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  1. __JR__

    Gunsmithing Help deciphering bore scope pics

    So with all that pomp and circumstance, this is what I see. Which has nothing to do with performance, but what are you looking at and why does it look like that. You are looking at the result of the condition of a pre button rifled bore. If it was bore reamed after gundrill, then they are...
  2. __JR__

    Gunsmithing Help deciphering bore scope pics

    Borescope images may not be complex for some but at the same time often are not simple to understand cause or effect. Think about it like a 10 second iPhone clip from the Blake video vs the Kenosha police report. Then throwing it on social media and there's riots in the streets. Images on a...
  3. __JR__

    Gunsmithing 5R or 6 groove barrel

    10 might get you there, but knowing what is coming personally I would be leaning towards 8-9T on that MV. If you're shooting these you're probably going to try longer projectiles once they start hitting the market. Later
  4. __JR__

    Suppressors Dielectric Grease ... (Best Advice EVER)

    especially with the tag line
  5. __JR__

    Gunsmithing 5R or 6 groove barrel

    well the truth often is. I'm just so glad there are reputable apps or websites that can tell you what twist rate you need to stabilize any particular bullet now. Later
  6. __JR__

    Suppressors Dielectric Grease ... (Best Advice EVER)

    Must be a good friend
  7. __JR__

    Gunsmithing Brass sticking in chamber

    Don't worry, it wont have a mirror like finish. we polish chambers to optical finish for chrome line to get the lay as flat as possible before crudding with chrome, but the standard unchromed is not approached like that in general. If you said you have longitudinal lines on your brass, give...
  8. __JR__

    Gunsmithing 5R or 6 groove barrel

    What velocity?
  9. __JR__

    Gunsmithing HS Precision Barrels

    Top tier. Doug Hardesty is a craftsman.
  10. __JR__

    Don't blame the rifle...

    11 out of 10 barrelmakers agree, that it's not just the barrel that maketh the accuracy.
  11. __JR__

    How were '03 and Garand barrels rifled?

    Chrome existed then. The high quality steels didn't necessarily mean they were harder btw. Might have meant cleaner, less porous.
  12. __JR__

    Gunsmithing 5R or 6 groove barrel

    Frank, the answer is yes. Haha, guys Frank and I could do a podcast on this stuff, but we'd probably lose audience quick as we can get in the weeds quick. Land/groove width ratio, cross section, jacket thickness, jacket hardness, etc... That and his Cheddar accent mixed with my sudden...
  13. __JR__

    How were '03 and Garand barrels rifled?

    Material based, it's metallurgy dude. Can't heat treat traditional barrel materials in traditional contours or OD's to meet a 48Rc without it going kaboom on both ends. So if you get too hard, depending on impact strength your barrel life could be 1 or less than 1. There are other alloys in...
  14. __JR__

    How were '03 and Garand barrels rifled?

    You wouldn't be cold hammer forging to achieve Rc48. Probably checked barrel hardness on outside, and probably not accurate measurement. Only way to hit 48 would be a heat treatment after or a coating, and no one would want a 48Rc steel substrate to kaboom anyway. No longer tough. Now brittle.
  15. __JR__

    SR30 v SR15

    Just for curiosity sake, what enhancement from the SR15 extractor could we extrapolate to the SR25? and why?
  16. __JR__

    Anyone here had Covid?

    Aint got time to get the rona. Work is too busy, and the kids are too busy. What I am getting is less sleep and more confused where this country's heart is. Later
  17. __JR__

    M118LR and primer flow

    10-4. In that case, rather than tinternet roulette you should call Steve Dahlke up in Cheddarland. If this is showing signs from get go or after 'x' amount of rounds he may recommend a carbon clean. Later
  18. __JR__

    M118LR and primer flow

    'Touch point' on 308 win chamber a lot closer to m118lr bullet than NATO spec, that with the smaller diameter throat drives pressures up. TP is basically the jump. So yeah, my advice in a gasser is to shoot M118LR in Nato or chamber designed for the round. Later
  19. __JR__

    Gunsmithing Setting Head Space with an Empty case?

    Alan would probably know the terminology, ball check. One, two..three? well sometimes even 4 and 5. There's many military chambers that are specced out with basically ball bearings of different sizes and it makes absolute sense for true precision really. That old school stuff never lets you...
  20. __JR__

    Gunsmithing Left hand gain twist in a gas gun?

    I reckon I know why Frank prefers LH in a gas gun. Later
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