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Air Gun Home Forum Index » BB Guns » BB's and the Crossman 760
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BB's and the Crossman 760 
PostPosted: Tue Mar 19, 2013 6:37 pm Reply with quote
CENTURION
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I was about to give up on accurately shooting bb's out of this gun, then I experimented with pump pressure. Anything above 4 pumps resulted in knuckle balls or curve balls, at 35-40 ft. 3-4 pumps is the sweet spot, at that level with open sights, I can hit 1.5 in. circles 100%. Makes it a lot more enjoyable and easy on the arms. I like racking bb's thru this thing consecutively.
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PostPosted: Tue Mar 19, 2013 6:44 pm Reply with quote
radar
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I'm thinking if it would be possible to put a hop-up on a smoothbore like airsoft guns have to cancel out left and right curves.

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PostPosted: Tue Mar 19, 2013 8:26 pm Reply with quote
whm1974
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3 to 4 pumps sounds about right. That's how I did it when I shot mine in the basement.
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PostPosted: Wed Mar 20, 2013 11:01 am Reply with quote
Robw
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Have you tried it with pellets yet? Your accuracy should be much better at
maximum pumps, or any number of pumps, with a much more stable
projectile.

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PostPosted: Wed Mar 20, 2013 3:37 pm Reply with quote
CENTURION
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Robw wrote:
Have you tried it with pellets yet? Your accuracy should be much better at
maximum pumps, or any number of pumps, with a much more stable
projectile.


Good pellets shoot fine, not pinpoint like some other guns but good enough. What is the "Hop Up" airsoft shooters use?
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PostPosted: Wed Mar 20, 2013 4:57 pm Reply with quote
Robw
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It adds a spin to the projectile to gyroscopically stabilize it.

Like when you throw a football with a spin to it to make it fly straighter.

You might also want to try re-crowning your barrel. I have seen that
alone make a huge difference in 760s before.

It has a rifled barrel (at least mine does) so I would suggest that you feed
it soft lead pellets instead of rifling destroying hard steel BBs.

One last note. BBs are way more accurate in a smooth bore than in
a rifled barrel. So much so that I made a smooth bore barrel for the
13XX that I am building. It really tightened it's groups up considerably
at 20 yards.

13XX with 16.5 inch BB only smooth bore barrel.



Last edited by Robw on Wed Mar 20, 2013 8:11 pm; edited 2 times in total

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PostPosted: Wed Mar 20, 2013 7:45 pm Reply with quote
radar
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Yep, but the ball spins backward with the front side going up. There is something that puts drag on the top of the ball in or near the breech...or possibly the muzzle in some cases(?) Make the balls fly flatter because it a curve ball curving up as gravity tries to pull it down.

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BB's and the Crossman 760 
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