Gunsmithing Need some technical help here with headspacing – Stiller Actions using a Remage Barrel

[Marksman]

A little background first. For some time now I’ve wanted to build a custom 221 Fireball Repeater, but they haven’t been known to operate smoothly. Essentially, a standard Remington bolt, because of it’s extractor location, drags the spent case along the action lug where it usually pops off the bolt prematurely before it’s been ejected. To get around this Remington moved the ejector location to keep this from happening. This post explains it in much better detail.
http://www.snipershide.com/shooting...ion-rifles/35474-221-fireball.html#post494263
While looking at custom actions, I noticed that the Stiller Predator 223 action has a Sako style extractor which would essentially solve the ejection problem (I assume).

After seeing the Stiller/Remage build from another thread I really started wanting to do one myself. Because the Stiller Predator is a 700 clone, I was thinking I could get a prefit “Remage” barrel and screw it in this action and be set. This is where I started confusing myself. I realize that a Remington 700 tenon looks like this:

http://www.riflebarrels.com/products/pdf_barrel_drawings/pre_threads_pdf/rem_700_thread.PDF

But from the Stiller website, the required tenon looks like this:

http://www.viperactions.com/files/predator_tenon.pdf

The first thing my untrained eye noticed is that the diameter of the counterbore on the Remington tenon is 0.705” and the counterbore on the Stiller is 0.740”. Does this mean if I screwed a Remington barrel on the Stiller action, the barrel would stop at the bolt face instead of allowing the bolt face to slide into the counterbore? Therefore headspacing incorrectly?

This leads in to part 2 of my question, and further lack of gunsmithing knowledge. Because I don’t know the correct terminology, I’ll refer to this drawing which is one I modified from Varmint Al’s website.

http://i7.photobucket.com/albums/y295/Marksman6mmbr/Firearms/VarmintAlsPhotoModified_zpsa766b43c.png

Is the distance “X” from the face of the bolt to the end of bolt tenon assumed to be the same between Factory Remington bolts and Custom/PTG bolts? It seems like if the Remage barrels are set of for a depth of a factory Remington bolt, if screwed onto an action with a different bolt with a different depth, that too would screw up the headspacing?

 

[NXS338]

Have you measured your bolt head? what does it measure? The .740 is to fit the stiller bolt head I believe and the .705 is to fit stock remington bolt head. You can measure all of this and answer all of these questions yourself. The "x" dimension your asking about can also be measured, what does your bolt measure?

 

[Killswitch Engage]

stiller short action does not take .740 to fit their bolt head. standard rem counter bore cut will work fine with it. i cut the last one at .710
the oversize is for the magnums. the drawing isnt real clear on that but you can ask jerry or russ about it if you want.

next, the counter bore depth for the ptg bolt/stiller action is "close" to the same as a rem 700 unmolested model. it is possble however to run into a clearance issue dpending on what protrusion the barrel was chambered to along with tenon thread fitment. these arent legos or modular set ups. i realize you want to save money and be able to swap barrels etc but there is really no gaurantee until you try to fit them together.