Hi-Power Jack Posted November 30, 2008 Share Posted November 30, 2008 I know we're not supposed to use FMJ in an open gun, but I have to load some up real quick, and don't have any JHP's left. With 8.5 gr HS6 powder (1460 fps) what OAL should I be looking at ? 1.20" sound about right? This will be shot in my TruBor. (I'll also work up to the 8.5 gr HS6 slowly). Thanks, Jack Link to comment Share on other sites More sharing options...
JThompson Posted November 30, 2008 Share Posted November 30, 2008 (edited) I know we're not supposed to use FMJ in an open gun, but I have to load some up real quick, and don't have any JHP's left. With 8.5 gr HS6 powder (1460 fps) what OAL should I be looking at ? 1.20" sound about right? This will be shot in my TruBor. (I'll also work up to the 8.5 gr HS6 slowly). Thanks, Jack 1.165-1.170 EDIT: Don't know about the powder charge. Edited November 30, 2008 by JThompson Link to comment Share on other sites More sharing options...
HSMITH Posted November 30, 2008 Share Posted November 30, 2008 If you are running spacer mags load at 1.15-1.165", if you are running mags without spacers load at 1.175-1.18". Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted November 30, 2008 Author Share Posted November 30, 2008 If you are running spacer mags load at 1.15-1.165", if you are running mags without spacers load at 1.175-1.18". I'll try the 1.16" and see how they work. Thanks, Jack Link to comment Share on other sites More sharing options...
bwit Posted November 30, 2008 Share Posted November 30, 2008 Hipower, I've been shooting a .38 super open with open base bullets and I can't find any residue in my comp except a bit of powder Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted November 30, 2008 Author Share Posted November 30, 2008 Hipower, I've been shooting a .38 super open with open base bullets and I can't find any residue in my comp except a bit of powder I tried a few thousand of the Open Based Bullets (actually the 115 gr Zero FMJ's that I'm going to use tomorrow), and after a few thousand, I noticed that I had lost some accuracy with the new TruBor. I had read about the problem, so I scrubbed up the comp, and Voila, the accuracy was back:))) I actually met a young gentleman who was shooting "LEAD" bullets thru his comp in competition - he said he cleaned his comp often, and had no problems with it ... But, I'm going to stick to the JHP's as soon as they come in. Thanks for the help. Jack Link to comment Share on other sites More sharing options...
yoshidaex Posted December 1, 2008 Share Posted December 1, 2008 (edited) YMMV but I use a 115 grain JHP (Zero brand bullets) with 9.1 grains of HS6 at a OAL of 1.17~1.18 to acheive a PF of 170. Edited December 1, 2008 by yoshidaex Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted December 1, 2008 Author Share Posted December 1, 2008 YMMV but I use a 115 grain JHP (Zero brand bullets) with 9.1 grains of HS6 at a OAL of 1.17~1.18 to acheive a PF of 170. I'm going to work up, slowly, from 8.0 grains, and chrono them - when I get to 170, I'll stop, but I don't think I needed over 8.5 last time - that's with the 5" STI TruBor. Do you have a short barrel? But, thanks. Jack Link to comment Share on other sites More sharing options...
yoshidaex Posted December 1, 2008 Share Posted December 1, 2008 (edited) 3 of the open guns I have are 5 inchers. All 3 show different velocities with the same load. The fastest velocity is out of a 5" no barrel port, schueman ultimatch barrel. The slowest is a 5" with 2 popple holes and is a standard schueman barrel. The in betweener is a 5" with a STI barrel and no barrel ports. Just goes to show one load can vary quite a lot between multiple guns. Edited December 1, 2008 by yoshidaex Link to comment Share on other sites More sharing options...
JThompson Posted December 1, 2008 Share Posted December 1, 2008 YMMV but I use a 115 grain JHP (Zero brand bullets) with 9.1 grains of HS6 at a OAL of 1.17~1.18 to acheive a PF of 170. I'm going to work up, slowly, from 8.0 grains, and chrono them - when I get to 170, I'll stop, but I don't think I needed over 8.5 last time - that's with the 5" STI TruBor. Do you have a short barrel? But, thanks. Jack I would start under 8... A lot of people have made major in the high 7s Link to comment Share on other sites More sharing options...
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