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Old 18th January 2016, 08:12 PM
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Tench Tench is offline
WHFTA World Champion 2016.
Join Date: Sep 2009
Location: derby
Posts: 1,422

Originally Posted by hmangphilly View Post
Have you got a sooper dooper method for this pellet fit process mr tench .
I'm getting there but it's a right faff
You are right it is a right faf! you have to clock the barrel perfectly central, not easy to do on rifling! then bore the absolute smallest dia possible that removes all the rifling to create a smooth section as small as possible for the skirt to seal in. JSB pellet skirts measure over the nominal bore size but a larger dia requires a steeper taper to blend into the rifling. Then taper this into the rifling with the taper starting just in front of where the skirt of a loaded pellet sits. I do it with a very small boring bar and use about 2 degree taper (4 deg included angle). then polish it so a pellet glides in super smooth but shows no day light around it when sat in the loaded position.

Far too time consuming to do as a customer job but well worth the effort as it massively reduces fps variation.
HFT, for people with only 2 buttucks!

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