Help me understand burn rate

[Tony243]

+2 on pinning. I knew that bore size vs case capacity made a difference (a few years back I had to research why .223 and .308 like similar powders). All the other info in this thread is fascinating!

 

[DFHarley19]

All pieces of information above are great! That makes me ask the next question! How that affects temperature sensitivity?

Many Thanks!

 

[MagnumManiac]

Temp sensitivity has nothing to do with burn rate other than it gets faster as temp goes up. Temp sensitivity is caused by the make-up of the powder.
The substances used to either slow or quicken the burn is what makes a powder temp sensitive.
Diphenhylamine(sic) is used as a deterrent coating on most double base powders, this causes the temp instability, as it burns first and is affected by outside conditions.

Cheers.

 

[arch408]

You could sort of correlate powder burn rate with petroleum fuels. For instance different internal combustion engines use different types of fuel. Gasoline engines burn a volatile fuel that requires a spark plug to ignite it. Racing engines also use a methanol or methanol mix fuel. You could put those two fuels engines of different types, I.E. regular gasoline in a methanol drag engine and it will burn it, but might destroy the engine. Methanol in a gasoline engine would be very inefficient but it would probably run. You can burn diesel fuel in a gasoline engine in a pinch and it will run if you can get it started. It will smoke a lot. So I've been told. HeHe. Diesel engines will run great on jet fuel. Or take coal and wood. They are both carbon and by weight, they would probabably have similar BTUs. The coal would take longer to burn and release its heat at a slower rate. Gun powder has different burn rates to make them more efficient. Fast burning powders expend their energy in a shorter ammount of time making them ideal for small cases. Slow powders are ideal for large cases allowing heavy bullets to reach high velocities.

 

[Guldenator]

So, smart people (I mean it), will IMR 4166 work well with a 165 gr. bullet for the TC 30 cartridge?

 

[jimbires]

So, smart people (I mean it), will IMR 4166 work well with a 165 gr. bullet for the TC 30 cartridge?

max load will be about 110% case fill . so it's a compressed load for sure .