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  1. fletcher

    Any love for the 9x18 ?

    I’m a fan of both the round and the Makarov (a work of art in its simplicity). With just a hair more oomph than .380, I agree with RevolvingGarbage that it’s a good minimum defense round. My Makarov stays loaded with +P hard cast flat nose for that purpose.
  2. fletcher

    Can you 3D print Damascus steel?

    Interesting article. Seems like it's essentially an in-situ heat treatment of the alloy - the last layer before a pause is essentially allowed to "quench", and the heat applied by subsequent layers allows precipitation of Ni3Ti, whereas the first layers may be homogenizing . This seems like...
  3. fletcher

    Will Aluminum Frames Last?

    Aluminum has limitations in certain areas, just like steel, and can by no means be stated as completely inferior to steel. If properly designed, an aluminum frame is a perfectly suitable design choice because of the corrosion resistance and weight advantages noted by many others. I am a...
  4. fletcher

    Knife steel vs heat treatment

    The microstructure is predominantly ferrite with small amounts of pearlite - pretty much pockets of it scattered about. As the carbon fraction goes down, the amount of pearlite diminishes (or in some cases is just cementite) until carbon is about 0.008% by weight. Below this, the structure is...
  5. fletcher

    FMJ for defense in small calibers?

    FMJ (or equivalent) for me. Hardcast 9x18 in my Makarov, FMJ in my P32.
  6. fletcher

    How long can you keep magazine springs under tension?

    Time for me to jump back in. Permanent deformation at room temperature by stress relaxation in springs has been addressed in academic literature since at least the 1970's. This mechanism is completely different from both fatigue and creep. You are correct that creep is not operatimg in any...
  7. fletcher

    Accidental tempering with hair dryer?

    It depends on the tempering temperature used for the steel part as to whether it will be affected. Short duration exposures up to the tempering temperature will have no substantial effect. As an example, if the part was tempered at 600F, the temperature would have to be higher before there's a...
  8. fletcher

    Refinishing aluminium receiver

    What rcmodel said. Plain clear anodize helps with paint adhesion as well.
  9. fletcher

    Is keeping a large capasity mag full result in failure to feed?

    Part of the problem with using sag as an example is that it describes a symptom. The symptom could have multiple causes - stress relaxation, wear (e.g. fatigue), overload, etc. There are research papers which document stress relaxation testing methods with reference to sag resistance, so it is...
  10. fletcher

    Is keeping a large capasity mag full result in failure to feed?

    Automotive suspension springs also take some sort of set and can relax to some extent over time. "Spring sag" is a catch-all term describing the symptom in that industry - mechanisms causing sag include stress relaxation. There are numerous papers on the subject (handful cited below), and plenty...
  11. fletcher

    Just FYI: actual weights of some carry guns.

    All of mine were loaded to capacity. Makarov - 8+1 115gr Silver Bear JHP. GP-100 - 6 .357 magnum rounds of unknown make. 1911 (9mm) - 9+1 Winchester Ranger 115gr +P Glock 20 - 15+1 Hornady XTP 180gr
  12. fletcher

    Is keeping a large capasity mag full result in failure to feed?

    I'll tentatively plan on doing this experiment. I have no experience using load cells, but this will be added to the list. Seems like it would be well worth the relatively small investment to put some real data into this debate.
  13. fletcher

    Steel guide rods, good or just a feel good.

    Bean counters will not make those decisions, but they will set cost targets that force engineering to get creative and/or make compromises. Pretty standard occurrence from my experience. Something like that could have prompted a design review, and determined that polymer was OK for a guide rod.
  14. fletcher

    10mm vs. .357 mag ballistic gelatin test

    Thanks for doing the test. That 180gr XTP seemed to do alright in 10mm. Makes me feel better about the two types of ammunition I currently have that use it. It certainly seems to be the hollow point of choice for a number of 10mm loadings.
  15. fletcher

    Steel guide rods, good or just a feel good.

    I agree with the above. Unless there's a history of failure (e.g. bad design) for the polymer guide rod, I see no reason to replace it with a metal one.
  16. fletcher

    Is keeping a large capasity mag full result in failure to feed?

    This discussion happens frequently enough that I'm considering running a quantitative test to evaluate different springs. It's in the brainstorm stage, but I'm thinking of setting up an inexpensive load cell with data acquisition to generate a relaxation curve for a sampling of springs over...
  17. fletcher

    Russian military Makarov -- not import marked

    Avoiding the import marking alone is great cosmetically - good score.
  18. fletcher

    10mm club

    Guess I can join the club now with my new Glock 20. Took it to the range Friday, which was my first time shooting a Glock and first time shooting 10mm. That trigger takes a bit of getting used to, and I started out terribly at 7 yards. After 160 rounds I was doing OK, though. Need a lot more...
  19. fletcher

    Gun Belts

    Also use a Beltman belt for carry. Been wearing it as my daily belt for ~5 years and it has been great.
  20. fletcher

    Is keeping a large capasity mag full result in failure to feed?

    Yes, the springs certainly can weaken over time (causing failures to feed), and there are several threads containing explanations of how and why this happens. However, a quality spring will have been designed to account for long term compression and won't have any issues. Note that even good...
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