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hanexp

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  1. FrankD

    FrankD    hanexp

    Hi hanexp, You answered my email on troubleshooting my SVI open gun last month. I'm still playing with powder. I did use 3n38 and 3n37. The gun to my surprise didn't like the 3n38 starting with 9.0 grs. I when up to 10 grains with a hard hitting impact to the hand and muzzle flip.

    I had better luck with 3n37 which SVI's website recommends for guns with no holes in the barrel. Still fine tuning that powder.

    My gun does not have any holes in the barrel just a 3 hole comp. I noticed that the hammer spring take some effort to over come if you cock the gun by hand. SVI uses a 17 lb. hammer spring. I ordered a 15 and 17 lb. hammer springs from Dawson a few days ago. I think the hammer spring I removed took too much powder to overcome the spring that was in the gun.

    What is your thoughts on lowering the grains and going to a 15 lbs. spring. I was wondering if you ever went down this road with your gun?

    I think some of the information I provided was not clear on my part. I should have mentioned that the gun had no holes in the barrel.

     

    Thanks,

    Frank

    1. hanexp

      hanexp

      Hi,

      I use WAC for 9mm only. The advantage of 38SC is that with the longer case, you can load slower powders, like 3n38,N105 etc. With the commander length barrel in my 9mm shorty (not the SV), 7.0 g WAC, 125g JHP, OAL 1.625 gets me Major PF. In that gun, I use 7.5 with 115g JHP. I do prefer the 115g bullet load. YMMV in your gun, altitude, etc.

      3N37 is probably a great powder; I don't have any experience with it. With the 38SC (three holes), I like 3n38. N350 is pretty close to 3N38 in my pistol.

      I am interested in what Brandon's might suggest may be optimum for a barrel with no holes, if you learn anything. 

      Best,

       

      Blair

    2. (See 3 other replies to this status update)

  2. FrankD

    FrankD    hanexp

    Hi hanexp, You answered my email on troubleshooting my SVI open gun last month. I'm still playing with powder. I did use 3n38 and 3n37. The gun to my surprise didn't like the 3n38 starting with 9.0 grs. I when up to 10 grains with a hard hitting impact to the hand and muzzle flip.

    I had better luck with 3n37 which SVI's website recommends for guns with no holes in the barrel. Still fine tuning that powder.

    My gun does not have any holes in the barrel just a 3 hole comp. I noticed that the hammer spring take some effort to over come if you cock the gun by hand. SVI uses a 17 lb. hammer spring. I ordered a 15 and 17 lb. hammer springs from Dawson a few days ago. I think the hammer spring I removed took too much powder to overcome the spring that was in the gun.

    What is your thoughts on lowering the grains and going to a 15 lbs. spring. I was wondering if you ever went down this road with your gun?

    I think some of the information I provided was not clear on my part. I should have mentioned that the gun had no holes in the barrel.

     

    Thanks,

    Frank

    1. hanexp

      hanexp

      Frank,

      Thanks for your note. Just to put everything in perspective, I am really a strong C shooter who made B somehow early on. I've been shooting Open class for about three years.

      I shoot two open pistols, an SV Infinity IMM gun in 38SC with three holes in the barrel. As you know, this gun is mid-sized. My load is 10 - 10.5 g of 3N38, under a 124g JHP, OAL 1.235.

      I also shoot an STI frame shorty, commander length; it has no holes. For the shorty, I load 7.5g WAC under a 115g JHP.

      The recoil pulse is very different between the two

      The SV shoots flat but the recoil is fast and fairly violent. The Shorty is softer but flips more. I find the SV faster and more exciting to shoot. That said, the predictable softer shooting Shorty has it's own merit. On the clock there isn't a big difference. If I keep the shorty, I may experiment with a slower burning powder than WAC (maybe VV350 and HS6). I think the SV is optimized with my current load.

      Many comment that their SV (usually with holes) shoots flatter at 175 PF than at 165 PF.

      I have used a 19# MS. Put in a 17# and it has been reliable so far. I sense the lock time is quicker with the 19# when dry firing. Can't tell with live ammo. I think a 15# MS could result in an occasional light strike. I use a 7 or 8 pound recoil spring.I believe the force required to unlock the gun is also influenced by the radius/shape of the firing pin stop.

      Consider  emailing Brandon at Infinity for his recommendations for an SV with no holes. He knows what works best in his guns.

      YMMV, so start with lighter charges and work up. Wishing good luck with your SV Infinity. Great pistols!

      Blair

    2. (See 3 other replies to this status update)

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