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Originally Posted by 320pf
For a pistol length gas system I would start with a gas port of 0.073".
You will probably end up with a gas port of around 0.080 to 0.085. If you get the gas port diameter right you will be able to shoot both sub-sonic and super-sonic loads without an adjustable gas block or tube. This will make your life much easier.
Just make sure you set your depth so you do not drill into the other side of the bore
320pf
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Oops, too late! :D
Just kidding, I was reading that seemed to be where Noveske barrels were ported and that a number of folks ended up around .110" for the 10" barrels. Reckoning pressure vs. dwell - with my barrel being 8" instead of 10"-12" that most folks have, I went ahead and drilled .125".
Almost got the hole perfect - and for the record this is the best use I've ever gotten from a Win 147 FMJ out of this barrel:
So, all dressed up now with nowhere dry to play. Went with the YHM 5C2 and drilled it out 11/32". Hopefully tomorrow will be decent enough to get out to the range and not so windy that my chrony blows over!
