Airsoft Sniper Forum banner
1 - 20 of 29 Posts

· Registered
Joined
·
3,685 Posts
Discussion Starter · #1 · (Edited)
Recently I've used a number of brands of BBs, and I've cracked them open to inspect their internal air bubbles, as uneven air bubbles will throw off the BB's center of gravity, and not make it accurate.

If you'd like to add your own results, just crack open 10 BBs with a the flat part on a pair of needle nose pliers, and be sure to include the appropriate info like below.

Brand, weight, bio/non bio, how they shoot/you like them
Here's what I have on hand right now.
Don't mind the yellow tint, my camera didn't seem to like a 350 watt light bulb.

BLS .48g, non bio, shoots 8.5/10
Very little to no bubbles
Coin Currency Money Money handling Tints and shades


BLS .45g, bio, shoots 6.5/10
Very little to no bubbles
Coin Wood Font Plant Circle


Novritsch .36g, non bio, shoots 7/10
Very little to no bubbles
Coin Currency Money Wood Money handling


Tippmann .30g, non bio, shoots 4.8/10
Some have large bubbles, some have nothing
Coin Wood Font Currency Tree


ASG .28g, bio, shoots 5.7/10
No bubbles, very good
Coin Wood Saving Circle Font


Elite Force .20g, non bio, shoots like .20g
Medium bubbles, sort of centered
Food Plant Tree Wood Font


Game Face .20g, non bio, shoots like .20g
Big bubbles, off center usually
Coin Wood Currency Money Saving
 

· Registered
Joined
·
3,685 Posts
Discussion Starter · #5 ·
I find that diameter is difficult to do if the thing is egg shaped, so don't feel too obligated to do that.

Weight is probably the best and cheapest method of sorting, but it takes ages. Seems like accuracy has a lot more to do with bubbles than I had thought.
 

· Registered
Joined
·
240 Posts
bubbles are imperfect, so that creates an imbalance, and the BB spins off course.
I believe that imbalance will be extremely small, unnoticeable, with zero affect to bb trajectory, in case of negligible or just tiny few bubbles (no data to support that, just what I see during tests-games using Geoff's-BLS). I just believe this, especially if these heavies are been shot by rifles above 450ft/sec (DMR's - Bolt Actions). I haven't seen bb trajectory difference even with my pistol which shoots 0.4gr, below 1j.
 

· Registered
Joined
·
3,685 Posts
Discussion Starter · #8 ·
It won't be super important for hop trajectory as long as the BBs don't vary in size or weight as that changes hop setting, but it will lead to varying right and left curves if the bubble is on one side more than the other.

More noticable at longer ranges with higher powers, but if you're trying to hold tight groups at closer range you should be able to notice too.

When my guns are finally perfect, I'd like to compare a bunch of BB weights and brands in an accuracy test, as that'd probably be pretty useful. Batch dependant, but usually companies with shitty stuff will continue to be shitty, while BLS and Novritsch have a reputation to uphold.
 

· Registered
Joined
·
140 Posts
Ironically, I think our guns will never be perfect until we quit trying to make them perfect.

Hop is based on the Magnus effect, which is affected by BB size, shape, outer finish, finish consistency, mass, and rotational inertia. I’m sure bubbles do affect hop curves, since any uneven distribution of mass will affect the axis of rotational inertia, but it would be unpredictable and extraordinarily difficult to get real numbers on, since the BB’s orientation when contacting the hop rubber matters, as well as the actual placement and size of the bubbles themselves, both of which would have to be measured by scanning each individual BB to determine bubble placement, and then hand-loading to test different orientations.

No thank you. I’ll stick to theoretical sciences on this one—when unevenly balanced objects spin, they attain extra inertia in different directions due to the uneven movement of mass. In physics terms, if we put air resistance aside, bubbles are exactly the same as lumps or protrusions on the surface of the BB. In practical application, they would shoot differently, but in a model situation, they work almost identically.

Here’s an example. This isn’t directly applicable, but it showcases the concept. Imagine throwing a stick end over end, with one end weighing twice as much as the other end. The stick would rotate, and the point it would rotate on would be 3/4 of the way towards the heavy end. Because distribution of mass shifts the axis of rotation, the BB, instead of spinning evenly, would spin erratically, because air resistance matters immensely to .30g objects, even though it doesn’t matter so much to the stick in the example.

How prominent this effect actually is, I don’t know. How much it actually effects flight path, I don’t know either. But, I am 100% certain that it does affect the flight path, because it’s physically impossible for it not to do so, detrimentally, over a BB with perfect internal consistency.
 

· Registered
Joined
·
3,685 Posts
Discussion Starter · #10 ·
Well if you look at my ratings, the bubbles seem to have something to wo with groupings. The reason .12g BBs suck so bad is because of their off center bubbles, plus lower quality manufacture. Cracking open BBs is one of those things where you wanna test the BB, but you've already split it in half and can't test it. You could try and catch BBs in a sheet of clay behind a target and split them after which is something you could do, but no point doing it as I'm absolutely certain that an off center bubble or bubble in general leads to an off center center of gravity, which will lead to curves on the 0-90-180 degree quadrants on the pic. If your gun is doing this and everything is good, I'd say that weird BBs are a good chance. From now on I'll stock a bag of super high quality BBs just to check my guns if I'm having issues, it'd be pretty useful.
Font Circle Automotive wheel system Symmetry Slope
 

· Registered
Joined
·
140 Posts
Right now Evike has something called CL Project Bushido BBs in stock. I’ve heard that these are close to the highest quality BBs you can get, so I ordered a bag of .30g. They’ll end up on the chopping block as well… at least a few of them.
 

· Registered
Joined
·
3,685 Posts
Discussion Starter · #14 ·
If anybody has some Novritsch .46g, .49g, BLS .50g, and some Maruzen SGM .29g I'd be pretty interested in those.

I'd also like to see some of the discontinued APS brass and some .69g cracked open, probably like splitting an atom.
 

· Registered
Joined
·
140 Posts
I’m pretty sure that the Bushido are supposed to be super mirror polished, but also really, really consistently sized, weighted, and mixed. For mythical medium polish I’ll whip out my G&G .30s and .25s. I can confirm, they really do perform better than high polish, ime. The .30s get used for my longer range guns while the BLS .32s sit in their bag and give off sad vibes. :p
 

· Super Moderator
Joined
·
4,221 Posts
So Bushido... JFM, PFG. I have thus dubbed these Bullsheeto. Because I landed some shots that I straight up did not deserve. Cybergun Scar-L basically stock. The only thing I changed was the motor. They are quite accurate. Paper plate size at about 175ft or so. 1.5J with .32g.
 
1 - 20 of 29 Posts
Top