turned upward when one of these cylinders fails.
For those uninformed, The capability of any revolver, including the massive ROA, to withstand pressures is MUCH different than that of any percussion RIFLE barrel. What someone could get away firing in his Hawken style rifle is much different than what will happen in a revolver, for the reasons explained above. The worse thing that will happen with a percussion rifle, such as a T/C, is that the pressure will eventually strip the threads, and blow the Nipple out of the bolster.
In revolvers, the thin "wall?" between the bottom of the cylinder bolt notch will give way long before the nipple threads in each chamber will fail. The threads have more metal to them, and there are more threads than that one thin shim of metal at the bottom of the bolt notch.
I am done on this. Do what you want, but don't ever say you weren't warned. Your posting this on this forum has just become the best defense for any Insurance Company, when your family tries to sue a gun manufacturer over your untimely death, or loss of limb, or eyesight.
Have a better day. :thumbsup:
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