christcorp
Member
This isn't a reloading type question, so I didn't want it in the reloading section. I am an engineer and gun enthusiast. Love math and am very good at it. But for the life of me, here's something I don't understand and was wondering if someone who validate or justify the numbers.
9mm Makarov 95 grain FMJ Brown Bear Ammunition: Muzzle Vel - 1000fps: Muzzle Energy - 210 ft/lbs (No problem, I can deal with this)
9mm Makarov 94 grain FMJ Silver Bear Ammunition: Muzzle Vel - 1000fps: Muzzle Energy - 204 ft/lbs (No problem, I can deal with this. It's 1 grain lighter bullet, so the muzzle energy would be slightly less than the 95 grain)
We're good so far. Here's the kicker:
9mm Makarov 94 grain HP Silver Bear Ammunition: Muzzle Vel - 1000fps: Muzzle Energy - 255 ft/lbs (This is the one I have a problem with. Mathematically, the same velocity and mass of the bullet, should create the same exact amount of energy. Especially at the muzzle where things like HP and FMJ really shouldn't come into play. Unless the HP comes into play even at the muzzle)
So that is my question. Why do they show 2 bullets; same weight; same velocity; at the muzzle; having significantly DIFFERENT levels of energy. If you'd like to see where I am reading it, it's at sportsmansguide.com . Just look at the available 9x18 ammo. I use Silver Bear FMJ all the time. It works great. I normally have at least 1 box of Hornady HP for Self Defense. But I was curious about the Silver Bear HP ammunition. I don't want to talk about what expands and what doesn't. We can leave that for another thread. For now, is there a formula or something I am missing that would show 2 bullets; FMJ and HP at the exact same weight and velocity at the muzzle, having the HP with a significantly more amount of energy? thanks...
9mm Makarov 95 grain FMJ Brown Bear Ammunition: Muzzle Vel - 1000fps: Muzzle Energy - 210 ft/lbs (No problem, I can deal with this)
9mm Makarov 94 grain FMJ Silver Bear Ammunition: Muzzle Vel - 1000fps: Muzzle Energy - 204 ft/lbs (No problem, I can deal with this. It's 1 grain lighter bullet, so the muzzle energy would be slightly less than the 95 grain)
We're good so far. Here's the kicker:
9mm Makarov 94 grain HP Silver Bear Ammunition: Muzzle Vel - 1000fps: Muzzle Energy - 255 ft/lbs (This is the one I have a problem with. Mathematically, the same velocity and mass of the bullet, should create the same exact amount of energy. Especially at the muzzle where things like HP and FMJ really shouldn't come into play. Unless the HP comes into play even at the muzzle)
So that is my question. Why do they show 2 bullets; same weight; same velocity; at the muzzle; having significantly DIFFERENT levels of energy. If you'd like to see where I am reading it, it's at sportsmansguide.com . Just look at the available 9x18 ammo. I use Silver Bear FMJ all the time. It works great. I normally have at least 1 box of Hornady HP for Self Defense. But I was curious about the Silver Bear HP ammunition. I don't want to talk about what expands and what doesn't. We can leave that for another thread. For now, is there a formula or something I am missing that would show 2 bullets; FMJ and HP at the exact same weight and velocity at the muzzle, having the HP with a significantly more amount of energy? thanks...
