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PostPosted: Mon Sep 04, 2017 1:30 pm 
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Joined: Thu Apr 27, 2017 4:38 pm
Posts: 152
Anybody else have the old 1981 to 2001 pumpmaster and get like 11" group with BB's yet get 1/4" groups with pellets at 15 yards? is it because it has a rifled barrel, if mine does, i don't know if it does, just a thought.


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PostPosted: Mon Sep 04, 2017 5:45 pm 
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Joined: Sat Jan 25, 2014 9:16 pm
Posts: 1278
Location: United States
The BB's tend to roll out the barrel and do this: http://tinyurl.com/oz22l4q
See the 20 sec mark.
You can watch the BB's do this. If you can't see them try shooting at clouds, or better yet near sundown with the sun at your back so you can see the bright reflection. Works really well for firearms.

Only a few 760's were rifled, and if you do have a rifled barrel I'd stop shooting BB's b/c they can damage it. Best to keep a rare barrel intact but up to you.


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PostPosted: Mon Sep 04, 2017 9:11 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6084
Location: P.G. B.C.
YUP!

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PostPosted: Tue Sep 05, 2017 3:58 pm 
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Joined: Thu Apr 27, 2017 4:38 pm
Posts: 152
Chevota wrote:
The BB's tend to roll out the barrel and do this: http://tinyurl.com/oz22l4q
See the 20 sec mark.
You can watch the BB's do this. If you can't see them try shooting at clouds, or better yet near sundown with the sun at your back so you can see the bright reflection. Works really well for firearms.

Only a few 760's were rifled, and if you do have a rifled barrel I'd stop shooting BB's b/c they can damage it. Best to keep a rare barrel intact but up to you.


I thought it may have a rifled barrel, but i checked but it's smooth bore... any ideas why it's bad with BB's?


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PostPosted: Wed Sep 06, 2017 1:16 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6084
Location: P.G. B.C.
BB's are smaller than the bore. The BB cannot spin around it's point of balance as a bullet does when fired from a rifled barrel, thus the BB is unstable. While in the barrel, it takes on a spin like a base-ball thrown as a curve, hook, slider or even a knuckle-ball if there is no spin at all - or a combination of any of these. All of these 'traits' cause the ball or BB to not hit where it is pointed. Only a properly spin stabilized ball or bullet will hit where it is pointed.

I would like to witness those 1/4" 15 yard groups fired with pellets from a smooth bored air gun.

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