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Post by Overkill on Aug 7, 2011 8:38:17 GMT -5
I have been looking at BB's on several sites, trying to find different types to try, etc. I have noticed a few sites labeling BB's as either 5.95mm or 5.98mm. Given that tightbores go down to 6.01 (I use a 6.01 actually in my CA8-02), I couldn't help but notice that a 5.98 mm BB would increase compression significantly. Is this just something fraudulent that's being pandered about, or is there actually a difference? I haven't been able to find a clear-cut answer on this, short of buying various types of BB's and actually putting some calipers to them.
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Post by Knief on Aug 7, 2011 11:31:58 GMT -5
There are some slight differences, but there isn't exactly a formula to tell you which ones you should use. What you should do is try out a couple different brands and see whether a smaller or larger diameter ammo works better in your barrel. But that's the same for weight, too. If maximum accuracy is your goal, you've got test a lot of ammo to find out which ammo gives your gun the best grouping.
As for your thoughts about bb size, compression and a 6.01mm barrel, I would caution you that a 6.01mm barrel is actually too tight for AEGs. Your bb needs an air cushion to ride on as it travels down the barrel. If that cushion is too thick, yeah, you lose some power and some accuracy as the air slips past. But those symptoms are even worse if that cushion is too thin. Instead of a bit of air loss, your bb ends up hitting the sides of the barrel. That lowers velocity significantly, decreases accuracy dramatically, and fucks up the spin from your hop up. Really, a 6.01mm barrel is one of the worst "upgrade" products you can put in most AEGs. If you happen to use small bbs, then the negative effects might be mitigated. But at that point, why limit yourself to a certain set of bbs. Just stick to a 6.03 or 6.04 and you'll be fine.
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Post by Overkill on Aug 8, 2011 15:51:45 GMT -5
There are some slight differences, but there isn't exactly a formula to tell you which ones you should use. What you should do is try out a couple different brands and see whether a smaller or larger diameter ammo works better in your barrel. But that's the same for weight, too. If maximum accuracy is your goal, you've got test a lot of ammo to find out which ammo gives your gun the best grouping. As for your thoughts about bb size, compression and a 6.01mm barrel, I would caution you that a 6.01mm barrel is actually too tight for AEGs. Your bb needs an air cushion to ride on as it travels down the barrel. If that cushion is too thick, yeah, you lose some power and some accuracy as the air slips past. But those symptoms are even worse if that cushion is too thin. Instead of a bit of air loss, your bb ends up hitting the sides of the barrel. That lowers velocity significantly, decreases accuracy dramatically, and fucks up the spin from your hop up. Really, a 6.01mm barrel is one of the worst "upgrade" products you can put in most AEGs. If you happen to use small bbs, then the negative effects might be mitigated. But at that point, why limit yourself to a certain set of bbs. Just stick to a 6.03 or 6.04 and you'll be fine. Yeah, I grabbed a 6.01 just so if it worked I would have nothing to lose and if it didn't it would end my curiosity about it for all of time. Actually right now its working simply fantastic, and is theoretically shooting right where it should be with amazing groupings. Thanks for the info on BB's though, I guess the great BB hunt shall now commence for me. Running a club means having to satisfy a lot of people, so we buy tons of different BB's. Maybe I can post a little synopsis or "chart" of our experiences with them, actual diameters, etc. We are a school of super nerdy engineers, we should be able to come up with something... |
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thedeisel
New Member
Operator ID: S51
Posts: 619
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Post by thedeisel on Aug 12, 2011 23:17:11 GMT -5
BB's are around 5.95mm because if you go too big a small piece of dust or whatnot will cause havoc.
I do understand the higher the weight of the BB(like .38) will be a bit bigger than a .20g.
If only I had my Caliper with me to help you, but alas I don't.
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Post by kustom on Aug 13, 2011 21:18:57 GMT -5
Ummmm. No.
The heavier BB's are not bigger, they just have more mass in the normal size. this is done by using a denser plastic, or removing air bubbles that are deliberately introduced in lighter weight BB's.
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thedeisel
New Member
Operator ID: S51
Posts: 619
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Post by thedeisel on Aug 14, 2011 10:34:01 GMT -5
When I had an L96 the .38 bbs were bigger than .20's.
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Post by kustom on Aug 14, 2011 12:01:53 GMT -5
That's odd. Although, as we've seen, manufaturer's make different sizes, but it's not really based on weight.
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thedeisel
New Member
Operator ID: S51
Posts: 619
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Post by thedeisel on Aug 14, 2011 12:40:05 GMT -5
Yeah I compared them. Both were Madbull BB's.
There wasn't a huge difference, but with a caliper you can see it.
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Post by Ike on Aug 15, 2011 19:34:56 GMT -5
The difference in compression between BBs that are (at most) six one-hundredths of a milimeter different in size will not be noticeable. You won't see any FPS gain. What you want is consistency from your ammo. Here's a link to an article that compares different brands of BBs. It only compares .2s, which you shouldn't be using if you are after accuracy, but it gives you the mean and standard deviation of different characteristics of each brand, which hopefully would translate over to that brand's heavier BBs. www.airsoftmechanics.com/home/content/view/19/26/1/0/Part 2: www.airsoftmechanics.com/home/content/view/13/26/ |
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