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Post by bowbender6 on Mar 29, 2009 15:20:26 GMT -5
I have a lot of shots but only about a year’s experience shooting this MLII. When do you change vent liners? I think around .035” is what I‘ve read. I went through about 3-5 vent liners in the first 300 shots, then Clint gave me an RW vent liner last April. I now have 333 shots on it and it is .034” measured using a pin gauge. This seams like a lot of shots. Could the reason be I haven’t been drilling out my breech plug. I thought I read somewhere some guys don’t drill theirs out. The hole in the breech plug was about .065” when I checked it today. I don’t seem to have any ignition problems and the gun shoots .75”-1.5” moa pretty consistent with my best loads. Is their a downside to not drilling out my breech plug? I will defer to you guys who have shot and tried just about everything with this gun and saved a lot of us newer members a lot of headaches. Thanks to all
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Post by Chris Champion on Mar 29, 2009 18:26:06 GMT -5
Tim,
I went about 200 shots on my breech plug toward the end of last year and didn't drill it out. I could not tell a difference in ignition or group size. I do change out my RW vents every 100 shots but probably wouldn't need to. Its more for peace of mind than anything else.
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Post by smitty on Mar 29, 2009 18:34:38 GMT -5
I used to drill the carbon out the middle of my breechplugs everytime I changed the vent and noticed it always took a few shots with the new vent and clean plug to get my groups back. Then awhile back I believe it was Edge that mentioned "the dirty plug method" of only cleaning the primer pocket and changing the vent. This method has worked great for me !
I can't say whether it increases the vent life cause I choose to change my vents every 50 shots to eliminate any potential accuracy issues with an increasing vent dia. I've also had better accuracy with a .030 dia vent hole but that's for another post.
smitty
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Post by Richard on Mar 29, 2009 20:52:44 GMT -5
The life of your ventliner is directly related to the loads you shoot. The other day, I shot only low (er) velocity single powder loads and after 21 shots, my home drilled ventliner showed almost no increase in size (maybe .0005"). Conversely, after shooting 30 shots of my 10/60 (5744/H-4198) 300 gr. load, that same ventliner has increased .004" and gets tossed in the trash!
Richard
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Post by Dave W on Mar 29, 2009 22:11:26 GMT -5
I change at .035.
I think the fouled plug could save on vent life since there is a smaller passage for gas to flow back and forth between the primer and vent, with a lesser volume of gas there should be less gas cutting on the vent. I would think vent quality and load pressure would effect the life expectancy of the vent also.
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Post by Harley on Mar 29, 2009 22:18:15 GMT -5
Like DaveW, I change VL's at .035; but, I do clean my bp after every outing. I don't have a clue whether this is good or bad; I just do it for the sake of consistency - I don't trust a gradual buildup of crud in the bp.
Harley
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Post by bowbender6 on Mar 30, 2009 7:25:22 GMT -5
Thanks - most of these shot have been with fairly hot loads - 60gr n120 and 65 gr R7 and 44 gr of N110. Sounds like if it works keep doing it. I remove the breech plug and vent liner every 15-30 shots and re-lube and check hole sizes.
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Post by DBinNY on Mar 30, 2009 16:58:35 GMT -5
bowbender, the N120 and R7 loads are high velocity but they don't reach as high a peak pressure or reach peak pressure as fast as a powder like AA5744 with a lower velocity load. I haven't shot N110 but can say that I think 5744 is tougher on vents than R7 based on my experience.
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