Ruger chamber info Gathering thread

[68WJ]

I've updated the packet with a drawing that shows H's adjusted neck dimensions. I used .3095 and .309. H does this sound good?

What they probably need is 1 chamber suggestion from the "community" with a consensus as to what works well, and why.

BTW: I added the original link to an e-mail response draft. After you made the change, it no longer works. I don't want to send a bad link so I will wait until revisions are complete. Once sent, please don't change anything to prevent having a dead-end.

[Ratdog68]

What they probably need is 1 chamber suggestion from the "community" with a consensus as to what works well, and why.

BTW: I added the original link to an e-mail response draft. After you made the change, it no longer works. I don't want to send a bad link so I will wait until revisions are complete. Once sent, please don't change anything to prevent having a dead-end.

Agreed, and it wouldn't be a bad idea to have H double check the drawing to be passed along before being passed on to Ruger to review/study.

[T.Rexford]

Agreed, and it wouldn't be a bad idea to have H double check the drawing to be passed along before being passed on to Ruger to review/study.

Thats a must. It needs to be signed off by somebody other than a knifemaker.... BTW I just did s imple photoshop on it. No need to reproduce a whole drawing for just 2 changes.

[Ratdog68]

Thats a must. It needs to be signed off by somebody other than a knifemaker.... BTW I just did s imple photoshop on it. No need to reproduce a whole drawing for just 2 changes.

I would think a solid SPC II that is industry standard is the way to go.

BTW... thank you for hosting the material for us. Mucho appreciated !!!

[EWP]

I see no need to enlarge the neck dia, the only chamber to ever have a problem with brass neck thickness was the DMR chamber which had a smaller neck, the larger neck will just cause an already loose and off center bullet to be even worse, the original chamber will be more accurate.

I've never seen brass with over a .015" thick neck max and even that is plenty small for a .308 chamber neck.

I say use the original spc-II reamer drawing that SSA approves and most companies use which was posted first. JMO

ETA: Also the dimensions on the spc-II reamer in the packet are not correct, it shows the groove dia as .28 instead of .277 and some of the others are rounded off, I would make sure to include a copy that is as exact as possible.

PTG_68_SPCII_Reamer.pdf

[MCA]

I see no need to enlarge the neck dia, the only chamber to ever have a problem with brass neck thickness was the DMR chamber which had a smaller neck, the larger neck will just cause an already loose and off center bullet to be even worse, the original chamber will be more accurate.

I've never seen brass with over a .015" thick neck max and even that is plenty small for a .308 chamber neck.

I say use the original spc-II reamer drawing that SSA approves and most companies use which was posted first. JMO

Agreed - I've not had a problem even with the DMR-C once getting rid of the over-size (as high as .309) problem that SSA ran into in early to mid-2009.

[mohunter55]

I'd vote to use the drawing that Ben posted. It seems its already set up as the somewhat spec II standard and would be easier to get ruger to agree to.

[WVHunter1s1k]

WOOOHOOO!! That is progress!!!

IMHO, The link of Harrison's breakdown is great!! But, Art HTR, Harrison, EWP or or an SSA/Hornady rep will need to send a Schematic of the correct SPEC II Chamber. Also, don't forget to mention barrel twist!!

I'm just a DHHR Social Worker & have not built my rifle yet (I have a list of about 80% of components needed). About as far away from Firearm's Engineer as you can get. So, all I can give is moral support.

[EWP]

I'd vote to use the drawing that Ben posted. It seems its already set up as the somewhat spec II standard and would be easier to get ruger to agree to.

Thats the same one I posted and agree it should be the spc-II standard, pretty sure WC & WOA uses the same reamer as well.

[HTR]

I too, agree that we don't need a larger throat diameter than .308" but then again, I don't build rifles, either.

Yes, we previously saw some brass that had thick necks, but I own an original DMR chambered ARP rifle and have never had any problems with it, and I don't even turn the necks. This tells me that this was an isolated problem with the brass.

All the new brass I have gotten recently (the last year) from SSA, is within Spec. I am sure that we would see worse accuracy with the .310 necks.

Having said all of the above, I would rely on Harrison to oversee the drawing we send to Ruger.