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JMike

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About JMike

  • Birthday March 22

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    Winston-Salem, NC
  • Real Name
    Mike Loy

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  1. FrankD

    Thanks Mike for the information.

     My SVI is a early model with no holes in the barrel just a compensator.

    I tried 3N38 once with not much luck at 9.0 grs. SVI recommends 3n37 for barrels with just a compensator. I had better luck with 3N37with 9.2 grains using a 124 gr FMJ. I also tried Auto Comp with 6.0 grs. yesterday and its just not enough powder.

    SVI also recommends a 17lbs. hammer spring. The spring in the gun made the hammer very hard to pull back using your thumb. I installed a 15 lbs. spring with the Auto Comp at 6.1 grains.The max load according to Hodgdon Reloading Sheet is 6.3 grains. Seems to me still not enough powder.

    So I plan on going to 6.3 and 6.5 grs. of Auto Comp. Atlas Gunworks suggested Silhouette powder. He presently building me a 9mm IDPA/USPSA gun from a STI Frame Kit that I've had hanging around for a few years.

     

     

     

     

     

    1. JMike

      JMike

      Frank,

      Have you chrono's any of the loads you mention above? 

      The reason I ask is you should be up around 7-7.5 grains of AutoComp for a 124 gr bullet 38SC load. And I am currently loading 10 grains of 3N38 for a 124 gr bullet 38SC. Both of these loads make Major (evg of 170-175 PF) at an elevation of about 700 feet. 

      I would also go to a 7 or 8 lb recoil spring and change it every 5000 rounds or so. I am currently running a 7 lb spring in both of my STI open guns.

      Let me know off you need any other info and good luck!

       

      Mike

    2. FrankD

      FrankD

      Hi Mike,

      I really appreciate your assistance. This is my first Open gun. I have not chrono yet. I'm trying to narrow my types of powders down to three and go from there. I knew the AutoComp grains were too low after the first shot. What are you running for a hammer spring? Stock 17 lb spring?

      Thanks for the help,

      Frank

       

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