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There is no deffinate standard. It varies in different times of manufacture. I have seen GH guns with as fine as 22 lpi and DH guns with as course as 20 lpi.
General rule of thumb is:
Trojan: 16
VH: 18
GH: 18 or 20
DH: 20 or 22
And... Original checkering would not be fully pointed in any of these grades.
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