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Factory barrel & PRX
- Thread starter linekin
- Start date
D
Doug
Guest
Prx
You could play with a factory that had a heavy barrel & counter bore but you are probable "pissing in the wind" with anything less!
However, Tony's Formula can tell you how much to counter bore any barrel for a given harmonic.
Make Sense??
You could play with a factory that had a heavy barrel & counter bore but you are probable "pissing in the wind" with anything less!
However, Tony's Formula can tell you how much to counter bore any barrel for a given harmonic.
Make Sense??
You could play with a factory that had a heavy barrel & counter bore but you are probable "pissing in the wind" with anything less!
However, Tony's Formula can tell you how much to counter bore any barrel for a given harmonic.
Make Sense??
Doug, it doesn't make sense. I have Tony's worksheet & unless I'm missing something the AL is always longer than the barrel itself.
For instance, a 20 in barrel in the 9th harmonic.
20/8=2.5x9=22.5 AL
See... it comes out 2.5 in longer .
I am just pissing in the wind. I'm just curious is all & probably missing something.
I have seen a few heavy barreld gun with their barrels shorten that shot really well & was wondering if the were in better tune is all.
Keith
D
Doug
Guest
Keith,
Hopefully Tony will correct me if I am wrong:
Tony stated The PRX works best for barrels that are between 22” & 25” long.
The formula was built around the concept that the Physical Length is always longer than the Barrel Length (bolt to crown).
Next it assumes that the ID from the crown to the physical end is larger than to rifle bore.
Make Sense??
For a rifle where the PL & the BL are the same you could use his formula to solve for BL rather than PL. Then the difference could be used to Counter Bore the barrel.
For Example:
PL: 20”
Counter Bore ID: .5”
Harmonic: 9th
Would give you a Counter Bore depth of 2.1” and thus a BL of 17.9”
Hopefully Tony will correct me if I am wrong:
Tony stated The PRX works best for barrels that are between 22” & 25” long.
The formula was built around the concept that the Physical Length is always longer than the Barrel Length (bolt to crown).
Next it assumes that the ID from the crown to the physical end is larger than to rifle bore.
Make Sense??
For a rifle where the PL & the BL are the same you could use his formula to solve for BL rather than PL. Then the difference could be used to Counter Bore the barrel.
For Example:
PL: 20”
Counter Bore ID: .5”
Harmonic: 9th
Would give you a Counter Bore depth of 2.1” and thus a BL of 17.9”
Last edited by a moderator:
Great explanation on figuring for the counter bore tune.
I have shyed away from posting about this, since it does require the barrel to be altered. All the other PRX tunes, if they don't work, you just go back to your original tune. No harm no foul
If I figure wrong on a counter bore tune, I've trashed a $400 barrel.. DOn't think I'm prepared for that.
I you are interested, I would suggest that you do the initial tune to the 9th harmonic. That way you can still trim the counter bore back to the higher harmonics, rather than try to counter bore again. Much bigger chance of something going wrong
Have a great nite
Tony
I have shyed away from posting about this, since it does require the barrel to be altered. All the other PRX tunes, if they don't work, you just go back to your original tune. No harm no foul
If I figure wrong on a counter bore tune, I've trashed a $400 barrel.. DOn't think I'm prepared for that.
I you are interested, I would suggest that you do the initial tune to the 9th harmonic. That way you can still trim the counter bore back to the higher harmonics, rather than try to counter bore again. Much bigger chance of something going wrong
Have a great nite
Tony