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Old 10-05-2014, 03:29 PM #1
rf53
 
 
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Underboring? Give us your results...

I think many people will be interested in hearing from those of you who have gone away from large bore stock barrels (.691+) and are underboring based on findings that underboring is the way to go. Before I ask some questions about your experience, lets start with two accepted concepts:

First, research conducted regarding barrels indicates that:

1. Overboring or underboring does not improve accuracy.
2. Ball/bore matching is actually a negative.
3. Overboring and underboring both improve consistency.
4. Underboring does improve efficiency.
5. A barrel length of 12" to 14" provides the best results.

Second, over the past few years the size of paintballs has decreased from an average of .689 to the current average of .682 to .685 (before swelling in humidity).

Questions:

1. What bore/paint size are you using?

2. What is the average temperature where you play?

3. What length barrel are you using?

4. Have you noted any improvement over your larger bore barrel in either accuracy, consistency, or efficiency? If so, describe?

5. Are you experiencing an increase in paint break?

Last edited by rf53 : 10-05-2014 at 03:34 PM.
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Old 11-09-2014, 06:06 PM #2
OldSchoolWGP
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1) .675 / .680 bore...paint's all over the place.
2) Summer temp 80's, Spring Fall 40's-70's...average humidity
3) 4" Inception Stella back with CF whip tip
4) Better shot on shot consistency, improved efficiency. Marginal improvement in accuracy
5) No more than before.
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Old 12-01-2014, 02:33 AM #3
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Quote:
Originally Posted by OldSchoolWGP View Post
1) .675 / .680 bore...paint's all over the place. 2) Summer temp 80's, Spring Fall 40's-70's...average humidity 3) 4" Inception Stella back with CF whip tip 4) Better shot on shot consistency, improved efficiency. Marginal improvement in accuracy 5) No more than before.
so the larger bore size gave you better accuracy, consistency, and efficiency? Or is it for the Underbore?
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Old 12-01-2014, 10:01 AM #4
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There is a ton of data out there from the Punkworks testing, Flasc barrel testing and others that you should look up instead of asking players on here who likely haven't taken a scientific approach. Underboring increases both increases consistency and air efficiency. Over boring increases consistency but obviously decreases efficiency. Paint matching gives moderate efficiency and consistency and is pretty much the least desirable option. There are two small downsides to under boring. The first is that if you use to small of an underbore it can cause random spin on the ball that can throw off your shots. The second is that with either too small of a bore, bad paint, cold paint or extremely brittle paint you run a slightly higher chance of getting a break in the barrel.

I generally underbore in the summer and use a slight overbore in the cold. My consistency stays great (plus or minus 5 usually) with either setup and I only sacrifice a small amount of efficiency in the winter months. Obviously the paint itself plays probably the largest role and the higher quality paint is usually going to shoot straighter and more consistent. Another big factor is using a quality high pressure regulator that is properly maintained. The barrel actually doesn't play as significant of a role as people think but of course every bit helps.

Last edited by Mr. Stealthy : 12-01-2014 at 10:04 AM.
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Old 12-02-2014, 06:17 PM #5
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Tried underboring using white box seconds.

Had terrible accuracy and consistency, switched to overbore. Accuracy improved

Most likely cause was terrible paint.
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Old 12-03-2014, 07:05 PM #6
Kbug
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If I'm playing pump, I'll usually go with something like a .681. I'f I'm playing semi, then I'll go up a bit to a .684 or .687.
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Old 12-03-2014, 08:16 PM #7
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I'll bore by a size up. Have had far too many 'anomalous' over-sized balls compared to the rest of the batch get stuck in a barrel (once during a tourney) to bother with the underboring bull**** anymore.
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Old 12-04-2014, 07:47 AM #8
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I've tried underboring with good results in warm weather using a .684 freak but now with cooler temps I've had to increase to a .687 to avoid barrel breaks.
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Old 12-08-2014, 11:22 PM #9
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Like it was mentioned above; I think the quality of paint plays the biggest factor in accuracy
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Old 12-11-2014, 05:25 PM #10
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Quote:
Originally Posted by rf53 View Post
1. Overboring or underboring does not improve accuracy.
[...]
3. Overboring and underboring both improve consistency.
These two conflict. Consistency is a cornerstone of accuracy. Ignoring all other factors, inconsistent velocity between shots will have variation on the vertical axis. In other word, faster shots will hit higher than slower ones. The more consistency between shots the less deviation there will be as a result.

Quote:
Questions:

1. What bore/paint size are you using?
2. What is the average temperature where you play?
3. What length barrel are you using?
4. Have you noted any improvement over your larger bore barrel in either accuracy, consistency, or efficiency? If so, describe?
5. Are you experiencing an increase in paint break?
1: I use a lot of different paint. From various tourney grades, to mid and cheaper, to white box.
2. From below freezing to over 100. One tourney I played where it started in the 30's and ended over 60.
3. Typically 14 or 15 inch.
4. If the forecast calls for a typically consistent weather, then I'll chrono and shoot a bunch of paint through a few different backs and see which one is doing the best that day. If the forecast says temps are going to rise significantly throughout the day I'm playing, then I'll do the same thing with multiple backs, but with overbore. That being said, I prefer to underbore. I typically see more consitancy. I don't care so much about efficiency since I usually play speedball and don't take out enough paint to drain my tank, and filling between games.
5. Only time I typically see barrel breaks when I underbore is when the weather is changing fairly quickly and the paint is reacting.
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