Hi-Power Jack Posted April 29, 2009 Share Posted April 29, 2009 I just got my hands on some Montana Gold 115 Grain JHP 9mm's, and want to load them as major, using HS6 powder. What OAL would you use in an STI open gun (TruBor)? (I had been using 1.16" OAL with FMJ Zero's). Thanks, Jack Link to comment Share on other sites More sharing options...
yoshidaex Posted April 29, 2009 Share Posted April 29, 2009 1.16 oal with 9.1 - 9.2 grains of hs6. about a 172 pf. Link to comment Share on other sites More sharing options...
boz1911 Posted April 29, 2009 Share Posted April 29, 2009 What magazines are you using? Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 29, 2009 Author Share Posted April 29, 2009 I currently have four STI mags, but I ordered two SVI mags from Howard Smith last summer and two SVI mags a few days ago in case Howard's mags don't come in in time for the Nationals. Jack Link to comment Share on other sites More sharing options...
yoshidaex Posted April 30, 2009 Share Posted April 30, 2009 With SVI mags, you can run longer oal's. With the STI mags you're gonna need spacers so the bullets engage the ribs on the side properly on the way up. I have STI mags with stainless spacers which were tuned by Howard. At 1.16 oal, they run perfect. Any longer and they tend to have those mysterious jams once in a while. I've got SVI mags but haven't bothered finding the ideal length oal bullets for those mags. Link to comment Share on other sites More sharing options...
mikeAZ Posted May 3, 2009 Share Posted May 3, 2009 (edited) I'm at 1.18 to 1.20 with SV mags ... no problems, no spacers. (HS-6 also). NOTE: My "barrel" is throated!!, you MUST have at least .003 clearence / LOT's of pressure. I'd say my biggest problem is keeping track of the brass...., (I get all kinds of brass back, lot's of it is not mine... STAY away from S&B brass... (does't matter if it's brass plated or real brass..., pitch it). Edited May 3, 2009 by mike NM Link to comment Share on other sites More sharing options...
yoshidaex Posted May 3, 2009 Share Posted May 3, 2009 at 1.20 oal, how much hs6 do you need to hit a 170 pf for a 115 grain JHP bullet? Link to comment Share on other sites More sharing options...
pbosik Posted May 3, 2009 Share Posted May 3, 2009 (edited) that is pretty long, you need to make sure your barrel is cut that deep, i go no longer then 1.160 it will also depend on bullet overall length i.e 115 vs 125 i think the 115's would be shorter,,you might want to use what has worked for you before chrono and experiment with charge weight and length. i just went thru this and settled on shorter due to function. Edited May 3, 2009 by pbosik Link to comment Share on other sites More sharing options...
yoshidaex Posted May 3, 2009 Share Posted May 3, 2009 (edited) at a oal of 1.20 using a MG 115 jhp, i'm wondering how much contact area the bullet has with the case. Edited May 3, 2009 by yoshidaex Link to comment Share on other sites More sharing options...
n2ipsc Posted May 3, 2009 Share Posted May 3, 2009 1.170" OAL w/115 JHP's, 1.185" OAL w/115 FMJ's (MT Gold FMJ's run 0.012"-0.015" longer than JHP's - keeps ogive and base of bullet in same place). Both run flawlessly for me in unmodified SVI's and STI's w/spacers. Link to comment Share on other sites More sharing options...
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