How NOT to validate your chambering job

[LVLAaron]

@INTJ - I was talking about the Mitutoyo 513-504 with a super long stylus. It just doesn't work.

 

[Alex Wheeler]

Alex,

This is a fun and worthwhile discussion for those of us who are still developing our technique. I can see how these discussions aren't much interest to you or other accomplished rifle builders since you have it sorted out. It's the same reason I don't post on aviation forums.

However, on this topic, I find the back and forth of great value. We don't really get good info unless we challenge each other a bit. That said my original intent here was to be a bit humorous about the tape in my chamber.

I wasn't trying to draw you in, but I thought it a courtesy to tag you since I was going to mention you. I was thinking of your description of dialing in on your website when I mentioned you.

No, its a pointless discussion that will never end. I just told you exactly how to test the different methods so you will know how good they work. Getting on here trying to convince others that this way or that way is better is a waste of time.

 

[LVLAaron]

Arguing with an engineer is like mud wrestling a pig...
You'll never win and eventually you'll figure out that the pig likes it.

 

[ronsatspokane]

Arguing with an engineer is like mud wrestling a pig...
You'll never win and eventually you'll figure out that the pig likes it.

We're all pigs here to varying degrees.

Too muddy the topic further, who is using a solid pilot reamer and who is using a bushing reamer. I see problems well beyond indicating. I order the bushing set and use the bushing that best fits the barrel on both the indicator rod and the reamer. Yeah, there is the potential for slop between the bushing and the rod or the reamer but quality components should minimize that. How do the pros mitigate the errors in the reamer in addition to the errors in indicating. Do the errors cancel?

 

[LVLAaron]

The pilot shouldn't be doing anything if everything is set up correctly. Sometimes I don't use one. I will on a 5R.

 

[INTJ]

@INTJ - I was talking about the Mitutoyo 513-504 with a super long stylus. It just doesn't work.

I agree with that. I tried it myself and the marks are just too small.

 

[INTJ]

No, its a pointless discussion that will never end. I just told you exactly how to test the different methods so you will know how good they work. Getting on here trying to convince others that this way or that way is better is a waste of time.

No to belabor this, and I do agree that it is pointless to try and convince others that a certain way is best.

However, we aren't trying to convince anyone of anything--at least I am not. We are discussing pros and cons of the various ways, and I think that is valuable for those of us fairly new to chambering barrels. I have picked up some bits of info here that I hadn't thought of.

The only other way, especially when you are starting from zero, is to ask help directly from those who are very accomplished, and that is card that has to be carefully played lest that card becomes depleted. By discussing these things on the forum, the highly accomplished will participate if they want and won't if they don't.

 

[Alex Wheeler]

My point is, knowing how to test the different methods is far more valuable than me telling someone how i do it. One guy may get real good with a long stem, the next guy may get better results with a rod. I have preferences on how to do it but if the next guy cant duplicate the results its not the best way for him. So my advice is dial in your crowns every way you can, then check the results with your true .0001 indicator and use the method that gives you the best results repeatably. I have always felt the learning process makes you actually understand why your doing something.

 

[GenePoole]

A few weeks ago, the debate was 5R and chatter. I mentioned in the thread (don't remember which so I'm posting here) that I'd never had an issue, and I promised to make some video the next time a 5R came across my lathe.

As luck would have it, a job came to the shop, a Savage 110 6.5 Creedmoor from a guy I shoot F-Class with. His factory barrel was good for about 6 shots before it became a scattergun. I offered to replace it with a quality barrel. I had a 6.5 in stock and spun it up.

I've got about 1.5 hours of video and audio from my lapel mic that I need to sync and edit if I want to make a full video of the chambering, but for now, here's a couple of teasers. Spoiler alert: nothing happened in any way different than any other barrel I've chambered.

 

[LVLAaron]

Check it up by the neck/freebore.

 

[DaveTooley]

My point is, knowing how to test the different methods is far more valuable than me telling someone how i do it. One guy may get real good with a long stem, the next guy may get better results with a rod. I have preferences on how to do it but if the next guy cant duplicate the results its not the best way for him. So my advice is dial in your crowns every way you can, then check the results with your true .0001 indicator and use the method that gives you the best results repeatably. I have always felt the learning process makes you actually understand why your doing something.

Ah "The why" we do things. Intriguing concept.

 

[Carl S]

No, its a pointless discussion that will never end. I just told you exactly how to test the different methods so you will know how good they work. Getting on here trying to convince others that this way or that way is better is a waste of time.

I agree Alex.everyone has different ways of doing things and you won't convince everyone a certain way is correct.what suits one doesn't suit another.i think as long as a chosen method suits the individual and the job he or she does comes out correctly and they and the customer are happy..thats key.some like blondes some like brunettes some like both.people are different.one thing I have learned in life is..you never stop learning.