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About Longranger

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  1. PK90, I've had a standalone Snap-On borescope for a long time. It came with a small tip, a large tip, and 90-degree adapters for looking sideways instead of straight ahead. It records video or photos onto an SD-card. I think there's been lots of progress in the tech since I bought that and there are now some pretty fancy USB borescopes available. Prices vary all over the board. -Longranger
  2. Hodgdon website says COL for the 115gr LRN loaded with Titegroup is 1.100. You're pretty much right there at 1.103. -Longranger
  3. Do you have load data for the ibjiheads bullets and titegroup? It's generally not a good idea to just change bullets and expect the same recipe to apply. Sounds like the coated bullets have a much more round profile than the FMJs. -Longranger
  4. If the Tool Craft and PSA are both full auto spec, they're probably the same weight. Oh well. If the SPR gas rings test ok, no leaks in the gas system, gas block is properly aligned to the gas port, and the gas port is not undersize or partially clogged, I think you're down to lightening the buffer or running the 55gr ammo with a heavier charge than the recommended max. I'm curious to hear what you decide to settle on. -Longranger
  5. MartyZ, You did say in your original post that you had checked the gun. Did you test or check the gas rings? Are the BCGs in all your ARs the same weight? I wonder if the SPR BCG is a touch heavier than the others and maybe a little swapping around will get you all guns working with all ammo. -Longranger
  6. I agree 100%. I'm only saying that a 55gr @ 3224fps has the same kinetic energy as a 68gr at 2900fps. Same amount of work was done on the bullet. Different powders, different burn rates, different length of time in the barrel (before and after the gas port), and different pressure/time curves. -Longranger
  7. Well, it sounds like you need to decide if you want to lighten the rifle buffer weight a little and have a bit more recoil on all your other loads just to have consistent locking with the 55gr at the lower charge or run the 55gr above the recommended max charge or just save the 55gr ammo for the carbines. Your call. I'd use the 55gr ammo in the carbines. -Longranger
  8. Barrel nut ID maybe 1.190"? Even better. Do you need to be a gunsmith in NJ to open up a barrel nut ID on a lathe? -Longranger
  9. Dang! ID on the barrel nut is what, 1.182"? So it would just clear if you took 0.018" off the comp OD? Or, opened the ID of your barrel nut 0.018"? 0.009" off the thread height. -Longranger
  10. Tony13, My first thought is that the weld material covering the pin should be aluminum since the comp is aluminum. A drill should be able to get through that, but you run the risk of breaking the drill bit off when it gets through the aluminum and encounters the pin. I'd try operating on the weld with a Dremel tool or a jeweler's file to get to the pin. Remove enough material to expose the full diameter of the pin. Hopefully it's a roll pin and not a solid pin, right? And it's likely in a blind hole. And it's likely made of spring steel. Trying to screw a tap or screw into the pin usually doesn't work. Pack as much grease into the pin as you can. Or, maybe drops of oil if you have zero luck with the grease. Find a pin punch that's a close fit to the inside diameter of the pin, put it into the center of the pin and deliver a sharp smack to the grease or oil. The hydraulic pressure will force the pin out. I've done this with bushings in blind holes before and this is like a miniature version of that process. DON'T FORGET TO PUT YOUR EYE PRO ON FIRST! -Longranger
  11. Very good! Thanks for the update. -Longranger
  12. Interesting. SAAMI spec on case OAL is 1.730"-1.760". So, there's still a little room to go lower if needed. I'm curious to hear the post-weekend report. Is your SPR chambered for .223 Rem, 5.56, or .223 Wylde? Just thinking about any differences in chamber volume (albeit small) that might be in play here as well. -Longranger
  13. I'd trim the cases down to 1.750" and seat the bullets so that the COL is 2.200". At least then you'll be consistent with the Hornady load data as a starting point. Beyond that, any chance your gas system is a little gumpered up or leaky? Maybe you're operating close to the lower limit of the pressure needed to produce a full stroke cycle. Just for reference, how close to the 1.750" case length are you now? -Longranger
  14. Ok. 68gr @ 2900fps is the same energy as 55gr @ 3224fps. So, the question is are you at 3200fps with your loads. Hornady 9th is showing 2.200 COL for the 55gr FMJBT w/c. Is that what yours are measuring? -Longranger
  15. I would be very surprised if tightening the crimp would make a difference. -Longranger
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