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1950 mk7 DA |
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britrifles 
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Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 5602 |
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 Posted: March 18 2022 at 1:48pm |
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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
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Joined: April 23 2021 Location: Canada Status: Offline Points: 137 |
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Posted: March 18 2022 at 4:05pm |
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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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Goosic
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Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8174 |
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Posted: March 18 2022 at 5:04pm |
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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
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Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 5602 |
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Posted: March 19 2022 at 2:02am |
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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bubba ho tep
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Joined: June 19 2017 Location: KY abode Status: Offline Points: 169 |
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Posted: March 19 2022 at 7:33am |
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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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bubba ho tep
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Joined: June 19 2017 Location: KY abode Status: Offline Points: 169 |
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Posted: March 19 2022 at 7:35am |
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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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Olddust wrote: