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1950 mk7 DA

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britrifles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: March 18 2022 at 1:48pm
Yup, I did the same thing to my F/L sizing die.  

I also bought a -0.001 inch undersize .303 mandrel from Lee for use in the collet neck sizing die to get a bit more neck tension.  
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Olddust View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Olddust Quote  Post ReplyReply Direct Link To This Post Posted: March 18 2022 at 4:05pm

If “crimping is detrimental to accuracy”, not crimping the 7.62 loads I made up would make them shoot even better? The 39.5 grain load was 1-1.5 moa and the 40.5 was 1.0 moa 
 What improvements should I expect with not using my collet crimp die?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: March 18 2022 at 5:04pm
Using the crimp puts more tension on the bullet reducing accuracy especially with the 7.62mm. The accuracy load for the 7.62mm/.308 from what I have learned is 42.0grns of IMR4895 using the 168grn HPBT SMK. OAL of 2.83" with absolutely no crimp...
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britrifles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2022 at 2:02am
Originally posted by Olddust Olddust wrote:


If “crimping is detrimental to accuracy”, not crimping the 7.62 loads I made up would make them shoot even better? The 39.5 grain load was 1-1.5 moa and the 40.5 was 1.0 moa 
 What improvements should I expect with not using my collet crimp die?


You may get sub-MOA groups.  When the barrel in my .303 Fulton No. 4 was fairly new, it gave 10 shot groups off the bench under 1 MOA with handloads and no crimp.  With crimp, just over 1 MOA. 

The crimp die will give varying amounts of crimp (neck tension) depending on case length.  Variability is detrimental to accuracy. You will never see a bench rest shooter use a crimp die. 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bubba ho tep Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2022 at 7:33am
I crimp all my cartridges , especially the 7,62 nato as I utilize them in L1A1's , HK and now an M1A. As well I always use a size trim die so ALL of my brass in any given caliber I have such a die for is absolutely consistent in length.   I do so for even 303 as it is not hard in an enfield to knock a bullet in the case with rapid bolt manipulation. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bubba ho tep Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2022 at 7:35am
I don't have accuracy issues crimping...but I am also not shooting for  1 MOA or less. When I have sought super duper accuracy I have "soft loaded " rounds and it's a hard benchrest method to beat but does incur a marked pressure jump . 
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