newest chrony numbers for the 13xx
i adjusted the valve and piston a wee bit more and poilished it a bit more also
with the predator bigboys i am getting 489 fps with 25 pumps
they are 26.2 grains
and it is dead on accurate with these
the gun a 1322 with 18 inch bbl
im still tweaking it i need to change out valve and hammer springs yet i want to get mid 500’s wit the predator bigboys with this gun
i didnt chrony the cp’s nut i suspect they are in the mid 700’s now
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i did the math and you are correct
however after chronying the cps befor i as hitting 700 and then the bigboys were getting 435
now the big boys are getting 489
i dont know why but the heavier ones dont gain as much fps per grain as the cp’s do
ill chrony the cps today
490 with the big boys will put the CPs in the mid 600s.
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that thing is coming right along nicely 8)