vent size

[little joe]

I,m shooting 3f and priming with 4f. What size vent hole do you guys use?  

[Pete G.]

1/16"

[SCLoyalist]

1/16" for starters has never given me any ignition problems.   The hole will enlarge over time from gas erosion.   I think the last vent liner I replaced because it had gotten too large had gotten up somewhere around 3/32".   A White Lighting liner comes with less than a 1/16" diameter; Drilling it out to 1/16" at installation seems fairly common practice.   Too small a diameter and you are more prone to misfires (but get less muzzle velocity variation), too large and you can push a little main charge powder out the vent during loading.  

Your question seems like something that Larry Pletcher would possibly have an article and test data  on over on his website.

[wattlebuster]

1/16th works real good for me 

[hanshi]

1/16"

[bgf]

1/16 is all I need and it works well for 2f and 3f.  I tried 5/64" and 3F starts coming out (Graf's, which is a little smaller grain size than Goex), but you could probably go all the way to 3/32" for 2F Goex and it would likely never plug, although you'd be venting some pressure.  The smaller holes (under 1/16") worked well with 3F Swiss, but caused problems (fouling) with other powders.  I agree with SC Loyalist for 3F -- when the hole gets ~>3/32" it is time for replacement, sometimes before.  It will start to shoot a little funny and erosion goes faster and faster -- at least that is what happened to me.

[stone knife]

I,m shooting 3f and priming with 4f. What size vent hole do you guys use?  

I drilled mine out to 1/16 works good