A moron and his uni-throater...

[Mike D Texas]

Did that, I'm cutting I can tell by the swarf/chips. No increase in CBTO.

How are you verifying this?

 

[Bob Wright]

i just played in my quickdesign with changing angle and it will take .113 give or take just to change the angle before lengthening the freebore

I didn't trig it out, but computer graphics is a sweet tool.
It shows the far end of the lead getting reamed first, correct?

 

[deadidarren]

I would have thought it would be removing material from the end closest to the mouth of the case first would be impossible for it to do the far end first

 

[Rhett Crider]

It would be. The bullet profile is what is creating this scenario. Hybrid/ VLD ogive touches at the base of the lead whereas a round nose would contact the beginning. His throat reamer has steeper lead angle that hasn't reached the base of the original lead yet but his bullet in the comparator is still contacting the original base of lead so reading the same. Basically, his factory lead angle is twice as long as the throat reamers lead angle. At least that's what it appears to be.

 

[cohunt]

I agree with the "angle" throry, It makes sense .....if the chamber is 3 degrees and the cutter is less then you are cutting the front and not where your bullet is touching --- did you get any info from ptg to verify?

 

[Rhett Crider]

Pretty much what Can1010 is talking about

 

[brguide]

Get you a bore scope so you can see what you are cutting. That way you can tell what is going on. You can find them on Amazon for around 100.00

 

[Chris Montana]

make another dummy with a shorter case?

 

[Harry Knutz]

Lick a few more frogs, Drink a few more shots of Rye, And get busy, I'm sure it will come out fine

 

[lyle2231]

Did that, I'm cutting I can tell by the swarf/chips. No increase in CBTO.

My limited knowledge… sounds like you're creating greater head space. Just sayin'…,

 

[TXTrained]

If a window licker grabbed himself a uni-throater, made a dummy round of his desired cbto/coal, and got medieval on his barrel and throughout the process never got to the point where his freebore has increased at all...what has occurred?

Spoiler Alert: I'm that window licker. I've checked repeatedly with the dummy round and a bullet comparator and nothing has changed. And I'm still a window licker, that didn't change either.

Sometime people attempt to fix things they are not really

If a window licker grabbed himself a uni-throater, made a dummy round of his desired cbto/coal, and got medieval on his barrel and throughout the process never got to the point where his freebore has increased at all...what has occurred?

Spoiler Alert: I'm that window licker. I've checked repeatedly with the dummy round and a bullet comparator and nothing has changed. And I'm still a window licker,

If a window licker grabbed himself a uni-throater, made a dummy round of his desired cbto/coal, and got medieval on his barrel and throughout the process never got to the point where his freebore has increased at all...what has occurred?

Spoiler Alert: I'm that window licker. I've checked repeatedly with the dummy round and a bullet comparator and nothing has changed. And I'm still a window licker, that didn't change either.

I don't really like saying this..However sometimes people attempt to work on things they are not really qualified to do.And they usually mess it up .In an attempt to save a little bit of money when it would probably been even cheaper to have a Pro do it. Sometimes they get lucky and it comes out just right.I hope it dies in your case.

 

[Harry Knutz]

My limited knowledge… sounds like you're creating greater head space. Just sayin'…,

A Uni throater will not change headspace, It does nothing to the datum.

 

[Willys]

Last month I got back my 338 Lapua AI a year in the making with 3.900 reamer and unithroater to 3.965 oal 300 Bergers from CNC gunsmith. Proof barrel. Measured with hornady tool just touching the lands are 3.900 not 3.965. But Measured by jamming light tension round lands are 4.100 ! Measured Wheeler method lands are 3.800 Looking at with scope I can clearly see the freebore to the lands at .625.

Soooo….. with long taper bullets, tight bore, worn reamer, and unithroater your lands can be a moving target - up to .200 just by amount of pressure on your gage.

 

[PCF]

Is it a 5 groove barrel?