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Old 07-16-2012, 08:54 PM #1
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Under-sized Pump Barrel Question

What is the benefit of having a very undersized bore on a pump?

I am reading everywhere that ".679 etc.. is great for a pump"


Is this used as a ball detent to keep from rolling out, or are pumps using smaller bore size paint for accuracy? How does it affect barrel breaks from being so small?


Excuse my ignorance

Last edited by justing66 : 07-17-2012 at 06:59 PM.
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Old 07-16-2012, 09:00 PM #2
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The reduced bore is great as a preventative for rollouts, though with the highly reduced rate of fire I have never had a barrel break with my .678 lurker, though my etek shoots out shotgun paint with that barrel. The reduce rate of fire, for me, made the underbore worth while and a great accuracy booster
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Old 07-17-2012, 08:43 AM #3
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A few things.

1) Prevents roll outs. Important when you are only shooting one shot. You want to know the ball will be there and you want to make sure that shot is consistant every time by not having the ball half way down the barrel or something.

2) Increased efficiency. Not really that big a deal with bulk air, but if you are using a small tank or 12gs then you want to squeeze as many shots out as possible. Underboring makes sure there is a good seal between the ball and the barrel and that no air/gas escapes to be wasted. This is only true to a point, if you underbore TOO much then it requires more gas to overcome the drag and actually force the ball down the barrel.

3) Consistantcy. If you use a slight underbore and you can ensure a good paint to bore match then you can make your marker as consistant as possible. This leads to accuracy in so far that if all things in the marker remain the same...then the paint should shoot the same each time...if the player can count on his/her marker being consistant then they can be accurate in their aim.



Barrel Breaks. Most paint can handle being squeezed a bit. Sometimes up to 0.005" without breaking. Of course High end paints with brittle shells probably don't want to be squeezed that much.

Your best bet is to find out what the size of your paint is and go just a tad smaller...
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Old 07-17-2012, 09:00 AM #4
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Quote:
Originally Posted by Jahdfather View Post
The reduced bore is great as a preventative for rollouts, though with the highly reduced rate of fire I have never had a barrel break with my .678 lurker, though my etek shoots out shotgun paint with that barrel. The reduce rate of fire, for me, made the underbore worth while and a great accuracy booster
This doesn't make sense. ROF has nothing to do with barrel breaks. Something else is wrong.
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Old 07-17-2012, 11:58 AM #5
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Old 07-17-2012, 02:35 PM #6
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Quote:
Originally Posted by Nahib_Stilgar View Post
A few things.

1) Prevents roll outs. Important when you are only shooting one shot. You want to know the ball will be there and you want to make sure that shot is consistant every time by not having the ball half way down the barrel or something.

2) Increased efficiency. Not really that big a deal with bulk air, but if you are using a small tank or 12gs then you want to squeeze as many shots out as possible. Underboring makes sure there is a good seal between the ball and the barrel and that no air/gas escapes to be wasted. This is only true to a point, if you underbore TOO much then it requires more gas to overcome the drag and actually force the ball down the barrel.

3) Consistantcy. If you use a slight underbore and you can ensure a good paint to bore match then you can make your marker as consistant as possible. This leads to accuracy in so far that if all things in the marker remain the same...then the paint should shoot the same each time...if the player can count on his/her marker being consistant then they can be accurate in their aim.



Barrel Breaks. Most paint can handle being squeezed a bit. Sometimes up to 0.005" without breaking. Of course High end paints with brittle shells probably don't want to be squeezed that much.

Your best bet is to find out what the size of your paint is and go just a tad smaller...
Nailed it, except you can go way more than .005" without breaking, even with high-end paint.
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Old 07-17-2012, 05:24 PM #7
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I didn't see it mentioned...

Paintballs have been getting smaller as well, though they seem to be coming back a little.
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Old 07-17-2012, 06:57 PM #8
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So then why aren't all guns undersized slightly to increase consistency, (all other things the same)? I would assume that players shooting high volumes would rather be sure the barrel is going to stay clean?


I have always been told when in doubt, overbore to make sure the paint won't bind and break. Maybe that is old news however.
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Old 07-17-2012, 07:12 PM #9
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Barrels have been getting smaller to catch up, but it is simpler for most to tune using an overbore.
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Old 07-17-2012, 08:00 PM #10
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Plus, if and when paint grows back to the right size, tightbore barrels could become unusable.
Manufacturers can't assume that the average user will know to replace the barrel were this to happen.
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Old 07-17-2012, 09:34 PM #11
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So what is the appropriate tightness on the ball that is trying to be achieved?

I have always tried to match my bores to the point where if I place a ball in and point toward a light source, there are 2-3 contact points. Enough that the ball won't roll out, but enough pressure that I can manually blow it out of the barrel.
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Old 07-17-2012, 11:29 PM #12
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Old 07-17-2012, 11:31 PM #13
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oh and youre opening a real can of worms with the what is the "best" bore to paint match there are differences of opinion there no doubt
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Old 07-17-2012, 11:33 PM #14
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don't mean to ask what is "best," just trying to find if people are thoroughly undersizing the bore more-so than what I have tried in the past, or still just trying to match to the decreasing size of paint.
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Old 07-18-2012, 12:26 AM #15
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IMO a truly tight underbore you will not be able to blow out.
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Old 07-18-2012, 05:40 PM #16
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I have to argue that it depends on firmness and shape of the ball. Too stiff a ball in my experience tends not to deform enough to shoot consistently. In that case, I tend to grab whatever "matches" well. Velocities remain pretty steady in this instance.
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Old 07-18-2012, 10:17 PM #17
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Pretty sure I read a thread on here awhile back that Lurker or someone else did testing on underboring and you can go as far as .008 before you have problems.
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Old 07-18-2012, 11:15 PM #18
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Interesting. I am looking to get a new UL back and wasn't sure if I should go with a .680 or .684. It sounds like I should start with the .680, but will probably need to pick up a .684 soon after.
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Old 07-19-2012, 06:50 AM #19
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I've been using my .680 a lot lately, but I can't comment on the size of paint at your local field.
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