The Purdy Prescription

The PL should be the 21.---. It is the length you end up with when you subtract the ID of the tuning device and the length to set the overall length to.
 
The PL should be the 21.---. It is the length you end up with when you subtract the ID of the tuning device and the length to set the overall length to.


I was just going by the spreadsheet that was distributed except I modified it for the 5th harmonic. I thought PL (physical length) was referring to how far the tuner should stick out after the EC was subtracted. Now to find someone who can make one for me!
 
i have a steyr lg110 in 0.177 cal.

what is the recommended tuning order for a 17 inch barrel?
 
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