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Old 05-02-2012, 10:43 PM #1
SNAKESNIPER (Banned)
 
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UnderBORING *yawn*

Yeah, I know this has probably been asked. How much underbore is too much underbore?

I mean, .675? Seriously? That seems crazy to me.

Feel free to troll on my un-knowledge.
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Old 05-03-2012, 12:04 AM #2
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approx .003-.005
EX** if the paint stops rolling through a .685 barrel use at least a .682 but not smaller than a .680 /.679 the extreme underboring like you referred to is usually used by pump players
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Old 05-03-2012, 01:39 AM #3
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Too much in my experience is in the high teens and higher.
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Old 05-03-2012, 03:54 PM #4
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I could have sworn I posted in this thread last night but I guess not.

I think .675 is probably cutting it too low. The window according to cockerpunk's youtube test is .006-.008 max underbore before things start getting bad but I think if you can do .002-.004 you're on the money. Even though I've been seeing tiny paint I still have no trouble getting a good underbore with a .680 (and frequently my .684 gives me a good tight fit also) so I would stay north of .679.
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Old 05-03-2012, 04:12 PM #5
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I did have one case of paint (and I have no idea what brand) that rolled through a .679 and I had to use my .676.
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Old 05-03-2012, 04:40 PM #6
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Paint keeps getting smaller, yet all the boxes are labelled .689

Makes it a bit hard to buy a .679 with any confidence.
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Old 05-03-2012, 05:13 PM #7
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Quote:
Originally Posted by SNAKESNIPER View Post
Yeah, I know this has probably been asked. How much underbore is too much underbore?

I mean, .675? Seriously? That seems crazy to me.

Feel free to troll on my un-knowledge.
up to .008 is known to not affect a paintballs breakage. .008 underbore is most effective as it brings the largest increase in velocity.


whoever said .005 is wrong. punkworks confirmed this with numbers and real world testing.
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Old 05-03-2012, 05:14 PM #8
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Using Karnage, ProCaps (or DXS or whatever the crom it's called), & RPS, i've been using a .678 Eigenbarrel and .679 Freak, and that is borderline underbore, as in the paint will roll through any bore larger than those two. I'm pretty sure a .676 isn't too crazy.
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Old 05-03-2012, 05:39 PM #9
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I use the .684 Eigenbarrel, and I haven't had any paint roll right through, but it blows through pretty easily. I might get the .678.
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Old 05-03-2012, 06:08 PM #10
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I've had paint roll through 684/685 and I never had anything smaller in my kits until I got an empire sniper.
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Old 05-04-2012, 12:31 PM #11
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I use the .684 Eigenbarrel, and I haven't had any paint roll right through, but it blows through pretty easily. I might get the .678.
I use the .678 on my mini and I haven't noticed any more/less barrel breaks and I shoot all kinds of paint. The only downside I've noticed is that if you have a ball chop, you have to completely remove the barrel and clean it. You cannot shoot through it like with other barrels. With the Eigenbolt + .678 Eigenbarrel my mini shoots real smooth and consistent (+/- 4 FPS) with a broke in stock spring. PSI turned down to 140 and dwell at 8.
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Old 05-04-2012, 01:25 PM #12
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Anyone know how long the control bore is on the Lurker barrels?
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Old 05-04-2012, 05:30 PM #13
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Originally Posted by SKI008 View Post
I think .675 is probably cutting it too low. The window according to cockerpunk's youtube test is .006-.008 max underbore before things start getting bad but I think if you can do .002-.004 you're on the money.
Things don't really get "bad" they just get "suboptimal" ... breakage and such doesn't really happen, even in those tests the increase in breakage was tiny. Fact is underboring really doesn't cause ball breakage per se ... the ball will actually get stuck in the barrel before it breaks most times. The exception to this is abnormally brittle/uneven shells, such as in very cold weather.

That said, you do probably want to aim for .008-.010 or under. Of course this is all dependent on how you measure your paint ... there is no standard way to measure it.
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Old 05-04-2012, 10:06 PM #14
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Anyone know how long the control bore is on the Lurker barrels?
9.5"

I have experienced rollouts on a .680 insert (RPS Premium), so .675 will would work and not be severely under boring (depending on the paint size). i use the blow method to size my paint, but pick a size i can still blow paint out of.
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Old 05-04-2012, 10:40 PM #15
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Wow, the bore on the CF Boomstick is only 7". I guess that makes my choice for me.
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Old 05-04-2012, 11:13 PM #16
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Quote:
Originally Posted by drgonzo View Post
Things don't really get "bad" they just get "suboptimal" ... breakage and such doesn't really happen, even in those tests the increase in breakage was tiny. Fact is underboring really doesn't cause ball breakage per se ... the ball will actually get stuck in the barrel before it breaks most times. The exception to this is abnormally brittle/uneven shells, such as in very cold weather.

That said, you do probably want to aim for .008-.010 or under. Of course this is all dependent on how you measure your paint ... there is no standard way to measure it.
I think the issue wasn't increased breakage but increased instances of bad spin. It's been a while since I saw the test but I feel like the problem had something to do with the squeeze causing bad spin.
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Old 05-05-2012, 12:22 AM #17
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Overbore 4ever! .693!!!
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Old 05-05-2012, 12:38 AM #18
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I think the issue wasn't increased breakage but increased instances of bad spin. It's been a while since I saw the test but I feel like the problem had something to do with the squeeze causing bad spin.
I get bad spin with my .684 about 40% of the time, but I think that has more to do with me shooting crappy paint.
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Old 05-05-2012, 07:00 AM #19
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I think the issue wasn't increased breakage but increased instances of bad spin. It's been a while since I saw the test but I feel like the problem had something to do with the squeeze causing bad spin.
Spin really begins to be a problem when you exceed .006" under-bore. Here's a comparison I made using Marbs (.006" underbore vs. .012" overbore).



To save some time:
.700 grouping
.680 grouping

Last edited by robertseakykr : 05-05-2012 at 07:03 AM.
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Old 05-05-2012, 05:36 PM #20
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so i'm confused. you used a .700 bore barrel and a .680 bore barrel? thats a .020 increase, not .006
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Old 05-05-2012, 06:22 PM #21
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And is that a tippman? those things aren't the smoothest shooters.
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