And another one:
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wow this is scary, glad all is well, I'll keep this in mind if I ever shoot one of these... (I probably just shouldn't).
+1. Until you get the hang of them, load 1 and make sure you have a nice, firm grip. Also...don't start with one of EC's 1/10 lb .500 rounds...No need to be scare off by these video. Man up, line up and get your chance to get a taste of this beast. I did that (with some help)
I'll throw myself out at the mercy of NES for a critique. I had almost zero follow through. These are factory 460 Magnum loads.
I had my left leg back a bit but I wasn't leaning into the gun enough.
If you see what the OP says, the rounds his son was firing were 700 grains. I am betting they were not factory loads.
ok, so a gun with the capability of firing twice if someone doesnt grip it correctly is on "the list", but i cant go out and buy a glock?
further proof the list has nothing to do with safety
All these guys double tapping on indoor ranges are very lucky they did not kill themselves or bystanders. Ranges are designed for certain angles of shooting. Shooting a .500 hot load into a ceiling that was not designed for it can easily bounce the slug right back at the shooter, or in some other random direciton. There is no guarantee the bullet will continue on away from the shooter.
not to mention that some of these ranges are in basements of club houses... I would imagine a bullet with that kind of energy could go through to the people above... or am I way off on that thought?
No need to be scare off by these video. Man up, line up and get your chance to get a taste of this beast. I did that (with some help)
Glad everyone is ok.
For those who are still wondering how, here is a short video. Watch the frame recoil in the grip. The shooter thinks he is holding the trigger back.
It's physics. The momentum (mass times velocity) of the gas through the comp is what offsets the recoil. The mass of the powder charge doesn't change even when it burns. If you have a 10 grain charge, it changes from 10 grains of solid to 10 grains of gas when it burns. The greater the charge-to-bullet weight ratio, the more effective the comp. For example, if you have a comp on a 7mm Mag with a bullet weight of 100gr and a charge of 75gr, the comp will be very effective. If you're shooting a .500 with a bullet weight of 700gr and a charge weight of 25gr, then it's not so effective.
Can someone help me with the physics? I know I'm missing something but I don't know what.
Yes, the momentum of the gas through the comp offsets the recoil. Assume two loads (numbers chosen for roundness, not real world relevance):
10 grains of powder and a 20 gr bullet
10 grains of powder and a 40 gr bullet
Each round has the same powder charge so the m part of E=0.5 * m * v^2 is constant. That leaves velocity. And velocity of the gas will be determined by the pressure. My understanding is that the pressure behind the 40 gr bullet will be higher, because it'll take longer to get out of the way of the expanding gas, so there will be slightly more time for the pressure to rise as the powder burns.
How is a heavier bullet weight going to decrease the effectiveness of the comp? Shouldn't the velocity and thus the down-force generated via the comp be higher with a heavier bullet and the same powder charge?
Thank you kindly.
Signed,
the befuddled biologist.
Each round has the same powder charge so the m part of E=0.5 * m * v^2 is constant.
My understanding of it is this.
With the 700 grain bullet you don't use the same volume of powder. So you have less powder and therefore gas volume. But this is not a problem ballistically as the larger, heavier bullet increases the gas pressure (because it's heavier and has more friction with the barrel) so you still get a significant amount of oomph out of the barrel for the larger bullet even with less gas and powder. The comp requires gas volume to work well and not just gas pressure.
The comp requires gas volume to work well and not just gas pressure.
The greater the charge-to-bullet weight ratio, the more effective the comp.
Like I said, I'm missing something...Why, as Jim says, do comps work better with high charge to bullet ratios (i.e. lower energies)? Are the comps particularly sensitive to the mass of the gas? Why? Does it have something to do with the temporal aspect of things?
I'm missing something here. Does it really need volume? Or does it need mass? And if E= 0.5(m)(v^2), increasing the velocity/pressure of the gas by going for a heavier bullet with less powder but higher pressure, the increase in pressure would more than compensate for the loss of mass. Right?