Gunsmithing Boltface true?

[eddybo]

I was trueing an action today when it occured to me, what does it matter so long as the blotface is true. Why would anything else matter so long as you are getting decent lug contact and the boltface is true? Why wouldn't a remington that had the lugs lapped and the boltface trued to the action face actually be just as good as a completely trued action, assuming both are properly timed.

I have some of those carbide boltface trueing burrs, but have never tried them. I have to make a fixture to use them as I only have the burrs but might give them a try.

 

[flyboy]

Re: Boltface true?

I'm no smith but I would imagine that so long as you could asure that the bolt face was then trued to the action face (where barrel shoulder sits) that it wouldn't matter. but then is the chamber true to that?? I'm guessing the best bet is to true it all.

 

[shooter53]

Re: Boltface true?

eddybo,

If the bolt face is true and square but the face of the receiver has a 0.002" cante that means the barrel will be at an angle in relation to the bolt face thereby putting your chamber at the same angle. In effect, you have not accomplished a thing to improve your weapon's accuracy.

The purpose of truing an action is to ensure the bolt face is in perfect alignment with the chamber so the cartridge seats into the chamber perfectly straight. Any misalignment of the cartridge can cause decreased accuracy.

Hope that helps.

 

[eddieharren]

Re: Boltface true?

Carbide Trueing Burrs?

 

[wnroscoe]

Re: Boltface true?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DocEd</div><div class="ubbcode-body">Carbide Trueing Burrs? </div></div>

They're a flat tooling burr on a ground stem made by PTG. They’re part of a hand tool kit used to true receivers. A fixture screws into the receiver threads and the tooling burr stem is held in that fixture. The stem sticks out the face of the fixture while the flat burr is against the bolt face. The stem is turned and the flat burr cuts the bolt face.

Single point remains the prefered method IMHO.

 

[Raylawler]

Re: Boltface true?

Think about this... The scope sits on top of the action,you have it zeroed at 100 yards. If the front of the action is not square with the bolt ways and bolt, the barrel will be at some slight angle to the action. You will be able to get the point of impact to cross with each other at 100 yards, but the longer shots will not. For long range shooting the barrel, action, and scope must be lined up. It think having the front of the action square with the bolt and bolt ways and having the recoil lug flat and parallel are the two most important parts of truing an action.

 

[eddieharren]

Re: Boltface true?

Thank you William. Ol' Dave just keeps coming up with neat stuff.

 

[Hateca]

Re: Boltface true?

This has been beat to death before and no type of explaining it is going to convince someone to change their way of thinking.

In the big picture of tactical or field rifles you can get away with lots of things when it comes to building rifles that will never affect accuracy that anyone can see.

That being said any builder worth the money will true the action as much as possible to remove any doubt. Doing it half way or just doing one thing and not the other is just not the way most builders operate.

There are lots of machining methods that can be used that get the same results, so one can do what is comfortable for them based on the tooling they are using.

 

[eddybo]

Re: Boltface true?

Thanks for the replies. I do not do work for the public, and plan on continuing to fully true actions, but theoretically speaking I just do not see a difference. I was just wondering if there was something I missed, other than the scope alignment issue/ non issue.