Rebating Rims - PPC Case + 223 Bolt Face Questions / Discussion

C

crb

Ray Brooks
I have a nice 6ppc bbl for my Remington. What I don't have is a bolt to match. I do have two 223 bolts, one std Remington and one PTG with a Sako extractor. I did some browsing here and found some threads with info so I decided to grind a HSS tool and do some experimenting.

Originally all I had was the std Rem 223 bolt which requires a more drastic cut on the PPC case. Now that I have a PTG bolt I could decrease the angle a bit. I could also do some machining on the PTG bolt nose to give more room for the PPC case body while still allowing use with 223 bbls.

Below is a pic of a sectioned PPC case after rebating the rim. Is there enough metal there to be safe ? The other pic is a rebated case in the PTG bolt. Comments and insight would be appreciated.

Thanks
Ray

6ppcsectionedrebated.jpg

6ppcserebatedcaseinptg.jpg
 
Wow, those PPC cases don't have much web thickness compared to a .223 case below:

sectioned%20case.jpg
 
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I think I value my eyes enough that I'd have a .223 bolt face opened up. At BR pressures I could see that web at the cut for the extractor groove blowing out. :eek: :(:(
 
Actually I would suggest if you want to use the 6mm barrel have it re chambered to 6mm BR for unturned Lapua brass and use an original 700 .308 bolt.
 
Lapua 220 russian case. I don't know how old it is. When I fire form my 6mm Beggs cases I will sacrifice one and compare as I know they are current production.
 
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I could shorten the bolt nose about .020" so the bolt face would be .120 deep instead of the current .140. Then the cut required on the PPC case would be much less drastic.

I also thought about opening this bolt up to the PPC size bolt face and adding a Sako extractor at the 6 o'clock position to create a drop port Rem 700. A fortunate happenstance is that the original 'pierced primer' vent hole is in the perfect location for the Sako extractor's retaining peg.

I don't think that would be wise because there is already enough metal removed from this bolt head with the 223's extractor cut.
 
crb said:
I have a nice 6ppc bbl for my Remington. What I don't have is a bolt to match. I do have two 223 bolts, one std Remington and one PTG with a Sako extractor. I did some browsing here and found some threads with info so I decided to grind a HSS tool and do some experimenting.

Originally all I had was the std Rem 223 bolt which requires a more drastic cut on the PPC case. Now that I have a PTG bolt I could decrease the angle a bit. I could also do some machining on the PTG bolt nose to give more room for the PPC case body while still allowing use with 223 bbls.

Below is a pic of a sectioned PPC case after rebating the rim. Is there enough metal there to be safe ? The other pic is a rebated case in the PTG bolt. Comments and insight would be appreciated.

Thanks
Ray
QUOTE]

Hi Ray,

Ive done the rebate thing, Remington .223 bolt face and Lapua 6PPC brass...........worked fine except that I was limited to about 28.0 grains/68gr.bullet of N133 before the prime pockets began to loosen due to the brass removal in the extractor groove area. Everything else works fine.

So if larger loads are anticipated, you may be limited..............Don
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Mr. Ray, can you believe that Mr. Dennis Sorensen is trying very hard to tell you something?

Mr. Ray, by looking at your sectioned brass, do you think that Mr. Dennis Sorensen is not worried?

Con
 
Con Cross said:
Mr. Ray, can you believe that Mr. Dennis Sorensen is trying very hard to tell you something?

Mr. Ray, by looking at your sectioned brass, do you think that Mr. Dennis Sorensen is not worried?

Con
Click to expand...

Are you Bill Calfee's centerfire alter ego :rolleyes:
 
That modified case is scary to me. Can't you reduce the rim and modify the bolt but NOT modify the case where the web is supposed to be? I won't say web of the case because there is none in that pic.
 
There is a reason I have not fired this set up yet :eek:. I am going to regrind my cutting tool and see if I can cut straight into the extractor groove without the large bevel in front of the ex groove. I am using a Wilson Trimmer case holder and rebating the rim is a piece of cake.

I could also cut a counterbore in the bolt nose. There is already a big bevel from the front face of the bolt nose down towards the bolt face with just the minimum amount of parallel section right at the bolt face.
 
I just did some memory refresh / parts measuring. You only have to reduce the dia of the extractor groove by .044, ie remove .022" of metal so it's not like that part of the deal is where the problem is. The problem is clearing the bolt face, that is why the big bevel is required. If I can reduce the size of the bevel it should work fine.
 
I fired this set up today AFTER I borrowed a Dremel to grind some clearance in my Lee Auto Prime's 223 shellholder !!!!! Fortunately one of the serious BR guys was at the range with his well equipped trailer. The reason that I didn't have any trouble with the reloading press shellholder is that my 223 shellholder already has been ground down about .020 ".

The rebated rims worked fine. I now need to do some load development.
 
I have fired many rebated head 220 Rus/6PPC cases in my rifles. The rifles all have bolts with face counterbore of .100" deep, not very much hanging out of the chamber with that depth counterbore. Primer pockets have not loosened up any quicker than a normal case head. I am not recommending anyone do it, this is just my experience.

For small aggs.

Steve Kostanich
 
I'd just as soon not be on the next beach when you shoot that rig,,,,,,,,,,ever wonder why a mfg doesn't offer that setup???? da,,,,,,,,,

the wind is my friend,,,,,,,,,

DD
 
david dumas said:
I'd just as soon not be on the next beach when you shoot that rig,,,,,,,,,,ever wonder why a mfg doesn't offer that setup???? da,,,,,,,,,

the wind is my friend,,,,,,,,,

DD
Click to expand...

I think you have it backwards, re-read, re-think.
 
Here is a pic of the finalized version of my rebated rim. Old on the right and new on the left. Lots more meat left in the case.

jhxbwp.jpg
 
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