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Airsoft Forum & MILSIM Forums > General Airsoft > General Airsoft Discussion > FPS to BB weight ratio


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Old 11-08-2009, 11:42 PM   #1
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Default FPS to BB weight ratio

445 FPS = .28 or .30 for best performance yes? Shouldn't be too heavy and drop off but shouldn't be too light and curve off?




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Old 11-09-2009, 12:22 AM   #2
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If you search there is a chart on this forum somewhere I think CornerPedler posted back in the day.

It was pretty good & showed a lot of weights/FPS.




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Old 11-09-2009, 12:26 AM   #3
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Thanks I'll look if I can't find it I'll ask for a URL.

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Old 11-09-2009, 01:52 AM   #4
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Here XD

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Old 11-09-2009, 06:16 PM   #5
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Thank youuuuuuuuuuuu!

The .30 should be perfect as I'm not looking to snipe with the damn thing. Gratsi.

Actually I'm probably go with the .36. Still keeps good FPS with it but also gets an approximate 13 more feet of range. Granted, I won't be let in to any CQB arenas with it but I prefer woods anyway.

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Old 11-09-2009, 07:30 PM   #6
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I might be missing it but I can't see the .36 with significantly longer range on that chart.

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Old 11-09-2009, 07:32 PM   #7
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450 FPS with .30 to .36. I was going to buy .30 but .36 at 450 FPS gets 13 more feet of range from the .30. Answered?

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Old 11-09-2009, 08:11 PM   #8
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Wow. Never seen that. Of course, Cornerpedler got off here shortly before I joined. Wonder where he got off to...

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Old 11-10-2009, 01:57 AM   #9
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before looking at the range you must remebr that you lose approximatley 40 fps for every .05 gram of bb weight therefore if you are shooting at 450 fps muzzle velocity with .25 gram bb then you will be shooting at about 370 fps with .36 gram bb. which would mean you actually lose maximum range in a vacuum ( how these numbers were achieved) of about 25 feet. Now this chart does not take into account the extra accuracy or "effective range" you will get with the heavier bb or the dramatic effect hop-up can have on the flight path.

If you are shooting 450fps with .2g bb i would guess even with hop-up off they would fly high at the tail end negating that distance increase. A heavier bb with the proper hop-up - but not too heavy will have a strighter more accurate flight and longer effective range on target.

I would see how .3g bbs work first before moving to .36g I think depending on the length of your barrel and the effectiveness of your hop-up it could be a great sweet spot between "punch", distance and accuracy.

I havea tight bore PDI barrel on an m4 shooting about 450fps w/ .2g bbs and have found the goldenball .32g bb with a proper amount of hop-up to be a great combination.

Remember the heavier a bb the slower it will go but it will retain its momentum for longer - however if it starts out too slow the target might be able to "matrix" you at the tail end of your effective range therefore negating any advantage


here is a link to a test of several brands of bbs by an independent lab if you want some in depth reading oand results on the subject - made me choose maruzens for a while - http://www.biovalbbb.eu/LevanteLabsBalisticbbTest.pdf

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Old 11-10-2009, 09:13 AM   #10
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the chart is very useful, it's from my album, but credit goes to The WarStore (an old member here, no longer active) the information was compiled by him. a valuable member, shame he's moved on...




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