quote:

Originally posted by Macifej:
Is that a Ten bore rifle that shoots a solid or a glorified Ten Bore shotgun with a dab of Blue Dot in the can? Besides, the powder is all the same price anyway - what's the point?. This idea is like trying to invent a square wheel!

quote:

Originally posted by Macifej:
How might I read something published 12 years ago? I don't have a personal library of that stuff.

Hey what finally happened with the old Steyr Bolt Gun?

quote:

Posted by CMcDermott
The proper powder to use for a cartridge depends on the expansion ratio (volume of cartridge versus the bore size i.e. how much the total volume behind the bullet changes as the bullet goes down the barrel) and on the maximum pressure desired for the load. Pistol cartridges have a small volume that rapidly gets bigger as they typically have short straight sided cases and light bullets that can be accelerated quickly; so they need a fairly fast burning powder to build pressure quickly. Most rifle cartridges have MUCH more case volume, a smaller bore size yet heavier bullets that don't accelerate as fast so must use a slower burning powder to limit peak pressure. Note that a 10 bore rifle cartridge looks like a scaled up pistol cartridge, straight sided with a fairly light for caliber bullet. Yes, even a 900 grain bullet is very light for a 10 bore, scale up the 300 grain .375" bullet to .775" and you get a 2400+ grain bullet. Along with the burning rate you need to consider the desired pressure levels, some powders are designed such that they need high pressures in order to burn properly and completely, others are designed to burn at lower pressures and get erratic at higher pressure levels.

quote:

Originally posted by keithv35:

quote:

Posted by CMcDermott
The proper powder to use for a cartridge depends on the expansion ratio (volume of cartridge versus the bore size i.e. how much the total volume behind the bullet changes as the bullet goes down the barrel) and on the maximum pressure desired for the load. Pistol cartridges have a small volume that rapidly gets bigger as they typically have short straight sided cases and light bullets that can be accelerated quickly; so they need a fairly fast burning powder to build pressure quickly. Most rifle cartridges have MUCH more case volume, a smaller bore size yet heavier bullets that don't accelerate as fast so must use a slower burning powder to limit peak pressure. Note that a 10 bore rifle cartridge looks like a scaled up pistol cartridge, straight sided with a fairly light for caliber bullet. Yes, even a 900 grain bullet is very light for a 10 bore, scale up the 300 grain .375" bullet to .775" and you get a 2400+ grain bullet. Along with the burning rate you need to consider the desired pressure levels, some powders are designed such that they need high pressures in order to burn properly and completely, others are designed to burn at lower pressures and get erratic at higher pressure levels.

Now that's got to be one of the most intelligent responses I've ever read on here. Kinda like using the big crayons to draw the big picture here for me.

Thanks,
Keith

quote:

It depends more on case volume than on action strength. Large volume cases require a slow burning powder to be able to achieve a long pressure curve. This provides accelerating force all the way to the muzzle.

Pistol powders burn much faster, and an amount capable of achieving good velocities will result in a huge breach pressure that will shatter any steel gun.