Engagement limits for 8mm BB's

[El Phantasamo]

Ok, NUMBERS TIME!

Our engagement limits are based around muzzle energy of .2g BB's. Remember Force = mass X acceleration

the following chart is based on .2g 6mm BB's

280fps = 0.72 Joule
300fps = 0.83 Joule
350fps = 1.13 Joule
375fps = 1.30 Joule
400fps = 1.48 Joule
425fps = 1.67 Joule
450fps = 1.87 Joule
500fps = 2.31 Joule
550fps = 2.80 Joule

Form this chart, we can see that the energy limit for CQB is 1.13 Joule. SO for Andrews 8mm MadBull shell, lets see what velocities he limited to so It can be used in CQB

.34g 8mm BB
225fps = 0.80 Joule
250fps = 0.98 Joule
275fps = 1.19 Joule

.45g 8m BB
225fps = 1.05 Joule
250fps = 1.30 Joule
275fps = 1.57 joule

So lets convert our engagement limit chart from FPS to Energy in Joules. I'm basing this off of AO rules and new MiA rules.

1 - 350fps 0Joule - 1.13j
351 - 499fps 1.14j - 1.48j
400 - 499fps 1.49j - 2.30j
500 - 600fps 2.31j - 3.33j

We could divide this further to engagement limits every 10 feet, but WHY? Let's try to keep this simple and fun. But NO ONE wants to be blasted at 410fps from 7 feet away!

Note: If Andrew gives me some realistic velocities for his madbull shell, Ill amend the 8mm chart

[Mitch1313]

Do the 8 millies actually hurt anymore than the sixers?

[El Phantasamo]

I would say so because they have a lot more energy than 6mm BB's fired at the same velocity.

If you look at my charts, youll see a .45g 8mm @ 275 FPS has A bit more energy than a .20g 6mm @400 FPS

I think the 8mm guns are going to become a bit more common in the future. especially with my little 8mm project I have planned (COUGH ma duce COUGH)

I will keep the velocity reasonable