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reloaded ammo is not as dependable as factory ammo.
 

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For achieving top velocity you use a slower burning propellant for long barrels and faster for short. False - optimum propellant burnrate is determined by the case capacity, bullet weight and bore diameter NOT barrel length
 

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Smokeless powder (15lb. or less) kept in approved containers in your garage or in a closet, is likely to explode if the house catches on fire. False - smokeless powder doesn't explode; it burns very rapidly to produce a lot of gas when confined in a cartridge in a gun barrel. However, smokeless powder can accelerate the spread of a fire if it is stored improperly or if you store too much of it in one place in your home.
 

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For achieving top velocity you use a slower burning propellant for long barrels and faster for short. False - optimum propellant burnrate is determined by the case capacity, bullet weight and bore diameter NOT barrel length
The factors you mentioned are far more relevant than people give them credit for, but barrel length is relevant to port and muzzle pressures. Examples where this is relevant include shorter AR's where there are some powders which fit the desired gas patterns better than conventional loads, or if you have a muzzle device which works best at a certain pressure range.

Everything comes together, but as you said, case cap, bullet weight, and bore diameter are the foundation.
 

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The factors you mentioned are far more relevant than people give them credit for, but barrel length is relevant to port and muzzle pressures. Examples where this is relevant include shorter AR's where there are some powders which fit the desired gas patterns better than conventional loads, or if you have a muzzle device which works best at a certain pressure range.

Everything comes together, but as you said, case cap, bullet weight, and bore diameter are the foundation.
what you mentioned, mite as in maybe be true. but there are some exception to the rule. example a .308 caliber rifle will obtain a higher muzzle velocity with a longer barrel. ie: 28 inch barrels will have a higher muzzle velocity than a rifle with a 22 inch barrel, giving that the same powder and bullet weight is fired in both weapons. super slow propellants will give higher velocity with longer barrels. a .308 rifle will obtain higher velocity then a .308 pistol. so case capacity, bullet weight and bore diameter all have a bearing on velocity, but then with out an optimum barrel length you will never get maximum velocity out of any round you fire.
 

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what you mentioned, mite as in maybe be true. but there are some exception to the rule. example a .308 caliber rifle will obtain a higher muzzle velocity with a longer barrel. ie: 28 inch barrels will have a higher muzzle velocity than a rifle with a 22 inch barrel, giving that the same powder and bullet weight is fired in both weapons. super slow propellants will give higher velocity with longer barrels. a .308 rifle will obtain higher velocity then a .308 pistol. so case capacity, bullet weight and bore diameter all have a bearing on velocity, but then with out an optimum barrel length you will never get maximum velocity out of any round you fire.
Ratatat was discussing, at least in my interpretation of his post, the powder selection for a given cartridge, not stating that cartridges go the same speed with the same powder regardless of barrel length.

The case and bore dimensions dictate how burn dynamics relates to pressure, leading to optimum barrel length for a max load being derived from those factors. Crunching numbers on WSMs always amused me in that regard.

I personally focus more on shorter guns, but I'd imagine there's eventually limits with cartridges and slow burning powder unless you want to go to barrels far out of utilitarian range (in my opinion). Even then, there's physical ceilings and diminishing returns.
 
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