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  1. 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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    Off the shelf Precision Rifle under $2K recommendations

    Don't think it was mentioned in the thread: the Sako S20 is excellent. The same philosophy as Tikka (but maybe a small step up in quality and finishing), shoots straight out of the box, and doesn't weight like a dead donkey. If I read US prices correctly, with 2K you would have plenty of budget...
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    Follow up on reloading for ELR…

    All I am saying is that for most practical purposes, as a measure of load precision, a single 5-shot group size is meaningless, the confidence interval is larger than the actual value. (Caveat: such metrics can make sense to quickly discard totally bad loads, or totally bad barrels (the...
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    Follow up on reloading for ELR…

    To start with, any conclusions based on a 5 shot group size are invalid, as the "data" is largely insignificant from statistical and engineering standpoints.
  5. P

    Wind Rose AT

    Bringing PP's wisdom to the masses, are you? :)
  6. P

    338 Lapua suppressor question

    You may be right, I did not think of it. Usually the "difficult to get" goes the other way around :)
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    338 Lapua suppressor question

    Ase Utra SL7i -- either threaded or QD (over a proprietary brake) -- does the job pretty well. Very reasonable size and weight, and decent recoil reduction.
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    Swiss K31: Stunning

    Shooting a k31 is allright, but reloading GP11 brass is not? Here = where? Hearsay. Ruag and the army have done a very, very serious study based on these claims, and have factually refuted all claims in that sense (which, by the way, perfectly matches the results of my own tests of old vs. new...
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    Swiss K31: Stunning

    Looks good, thank you! This said, judging by the photos, it should be coming with a ~50mm cheek riser in the kit.
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    Sidearms & Scatterguns Thinking about getting a Glock

    Although I still have some gen3 and gen4 lying around somewhere, I ended up "standardising" on gen5. Reasons: * If you have large fingers, the finger grooves (gen3 and gen4) on a G19 can be a pain, literally. The top groove is smaller than others, and a 300 rounds shooting session without...
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    Swiss K31: Stunning

    The original GP11 projectile has a G7 BC of 0.274; that's what one should aim for to reproduce the original external ballistics. If my memory is good, Hornady has something 175grain-ish with a very similar BC. This said, the projectile has evolved over the years (I could never find any...
  12. P

    Multiply a 3-shot group by 1.28 to get your expected 5-shot group?

    We're not getting younger, aren't we? As to FORTRAN... Several lives ago, when I was a kid nerd, I learned FORTRAN to port a Star Trek game from DEC PDP-11 to Sinclair ZX Spectrum BASIC; 35 years down the road, that exercise remains in the top-5 of my personal coding projects hall of fame. I...
  13. P

    Multiply a 3-shot group by 1.28 to get your expected 5-shot group?

    Perl is what God hacked this Universe together with. For weaklings, I can traslate this into LISP, Python, Javascript, C++ or Java, and I think I still remember enough of Go and Haskel syntax to satisfy a perverted cultist. This said, if you have a closed-form expression for the average size of...
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    Multiply a 3-shot group by 1.28 to get your expected 5-shot group?

    The distribution of impacts on the target very closely follows the Rayleigh distribution (2D normal with same sigma vertical and horizontal), rather than a 1D normal distribution; the figures are different from 1D bell curve critical values. The ballistipedia guys --...
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    Multiply a 3-shot group by 1.28 to get your expected 5-shot group?

    Maybe you're right. I certainly don't know enough about the capabilities of modern metalworking machines to have an idea of the cost equation.
  16. P

    Multiply a 3-shot group by 1.28 to get your expected 5-shot group?

    Interesting, thank you! I'd be curious to know their testing protocol. I've read that the Soviets used a 4-shot group extreme spread to QC every military AK at the Izhevsk plant, discarding whatever was above a certain threshold (and double-testing the whole batch if it happened). That was...
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    Multiply a 3-shot group by 1.28 to get your expected 5-shot group?

    It is only the next morning that you really know how good it was.
  18. P

    Name that ballistic program

    https://bc.geladen.ch/plan33/plan33.html -> the "Hit %" button. Caution: not for the metric-impared. Understands moving targets, spotter/second shot and rapid semi-auto scenarios, scoring ISSF targets and Swiss military field targets, etc. Web-based, free and open source.
  19. P

    Multiply a 3-shot group by 1.28 to get your expected 5-shot group?

    The actual number is 1.27 (I believe 1.28 comes from ballistipedia; they have a small bug in their code which skews the results a little, but their conclusions are still largely correct). The ratio of x1.27 between extreme spreads of 3-shot groups and 5-shot groups is, strictly speaking...
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    Swiss K31: Stunning

    Indeed, the standard deviation of muzzle velocity of 1990s production GP11 is typically between 4 and 4.5 m/s (13-15 fps), depending on the batch, and with a match barrel it typically stays within the 10 ring of ISSF target at 300 m (10 cm); in Switzerland the ammo is routinely used for 300 m...
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