Dvus Posted June 16, 2022 Share Posted June 16, 2022 Hello all, and thank you for suffering through this noobs silly questions. I do appreciate any input, info and suggestions you can give me. I picked up this older STI build for what I thought was dirt cheap. I was expecting it to have issues because of the price, even though I went over it with a fine tooth comb. Surprisingly, it runs top notch. Came with 4 mags and all run flawlessly. My question is, what do I have? I was hoping someone could just rattle off what comp is on it and maybe what barrel. I know, more pics would help, but that will have to come later. Comp has 3 chambers, the only markings are .355 on the hood, it accepts long loaded 9mm bullets and there are no other holes. (popples?) Also, I have started a load workup with CFE and CCI magnum primers topped off with Xtreme plated 124 rn loaded to the same length that I load my standard 9mm for other guns. I have reached 7 gr. CFE so far with minimal pressure signs. I did notice at 6.8 gr. that the comp woke up and really started to do its thing, and group size shrank noticeably. I would like to get to 7.4 gr. just to be sure I'm hitting major (I know, use a chrony.) That's a plan for the future I guess. What do you all think? Link to comment Share on other sites More sharing options...
Nathanb Posted June 16, 2022 Share Posted June 16, 2022 Developing major ammo without a chrono is asking for trouble. Get the chrono. Link to comment Share on other sites More sharing options...
konkapot Posted June 16, 2022 Share Posted June 16, 2022 Unless you like blowing your gun up and hurting your face, +1 to getting a chrono, or borrowing one or something. That panel cut on the back of the slide gives me a Mark Krebs vibe; in time someone will be along to give a better answer. I'd also recommend getting screws in those holes on the mount asap. Link to comment Share on other sites More sharing options...
Dvus Posted June 16, 2022 Author Share Posted June 16, 2022 Yeah, I know, it's on the list. That's kinda why I've stopped at 7 grains and haven't pushed on yet. All of the pressure signs say I'm good where I'm at , so far. Link to comment Share on other sites More sharing options...
Dvus Posted June 16, 2022 Author Share Posted June 16, 2022 8 minutes ago, konkapot said: ...I'd also recommend getting screws in those holes on the mount asap. Got that part covered since the pics were taken. Link to comment Share on other sites More sharing options...
scooterj Posted June 16, 2022 Share Posted June 16, 2022 Are you sure that it’s 9mm? A gun of that vintage may be 38Super or 38Supercomp. All the barrels are the same until the gunsmith cuts the chamber. Link to comment Share on other sites More sharing options...
MikeBurgess Posted June 16, 2022 Share Posted June 16, 2022 that looks like a EGW comp on a bull barrel, Link to comment Share on other sites More sharing options...
Dvus Posted June 16, 2022 Author Share Posted June 16, 2022 1 hour ago, scooterj said: Are you sure that it’s 9mm? A gun of that vintage may be 38Super or 38Supercomp. All the barrels are the same until the gunsmith cuts the chamber. Yes, it is cut for 9mm. I thought that myself when I first saw it and double checked it, even though the previous owner told me it was a 9. Link to comment Share on other sites More sharing options...
dapribek Posted June 16, 2022 Share Posted June 16, 2022 Regarding your load, I believe you’ll get the best results from a light bullet. The comp works better with a light faster bullet. Hope this helps. Link to comment Share on other sites More sharing options...
Dvus Posted July 1, 2022 Author Share Posted July 1, 2022 Ok, so I worked my load up to 7.4 gr. CFE with 124 gr. Extreme bullets. Still no excessive pressure signs, comp is working great and I did chrono the load. 1,431 fps average, 28fps variation (1,426 low, and one jumped up to 1,454.) I think I will bring it back down to 7.2 gr., that will still keep me comfortably in major pf and seemed a little more accurate. Thank you all for your help. Link to comment Share on other sites More sharing options...
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