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Old 12-17-2017, 09:42 PM   #8 (permalink)
Brass Monkey Customs
tymcneer's Avatar
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.


Brass Monkey Customs

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

Still selling brass tubing, with .678 barrel stock available!

My feedback: MCB - eBay - AO

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