Do Equivalent Loads in a Black-Powder Cartridge Equal the Same in a Muzzle-loader?

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scotjute

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Just take the 45-70 cartridge for example. Is any better performance achieved by the BPCR shooting a 45-70-300 cartridge over a .45 Muzzle-loader shooting a 300 gr. bullett with 70 grains of black-powder assuming rifle barrells are same length?
 
I would say that it should be relatively close in performance but there are a lot a variables that has to be taken into account.

Compression of the powder charge.
Barrel bore dimentions & condition.
Projectile type.
Primers.

I know with a BP catridge, even the old balloon head catridges would have to be charged with a drop tube to get the full 70 grains into it then the projectile was pressed into the catridge to a point then a slight crimp placed onto the case mouth to keep the projectile in place.
With a muzzle loader it is all dependent on the shooter to put the compression on to the charge with the projectile & then do it consistently each loading.

Bore dimentions is simple, if the bore is tighter to the projectile it will increase the pressure & in turn velocity till the projectile is out of the barrel.

Both projectiles would have to be as identicle as possible to get a reliable equal reading between the two firerms.

Lastly the primer on the muzzle loader will be more than likely weaker than one found in a catridge today.
 
No. When one loads into a percussion rifle or flintlock, there is gas that escapes thould the back of the rifle, the flintlock a little more than does a percussion. in a cartridge, all the gas goes out the end of the barrel, creating more pressure.

If your dog thinks you are the best, do not go looking for second opinions.

Keep you powder dry,
David
 
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