600 Overkill is Finally Done

[56hawk]

It's been over two years, but it's finally done. Here is the original post I made on this rifle: http://www.thehighroad.org/showthread.php?t=605965 Final specs for the rifle are a 21" barrel and 8 3/4 lbs. Test fire video is a 900 grain bullet with 160 grains of IMR 4350. Started at 140 grains and worked my way up. Haven't had a chance to chronograph it yet, but my gunsmith said that the 140 grain load he tested did 1700 fps.

 

[Arkansas Paul]

I'm looking for a deer rifle, but I'm wanting one with a little more umph behind it. I'm not sure this is adequate for whitetails.

 

[Gordon]

Beautiful LOOKING rifle,but I'll pass on a shooting one.

 

[LeonCarr]

Like Paul said...I also am looking for a rifle with a little more punch.



Just my .02,
LeonCarr

 

[silicosys4]

Recoil is stout, looks like...but not the hardest recoiling gun I've seen

 

[Stress_Test]

Add about 10 lbs of weight to that rifle and I might try it...

Btw, a 900gr bullet at 1700fps comes out to a bit over 5700 ft-lbf energy!




Been having trouble with tyrannosaurs lately?

 

[wally]

Btw, a 900gr bullet at 1700fps comes out to a bit over 5700 ft-lbf energy!

Doesn't eh 458 Weatherby magnum approach 10,000 ft-lbs of muzzle energy?

 

[Stress_Test]

I believe the .50 BMG is about 10K to 12K, don't know about the 458

 

[56hawk]

Doesn't eh 458 Weatherby magnum approach 10,000 ft-lbs of muzzle energy?

My 460 Weatherby maxes out with a 500 grain bullet at 2,600 fps for about 7,500 ft-lbs of energy.

Starting load for the 600 Overkill did 1700 fps and I've added 20 grains of powder on top of that. Hopefully I can get to the range soon and chronograph the hotter load.

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.

 

[Jaxondog]

My My My, you have too much time on your hands.

 

[WardenWolf]

You, my friend, are a masochist. What was the donor receiver from?

 

[56hawk]

What was the donor receiver from?

It's built on a CZ550 Magnum receiver.

 

[wally]

Sorry I remembered incorrectly, its the .475 A&M Magnum that approaches 10,000 ft-lbs muzzle energy. http://en.wikipedia.org/wiki/.475_A&M_Magnum 500gr at 2980 fps.

I'd always thought the .458 Weatherby was overkill enough


If you are trying to maximize the recoil impulse I suspect you are on the right track

 

[itsa pain]

Finally someone has come near the power of a 5.56 in an AR

 

[Outlaw Man]

Ahh, my favorite cartridge (on paper; I've never shot one)! Good looking rifle, too.

In the words of Hannibal on the A-Team movie: "overkill, my friend, is underrated."

 

[RIATAC45]

Holy sweet Mary and Joseph, are you trying to remove arms in one swift move? What in the helicopter are you needing to kill? That my friend is awesome! Let us know how it shoots.

 

[Fremmer]

Please post a video of yourself shooting it! Cool rifle, I like the sights.

 

[stressed]

I can generate near the same recoil from my 18" SxS coachgun with a 3 1/2" slug that produces near 5000 ft lbs. Loaded hot is another story.

 

[Caliper_Mi]

Your powder charge weighs more than many guys bullets!


COOL!

 

[tyeo098]

I can't afford a new arm!



Looks neat though.

 

[jerkface11]

Are you going to hunt with it? If so what?

 

[BoilerUP]

Are you going to hunt with it? If so what?

Anything he wants.

 

[Centurian22]

Look at the dust kick up from the shock wave! Impressive on all accounts.

 

[SwampWolf]

Are you going to hunt with it? If so what?

Squirrels come to mind. You wouldn't even have to skin 'em and they'd come pre-cooked.

 

[Dr T]

Since someone just had to do it:

Working from a 8.75 lb rifle, a 900 gr bullet, 1700 fps velocity and 140 gr of powder, the calculation yields:

Recoil impulse (lbs-sec): 9.27
Recoil Velocity (fps): 34.12
Free Recoil (ft/lbs): 158.20

For perspective, the free recoil of a 375 H&H is about 35 ft/lbs.

It makes my should hurt just to think about it.

On the other hand, if a zombie mastodon takes up residence in your vicinity, you are well prepared to make the critical headshot.