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  1. P

    a geek’s delight: reverse engineer a distance-velocity table to Cd/Mach curve

    It all runs in your browser, there are no server-side components. This said, the complete archive of the latest release is here: https://bc.geladen.ch/source/getcdmach-latest.zip Enjoy! (and apologies for my loose coding standards, it is really a quick-and-dirty hack, in a language that I am...
  2. P

    a geek’s delight: reverse engineer a distance-velocity table to Cd/Mach curve

    Thanks! Hope it comes useful.
  3. P

    a geek’s delight: reverse engineer a distance-velocity table to Cd/Mach curve

    To start with: for a regular shooter what follows is perfectly useless. You have been warned. Who may be interested then? – People who write their own ballistic calculators, or people who want to have an idea of how a particular bullet, according to manufacturer’s data, behaves in transonic...
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    Sako S20 Optilock 20 MOA mount: review

    Completely agree. As much as I love my S20, today, with after-knowledge, I would have taken the Tikka UPR. A friend recently brought it to the range, we were measuring V0 for range cards, and I had a chance to shoot a couple of dozen high quality cartridges with it. In my eyes, there is no...
  5. P

    Swiss K31: Stunning

    Probably never. The old GP11 was exported because there was a huge surplus in the army stocks (enough to hold a long nuclear winter), and it was approaching the limits of shelf-life. The new production is running much more more tightly -- to satisfy the demand of the army and of militia...
  6. P

    Swiss K31: Stunning

    Coming soon. One of my suppliers has messed up critical dimensions on a part, so the whole batch needs to be redone, and that takes a few weeks. Release to the Swiss market is scheduled for end-March / beg-April, immediately shippable to EU/Schengen countries. Then I'll see about exporting to...
  7. P

    Swiss K31: Stunning

    Tanks a lot for your encouragement! I have really put a lot of thought, time, and effort in this piece, and I really hope it will encouter the success I think it deserves.
  8. P

    Swiss K31: Stunning

    Specs and more photos: K31-XXI 10-shot magasine (Hope I am not going to get banned on SH for unapproved commercial advertisement.)
  9. P

    Swiss K31: Stunning

    Thanks! It's all old-school sheet metal, stainless steel (except the polymer CNC follower). Respecting the memory of Adolf Furrer, I would not settle for less (and the PVD coating is likely to be more abrasion-resistant than the original oxidising). It's true that tooling costs are very...
  10. P

    Swiss K31: Stunning

    Thanks! Indeed, considering the number of K31s in circulation in the US, that might be interesting. First, I'll get the production rolling, then I'll have some material to speak with dealers who export to the US; will keep you posted here.
  11. P

    Swiss K31: Stunning

    The K31 magazine I always wanted (and ended up making, because nobody else would). That's the final prototype; production runs to hit the Swiss market in Q1 2023.
  12. P

    How to adjust zero

    The generic answer is: use a ballistic calculator to check how many clicks you need to make with your rifle zeroed at 100m to be poa=poi at your available range. (And -- yes -- chances are that in your specific case it will be within 0.1 mrad.)
  13. P

    Swiss K31 in a custom Stock with the OBM ascope system

    What about the eye relief? Is it ok? Judging by the photos, the ocular lens looks a bit too close to the eye.
  14. P

    Calculating true distance to target when shooting downhill

    The "equivalent horizontal range" has a rather limited scope of application; it is hardly any better than not taking slope into account at all. The "improved rifleman's rule" is much better. Gory nitpicking: https://geladen.ch/en/inclined-fire/
  15. P

    Follow up on reloading for ELR…

    This is by far not linear. As you can see, with the increasing number of shots (top-down) for a given SD (column), the confidence interval does not decrease linearly; it very quickly gets to "diminishing returns". And -- just to clarify -- the values in the table represent confidence intervals...
  16. P

    Follow up on reloading for ELR…

    I'm not sure: either I did not describe it clearly enough, or you are interpreting it the way I did not expect. What exactly do you mean?
  17. P

    Follow up on reloading for ELR…

    For the geeks out there: http://ballistipedia.com/ (caution: lvl. 80 maniacal nitpicks) And my [rather awkward] practical implementation: https://bc.geladen.ch/taran/taran.html To confirm @Ledzep 's findings, here's what the science says Size of the group, expressed as multiple of Rayleigh's...
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    Follow up on reloading for ELR…

    +1 ES on small samples is an extremely poor measure, as it is too much subject to random noise. SD is way, way better, but then again, in order to have something meaningful, you need a certain number of shots anyway. Here: rows = SD in m/s (to convert to archaic units, multiply by 3.3)...
  19. P

    Follow up on reloading for ELR…

    Google for "argumentum ad verecundiam". Winning competitors? All? Most? Some? A few? One guy with whom my brother in law had a beer once? Claiming that "winning competitors" are evaluating the precision of a load on a basis of a single 5-shot group is… to stay polite… a bold statement. I...
  20. P

    Inexpensive 22lr target scope? Arken or Athlon or other?

    Have a look at the Vector Optics 34mm Continental 4-24x56 FFP. 34 mrad = 117 MOA total elevation, very decent optics and mechanics, tracks flawlessly, zero-stop, 10 mrad per turn, turn indicator, etc. I am running a 3-18x version (44 mrad / 151 MOA total elevation) on a Tikka T1x rimfire...
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