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Are Moly coated bullets really faster? Featured science projectScience project video

Conclusion

The hypothesis that the moly-coated bullet travels faster than a bullet that is not coated with lubricant is not proven correct.

Coating the bullets with dry  lubricants such as  Molybdenum disulfide (Moly) will help to reduce the friction and heat generated inside the barrel of the gun. This will also increase the lifespan of the barrel and  reduce the need for frequent cleaning of the gun.

However, lubricant coated bullets result in lower barrel pressure. This lower pressure will result in the lubricant coated bullet to travel at a lower velocity compared to bullet without coating. In order to increase the velocity of lubricant-coated bullets, additional powder needs to be added in the case provided that there is enough space in it. If sufficient gun powder is loaded into the case to produce the same pressure as the bullet without the coating, the moly-coated bullet will actually travel at a much higher velocity than the non-coated bullet.

 

Also consider

The science fair project can be repeated with different types of lubricants.
 

References

Guide to bullet coating - http://www.6mmbr.com/bulletcoating.html

Shooting chrony chronograph - http://www.eabco.com/chronyshooting.htm

.22 long rifle - http://en.wikipedia.org/wiki/.22_Long_Rifle#cite_note-TimesNews_2008-03-28-1
 

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Complexity level:
9
Project cost ($):
200
Time required:
1 hour for preparation, 1 day for observation
Material availability:
Procurement of licensed firearms from authorized sources required
Safety concerns:

1.    Unauthorized use of firearms is illegal. Some countries carry extremely heavy penalties for the illegal possession or use of firearms.
2.    Ensure that only a trained and authorized/licensed person  is allowed to handle the firearm.
3.    The tests must be conducted in a safe environment - eg a proper shooting range.