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Old 12-17-2017, 08:42 PM   #8 (permalink)
tymcneer
Brass Monkey Customs
 
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Join Date: Oct 2006
Location: Bowie MD

Brass and Wood Fan
Kilt Club
Some "simple" math...

FSR fins are about 1 rev per 12" of flight.

At 300 fps this means 18,000 rpm, assuming everything is "perfect"

After a discussion with uv_halo, we decided the Lapco is about 1 rev per 48" of flight, which translates to 4,500 rpm

He and I agree that the Hammer Head and the Lapco use about the same rifling rate, so the 1,350 rpm number is either measured or concocted.

I am glad to see that someone has finally figured out that bullet style rifling is not as good at gripping a "soft" shelled round, as pellet gun rifling.

Ty
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Brass Monkey Customs

Brass Freak, Freak XL compatible and Equation inserts in .670, .678, and .685

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