Purdy Rx calculator

[Mark4470]

old topic new question. I have a new barrel that is not installed on an action currenty. The total length of the barrel is 26 1/16” long .900 straight. What should my tuner length be according to this method? I know it’s a ballpark. Thanks!

 

[PWNolan]

old topic new question. I have a new barrel that is not installed on an action currenty. The total length of the barrel is 26 1/16” long .900 straight. What should my tuner length be according to this method? I know it’s a ballpark. Thanks!

Is the new barrel finished or a blank?

 

[Mark4470]

Is the new barrel finished or a blank?

Langley just finished it.

 

[rodstreet]

old topic new question. I have a new barrel that is not installed on an action currenty. The total length of the barrel is 26 1/16” long .900 straight. What should my tuner length be according to this method? I know it’s a ballpark. Thanks!

Ballpark guess 29” from closed bolt face to end of tuner. I would suggest using a tuner weight. (Extension) to get that length. I can’t get the Purdy spread sheet to work. I’ve sent you the Purdy RX instructions via DM on Rimfire Accuracy site so you can get a more precise answer.

 

[rodstreet]

Here it is again. Pages may not be in order

 

[Hi-NV Shooter]

old topic new question. I have a new barrel that is not installed on an action currenty. The total length of the barrel is 26 1/16” long .900 straight. What should my tuner length be according to this method? I know it’s a ballpark. Thanks!

Mark,

Barrel 26.0625 divide by 8= 3.2578125 x 9 = 29.320312 - 26.0625=3.257812 tuner length you need to subtract .402 most likely as the EC would use the threaded part of the tuner where weights screw on plus the crown depth this will give you the tuner length from the end of the barrel to the end of the tuner.

FYI, I don't believe in using this method to tune as I believe presetting the tuner will overlook a better setting possibly at least from my past experiences.

Lee

 

[Mark4470]

Mark,

Barrel 26.0625 divide by 8= 3.2578125 x 9 = 29.320312 - 26.0625=3.257812 tuner length you need to subtract .402 most likely as the EC would use the threaded part of the tuner where weights screw on plus the crown depth this will give you the tuner length from the end of the barrel to the end of the tuner.

FYI, I don't believe in using this method to tune as I believe presetting the tuner will overlook a better setting possibly at least from my past experiences.

Lee

Lee,
I’m just going to give it a shot. I appreciate you doing the calculation for me!
Mark

 

[Tlyons68]

View attachment 1483840

HOW DO I GET THIS TOOL?

 

[gunsandgunsmithing]

I haven't used it in a long while but there used to be a sticky thread on rimfire central that had the program in it to calculate it yourself, with your specific numbers. EC is different on some tuners. Not knocking it but I did a fair bit of testing and found I could tune with or without prx, just as well. YMMV.

 

[PWNolan]

I haven't used it in a long while but there used to be a sticky thread on rimfire central that had the program in it to calculate it yourself, with your specific numbers. EC is different on some tuners. Not knocking it but I did a fair bit of testing and found I could tune with or without prx, just as well. YMMV.

The link to the spreadsheet is at the very bottom of Tony's post

The Purdy Prescription___(the Rx for tuning your tuner)

The Purdy Prescription Thank You for giving my idea a try. Together we will work thru what I believe will be an effective, if not best, tune for your rifle. My tuning is based on the harmonics that develop in a closed end tube when excited, and putting the muzzle at the even quarter wave in...

www.rimfirecentral.com