What brand BBs are best nowadays? Bang for buck.

[Jamsandwich]

if your gun is travelling at 300 FPS, and your BB shoots 300 FPS, your BB will still be travelling at 300 FPS, because the speed of BB is constant regardless of frame of reference according to relativistic physics, it may look faster but it is experiencing time differently because of time dilation via Magnus effect applied by the hop up

If your gun is travelling at 300fps then your BB will be travelling at 300fps anyway.  Along with all the BBs in the magazine...and the magazine.  If you happen to be attached to your gun then you'll be travelling at 300fps too!  I'm not sure relativism has much to do with it at that point, though you might get some funny looks off the marshalls.

 

[Dan Robinson]

If you're firing the BB's whilst supermanning your way down the field, then your bb's will be at 300FPS plus muzzle velocity, and your relatives will be contacted to collect your personal effects.

How long the BBs continue to travel at that speed I can't be bothered to work out, because frankly this is getting a bit too Monty Python. LOL

 

[ParHunter]

The .2 will slow to match the .3 velocity but even thenen the .3 will lose velocity slower because of its 1.5 times more mass.

And that is where the momentum comes in ? But you are right that the drag increases exponential. Every EV owner will be able to attest that you get a lot more miles out of your battery at 60mph than at 80 (completely theoretical speed of course ? 

 

[Dan Robinson]

Every EV owner will be able to attest that you get a lot more miles out of your battery at 60mph than at 80 (completely theoretical speed of course

Theoretically I can get my Milk Float (actually a 40kW Leaf) to my mum's house using anything from 3% if I'm being boring, to 26% if I make full use of the available tarmac and use the (software limited annoyingly) 89mph top speed.  Funnily enough the heater makes next to no difference, but a wet road or cold weather makes a mahoosive difference.  Would love to hack the management software and get some more angry pixies flowing.

Hyper-miled my 3 tonne Transit van once and got something like nearly 700 miles out of it instead of the usual 380.  It was a very tedious week of driving.

 

[Sewdhull]

Momentum is a made up value in calculations governing the motion of bodies, usually considered lossless to illustrate how they move in collision.

Even in a car crash it's energy that matters not momentum, same for injuries from projectiles.

There is a relationship between energy (a real thing) and momentum because of maths. Sometimes complicated maths.

Think in terms of momentum if you want to, but our guns observe energy as a measure.

 

[Lozart]

Momentum is a made up value

Pretty sure there's a good few physicists that would argue the toss over that.

As for the relationship between energy and momentum, the maths is pretty bloody simple (for non-relativistic bodies anyway).

The kinetic energy of an object is related to its momentum by the equation:

where:

• 
   is momentum
  
• 
   is mass of the body
  

Momentum being the product of mass x velocity.

 

[Leo Greer]

Whoa, why are we talking about time dilation here?? And sausage!

Gotta say, I'm more interested in the latter.

 

[gavinkempsell]

Gotta say, I'm more interested in the latter.

oo-er misses.

 

[Dan Robinson]

hhhmmm.

Just took delivery of a jewellers scale and I am now fighting the urge to measure all my bbs.

Simply because the dozen or so I took out of a packet were all kinds of different weights +-.04g.

Ggggrrrrrr

 

[Sewdhull]

You can't put much faith in scales unless your paying hundreds of pounds.

Mine cost a tenner tho

As an example I weighed 6 .25g bbs.

2 were .25 and 4 were .27.

4 together were 1.00g

6 together were 1.52g

Repeatability was good but it looks like the error in each measurement is likely similar meaning much more at low weights.

Worth getting a calibration weight or two if it matters to you.

Or weighing in batches.

 

[Leo Greer]

Myself and a few others did some testing a little while back. Here's the results we got:

https://www.airsoftsniperforum.com/threads/crack-open-some-bbs-bb-quality-and-comparison-discussion.67345/