600 Overkill is Finally Done

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Let's have some nerd physics fun!

Foot-pounds force (ft-lbf) is a measure of energy.

One form of energy is "potential energy". This can be expressed by:

PE = (mass)*(gravity)*(height) or PE=mgh

In english units, things can get weird when doing calcs but F=ma, then mg=F which equals to "weight" in pounds-force.

In other words, you could just say PE=weight*height

so lbf*ft = ft-lbf.

This can give you a better concept of how much energy 158 ft-lbf of recoil is.

If the rifle is about 9 lbf, then the impact to your shoulder is about the same as dropping that rifle onto your shoulder from 17.5 feet high.

Got a 15 lb hand weight? Drop it from about 10.5 feet up and watch it impact the dirt. That's about 158 ft-lbf of energy. Imagine that hitting you in the shoulder. You can see why the shooter gets rocked in the video above.

DISCLAIMER: IF I'VE MADE ANY HORRIBLY STUPID ERRORS IN ANY OF THE ABOVE, I BLAME IT ON FACT THAT I JUST GOT OVER THE FLU AND HIGH FEVER IS KNOWN TO CAUSE BRAIN DAMAGE! :) :uhoh: :scrutiny:
 
So say a 700 grain bullet for plinking :what: no thanks I'd like to see a recovered bullet though
 
Shot it over the chronograph today. A 900 grain bullet with 160 grains of IMR-4350 did 2,035fps for 8,275 ft-lbs of energy. So out of a 8.75 lb rifle that's 242 ft-lbs of recoil energy.
 
Shot it over the chronograph today. A 900 grain bullet with 160 grains of IMR-4350 did 2,035fps for 8,275 ft-lbs of energy. So out of a 8.75 lb rifle that's 242 ft-lbs of recoil energy.
Click to expand...

Ouch!

AtomicCannonmushroomcloud_zpsf5505014.jpg
 
Took my brother and his friend shooting today. His friend didn't get a tight enough grip:



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Peashooter.........

(seriously, though, nice rifle!)

The other thing to think about is that the recoil energy of a max load for the 460 Weatherby is 110 ft-lbs. Starting load for the 600 Overkill is 160 ft-lbs.
Click to expand...

Recoil velocity matters, though. A .416 Rigby generates very nearly the same free recoil energy as my .375 Ultra, but at significantly lower velocity (17 FPS vs 26 FPS, if memory serves) due to it launching a heavier pill at lower velocity (and lower operating pressure). As such, the felt recoil of the .375 Ultra is quite a bit nastier.

Not saying the .600 OK doesn't hurt more than a .460 Weatherby (bettin' it does), just that the disparity may not be quite so much as the energy figures suggest.
 
I used to love to shoot my .375 H&H (with about half the felt recoil) but discovered after a handful of rounds that shooting it off the bench for load development just became painful. Offhand on game I never noticed it, but off the bench was too much after a while.
 
Am I the first to question whether this would fall under the "destructive device" section of the NFA restricted weapons? Supposedly, anything rifled over .50 (.510) caliber is regulated and needs approval and a $200 tax stamp. Did anyone check with BATF before making it?
 
It doesn't have a sporting exemption unless it is specifically named - or so I thought. Besides, 158+ ft/lbs of recoil will do more than detach a retina or dislocate a shoulder
 
I'm not gonna make a post about something even bigger or badder. It's pointless. Besides, we don't have it so we're just bragging for someone else. Again, pointless. You own it, you built it, it's your gun. And I can only imagine what that thing must be like to shoot. However, if that is going to be a "Dangerous Game" hunting rifle, I would suggest something like porting or a brake to reduce muzzle flip. I'm sure your friend knew what he was shooting and had a good grip on the gun. And he still lost control. In a dangerous game situation that could be fatal. You may not ever need one, but you NEED THE ABILITY for follow up shots. Still, an absolutely awesome rifle. What is the cost per round if you don't mind me asking?
 
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