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  #16  
Old 11-05-2012, 01:47 PM
35Remington

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I have a 1377 modded out w/ Mellon bolt, and flat top piston/valve set. 18" barrel, steel breech, lightened trigger, etc.

Y'all with 1322 experience: how much more knockdown power are y'all seeing with the larger pellet?

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  #17  
Old 11-05-2012, 07:08 PM
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Quote:
Originally Posted by 35Remington View Post
I have a 1377 modded out w/ Mellon bolt, and flat top piston/valve set. 18" barrel, steel breech, lightened trigger, etc.

Y'all with 1322 experience: how much more knockdown power are y'all seeing with the larger pellet?
Nice carbine!

I sit at night (looks like you do too) and shoot rats at a barn down the road.
The 1322 seems to hit 'em with about twice the authority of my 1377. (must be because the pellets are almost twice the weight)
Tuned, with a longer barrel, the 1322 would pack a good punch with a 14.3 grain pellet I'd say.

What did you do, knock out some of the plastic on the front barrel band/sight on the 1377 to get the longer barrel through?
I'm thinking about putting a breech on and dropping a longer barrel in my 1322.
Is that a TKO muzzle break? and if so ... how do you like it?

Last edited by Fancypicker; 11-05-2012 at 07:15 PM.
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  #18  
Old 11-06-2012, 11:57 PM
fast14riot
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Knock down power is superior with the .22. It can be calculated with the following equation, resulting in ft/lbs of Energy, or fpe as its commonly referred to.

Mass of pellet(in grains) X Velocity squared (in fps) / 450240 (gravitational constant) = ft/lbs.Energy

So let's plug in some numbers and compare...

A .177 pellet typically weighs 7.6gr and the 1377 shoots roughly 600fps.

7.6gr X 600^2 / 450240

7.6gr X 360,000 / 450240

2,736,000 / 450240

6.07 ft./lbs. Energy (at the muzzle) for a 7.6gr pellet going 600 fps.


Now a .22 pellet weighing 14.3gr going 450fps

14.3 X 450^2 / 450240

14.3 X 202,500 / 450240

2,895,750 / 450240

6.43 ft./lbs. Energy at the muzzle


So not much difference with stock guns at the muzzle, but ballistics down range is where the difference is. The .22 will carry more energy down range than the .177. As soon as you start modding the potential power of a .22 you really increase the knockdown power!



-Xander

Last edited by fast14riot; 11-06-2012 at 11:58 PM. Reason: transposed numbers!
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  #19  
Old 11-08-2012, 09:01 PM
35Remington

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Thanks for your informative post. I understand how to calculate FPE, and was able to follow you all the way to the point at which you said that downrange energy would be significantly different. How is that calculated?
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  #20  
Old 11-09-2012, 02:42 AM
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Same way, you just need to know your velocities at given distances. Think of a .177 like throwing a feather, it can go really, really fast, but not for very long.


-Xander
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  #21  
Old 11-09-2012, 09:21 AM
35Remington

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Originally Posted by fast14riot View Post
Same way, you just need to know your velocities at given distances. Think of a .177 like throwing a feather, it can go really, really fast, but not for very long.


-Xander
I get that much, too. Where I'm stuck is on how to measure backyard velocity. Maybe this is an argument for buying a chrony.
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  #22  
Old 11-09-2012, 05:17 PM
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Yep, so much can be learned about airguns by knowing actual velocity numbers, really helps with troubleshooting too. There is also home made ballistics gel for a less expensive alternative.


-Xander
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  #23  
Old 11-09-2012, 06:55 PM
fast14riot
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Something else to think about, air resistance increases with the cube of the pellets velocity. Double the velocity and the air resistance goes up eight times! Since energy is roughly the same, and the pellet can't give up mass, it loses velocity.


-Xander

Last edited by fast14riot; 11-09-2012 at 06:56 PM. Reason: typos!
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  #24  
Old 11-09-2012, 07:57 PM
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http://usgunowners.org/upload/showth...on-sparrowhawk

yall inspired me too!
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  #25  
Old 11-15-2012, 01:46 PM
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Hey all,
I have them both. Each one is excellent in its own right. I use my 1322 for hard headed grond squirrels. I haven't modified it at all and with 10 pumps i can dispatch a squirrel with one whot out to 15 yards or so. I did notice that it has similar power to the 1377 but as mentioned about its the 22 performance down range that out shines the 1377.

Having said that, my 1377 is a great tree squirrel hunter. I added the steel breech with shoulder stock and a simple 4x scope to better place my shots. Ive taken many good head shots with this carbine.

Nice to see other enjoying this great performer too
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  #26  
Old 11-16-2012, 02:57 PM
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http://www.network54.com/Forum/79574...e+Day+Shipping
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  #27  
Old 11-16-2012, 03:05 PM
35Remington

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$50 jewelry piece for my $50 gun? No thanks.
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  #28  
Old 11-17-2012, 12:46 AM
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Originally Posted by 35Remington View Post
$50 jewelry piece for my $50 gun? No thanks.
too funny! i just ordered a $58 piece of jewelery, because the plastic one failed after i mounted a P.O.S gamo green dot with the intermounts. i noticed today on my 3rd trip affield that it was way loose and after tightening the screw it is crooked!

i hope the new metal will true it up!
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  #29  
Old 11-19-2012, 10:50 AM
35Remington

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Originally Posted by 2DARK2C View Post
too funny! i just ordered a $58 piece of jewelery, because the plastic one failed after i mounted a P.O.S gamo green dot with the intermounts. i noticed today on my 3rd trip affield that it was way loose and after tightening the screw it is crooked!

i hope the new metal will true it up!
Whatever floats your boat. If you want to see $50 go a long way with your gun, go to TKO22.com.
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  #30  
Old 11-19-2012, 08:09 PM
2DARK2C

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i didn't meen what you said was "too funny". i was just saying litterally minuites before i sighned on to rfc to look at this thred i ordered that exact part!

the little pumper is floating my boat. i had seen that company but nothing caught my eye. what would you recommend for my 1322. since i got the integrated band/front sight i am going to have two inches of naked barrel out front....lol

thanks
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