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This is as good as it gets.
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Goosic View Drop Down
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    Posted: November 04 2020 at 9:40am
I went to the range this morning.  This was all done at 100 yards. 
There was no issues with the handload and I believe headspacing is spot-on. 
It is not a tack-driver and never will be.. It will get bullets down range expeditiously however. 
It was interesting to note that the fired case slipped into the case gauge without so much of a hiccup and it only stretched  .010" according to the headspace comparator and an unfired round. The handload of 41.7grns of IMR4064 topped with a 168grn BTHP and primed with Federal GM215M primers did as expected given the equipment used. My test and tune is complete. 

The target shows only nine holes. The hole on the bottom left is actually three holes combined. It is a ten shot group...
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I think you have it nailed.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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That looks like a great job. Well done.
How does the recoil compare using this load to the standard .303 rifles ?
Have you chronographed these rounds yet?
It's nice to be important, but it's more important to be nice!
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That'll do...
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If you subsequently neck size, you probably won’t see much change in case headspace length. 

Were the primers removed before you measured the case headspace on the fired cases? 
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Goosic View Drop Down
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Originally posted by Zed Zed wrote:

That looks like a great job. Well done.
How does the recoil compare using this load to the standard .303 rifles ?
Have you chronographed these rounds yet?
 
As far as recoil is concerned Zed, it is very manageable for a .308 and noticeably far less than the 303 British round.
  I have chronographed these particular rounds and from an average of ten shots with the chronograph 8 feet from the muzzle I got a 2548 result 
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Goosic View Drop Down
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Originally posted by britrifles britrifles wrote:

If you subsequently neck size, you probably won’t see much change in case headspace length. 

Were the primers removed before you measured the case headspace on the fired cases? 
 
No, the primer was not removed.  The photo of the fired case was taken moments after being removed from the rifle.
I have given though to neck sizing for this rifle but I am at odds with myself about it currently. 
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Sometimes the fired primer will protrude slightly giving a false headspace measurement of the case. Check it again after you de-prime.  Then use that measurement and subtract 0.002 to 0.004 inches as your target case headspace length after a partial length resize.  You might want to measure all 10 cases to see what the longest case length is.  

0.010 is a fair bit of case elongation.  SAAMI spec drawings show a minimum length case headspace of 1.627 and maximum length chamber is 1.640 (a difference of .013 inches for .308 Win).  

I’ve measured several cases fired from my DCRA conversion using the Hornady case headspace comparator with the “D” bushing and they all measure 1.625. A few samples of the 1959 and 1962 DA 7.62 unfired cartridge cases measured 1.620.  So I’m getting about 0.005 inch elongation after numerous firings (not sure how many neck size cycles on this brass.  Might be the thicker brass resisting elongation better?

My Manson .308 “GO” gage measures 1.622 in. and “NO GO” measures 1.628 with the Hornady headspace comparator.   The bolt does not close on the “NO GO” gage. 

 I would not put a lot of confidence in these measurements as absolute (for they are not), but good for comparison measurements between fired and unfired case lengths, headspace gages etc. 

Certainly minimizing the number of FL resizing cycles (particularly if the brass elongates by 0.010) will lengthen the life of the brass.  That’s why I neck size until I feel slight resistance to fully locking the bolt.
 
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Points: 8842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: November 04 2020 at 7:59pm
I deprimed ten cases. All ten cases measure 1.631".
My Forster Go gauge measures 1.625" and my Forster No-Go measures 1.629". A full length resized case measures 1.621". This is using the "D" bushing that you describe in all my measurements.
 Remember that this 2A1 Ishapore barrel is chambered for the 7.62x51mm NATO cartridge and not for a commercial  .308 Winchester round and I honestly believe that a 0.010" difference in length after firing is well within SAAMI specifications. I am using 2014 date stamped Lake City brass and just from the testing I did today has shown no signs of potential case separation, primer deformations, over pressure signs around the case itself, or any other irregularities. I did this same test using my M700P for comparison and the difference is .002" in favor of the Enfield. 
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Points: 8404 		Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 05 2020 at 2:49pm
OK, good to see this data for comparisons.  What are the advertised dimensions of the Forester gages?  We are getting pretty similar measurements with our Hornady comparators.  

So, are the cases lengthening more in your M700P?  Is so, then I would agree, you have no issues whatsoever with the No. 4 conversion.  

If it were me, I would adjust your FL sizing die to only shorten the fired case headspace by .002 to .004, there is really no need to push the shoulder back further unless you are firing these cartridges from multiple rifles, in which case you probably want to size back to conform to your case gage. 
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The Go gauge is 1.630"
The No-Go gauge is 1.634"
The Field gauge is 1.638"
The case lengthening is more pronounced in the M700P. 
I full length resize all my brass because I have five rifles that are the same caliber. 
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