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    SK S+ deviation / Rimfire

    The chronograph shows an ES of 93 fps for 65 rounds of SK Standard Plus, with an SD of 25 and a spread of 913 - 1006. The temps were about minus 15 degrees Fahrenheit ("+\- 15 F"). The cold temperature explains the slow MV of the rounds (it doesn't take long for a warm round to cool). The...
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    deviation in cold .....5 degrees

    Comparing small sample sizes often gives unreliable data. When it's colder, all rounds will be slower. When it's warmer all rounds will be faster. With large samples, the standard deviation and extreme spread should be similar in both.
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    Round count to determine the best lot# ?

    A lot of .22LR match ammo usually is about four to six cases in size, sometimes a little less or more. That's 20,000 to 30,000 rounds. In a .22LR match ammo population measured in tens of thousands, how many should be looked at before making an evaluation? What level of confidence is...
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    22 LR weight feedback, does it helps or is a myth?

    All rounds are not always equally good, especially midgrade ammo varieties. As noted by Calfee and others, so long as ignition is good and headspace is safe, headspace itself is not critical to accuracy performance. In other words, headspace doesn't matter enough that sorting ammo for it will...
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    22 LR weight feedback, does it helps or is a myth?

    I erred in saying cull with regard to lousy rounds. The purpose, nevertheless, remains to identify the good rounds from the lousier ones. If sorting by rim thickness is supposed to select rounds with a certain range of rim thicknesses to match a particular headspace, those rounds that don't...
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    22 LR weight feedback, does it helps or is a myth?

    If sorting is intended to cull the lousier rounds from those that might shoot well, is there much to be gained over buying ammo right off that shoots well? It's not as though sorting makes all rounds better. Say some sorting method identifies 50 better rounds out of 100 mid-grade rounds...
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    Why would my groups open up suddenly?

    Regarding the "old timer thing" about not cleaning, it would have been not uncommon to hear that only a few decades ago from older shooters themselves. Those who shot .22LR in the first half of the 20th century would very likely have been aware of the time when cleaning .22LR bores was a...
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    Precision rimfire state of the Union for 2025, help get me up to speed please…

    Chronographs don't measure exit timing. No one can know whether or how much changing from free recoil to shouldered changes the muzzle velocity. The MV of a round is not known before it's fired, no matter how the rifle is held or not held.
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    Precision rimfire state of the Union for 2025, help get me up to speed please…

    Indeed. If a setting is good for any .22LR distance is puts into doubt the PC explanation for how a tuner does what it does, unless PC is valid only up to a certain distance and something else explains how tuners work beyond that. The suggestion that a Garmin (or any chronograph) can record...
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    Precision rimfire state of the Union for 2025, help get me up to speed please…

    This Varmint Al website says that tuners work by launching slower bullets with a higher launch angle than faster ones. The website includes a chart illustrating the trajectories of slower and faster rounds, showing the slower and faster rounds arriving at the same elevation at 50 yards...
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    Precision rimfire state of the Union for 2025, help get me up to speed please…

    For readers in general, when using a rimfire tuner are shooters tuning the ammo or tuning the barrel?
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    Precision rimfire state of the Union for 2025, help get me up to speed please…

    The 1827 Fortner receiver has 11mm dovetails only on the rear part of the receiver. The dovetails are made for the rear aperture sights commonly used on biathlon rifles. Those who want to use a scope with the 1827 can use the same readily available methods used by shooters with pre-1964...
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    Tenex by lot #

    What doesn't change, whatever the stock or chassis, is the barrel. It will do what it can with the ammo it gets. FWIW, the Lapua Rimfire Test Shooting website, as well as Capstone's "Important Notes About Testing" still indicate at this time that, unless requested by a customer, the barreled...
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    Xero® C1 Pro Chronograph

    As beetroot says, the Xero is very convenient and no chore at all to set up. Previously I used an optical chronograph, which I learned to set up very quickly. But the Xero is a simple matter of placing on the bench in an appropriate spot. It's that straightforward. I used it each time and...
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    The whole box at 100 yards

    Anecdotal reports like these are dependable evidence that Center X is not as good as memory serves.
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    The whole box at 100 yards

    Shooters can expect that, conditions aside, different boxes of the same lot may produce different results at 100 yards and even more different results at twice the distance. In other words, some will be worse, perhaps a few a little better.
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    Shortening .22 Rifle Barrel...Any Down Side?

    Familiarize yourself with the problem of transonic turbulence. You'll see that it may become a problem for some bullets as they slow down from supersonic speeds and enter the transonic range of speeds. As has been noted above, the vast majority of .22LR ammo never exceed the transonic range...
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    Shortening .22 Rifle Barrel...Any Down Side?

    A Savage barrel may not be any tighter at the muzzle than elsewhere, in which case cutting it shorter won't interfere with that aspect characteristic of some barrels. Supersonic .22LR velocities aren't the problem many shooters think they are. Transonic turbulence, which puts accuracy at...
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    Are precision .22 rimfires ammo picky or

    The chambering and crowning are only two parts. The round goes into the chamber and exits the muzzle. The part in between -- the bore -- also has a role because not all bores are equal. The bore is at least as, perhaps more, important, as chambering and crowning in ammo performance...
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    Why do you like rimfire?

    When people are too poor to eat except by shooting deer with .22LR, it also explains hunting out of season. :whistle:
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