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    Tenex by lot #

    As noted, the number of cases produced for any lot is found only on the case label that gets put on each case (the box that holds the ten bricks that are in each case). By looking at a brick there's no way to know how many cases of the lot were produced. Below is another example of a case...
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    Tenex by lot #

    For general information the Lapua rimfire lot number information in www.ocabj.net above has room for more accuracy. The information suggests that what's claimed to be the "actual lot number" increases incrementally, which is to say it goes up with each lot produced. (See the top image below.)...
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    A few nice 100 yard ten-shot groups

    Thanks again. For readers in general, the most important environmental is always wind, especially as distance to target lengthens. As noted earlier, along with ammo all depends on when to shoot. If wind isn't accounted for at 100 yards, shooting well is not possible. I find reading wind...
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    Tenex by lot #

    Like an old wives tale, it's an oft-repeated notion that's incorrect. Regardless of "speed," ammo shoots well or doesn't.
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    Tenex by lot #

    Is this the "speed" of the lot? If it is, why look for a particular "speed" ?
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    Weirdness with Lot-Tested Center-X

    This is an explanation the match ammo makers would endorse. There's no way to know, however, if the ammo makers have revealed the full explanation of how testing is done, when it's done, how often it's done -- or much of anything else. It's all proprietary -- secrets that are never publicly...
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    Valmet smallbore handstop

    The Valmet M55 was produced from 1955 - 1959. The "accessory rail" of many smallbore rifles of that period are not usually like the accessory rail -- sometimes called the Anschutz rail -- seen on more modern position rifles. The older style accessory rail often doesn't accommodate contemporary...
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    A few nice 100 yard ten-shot groups

    Thanks. The Sept. 29 result was shot with an Anschutz 1907. The ones from yesterday were with a 1913. All depends on the ammo and when to shoot.
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    A few nice 100 yard ten-shot groups

    On Sunday this week, Sept. 29, I shot fifteen ten-shot groups at 100 yards with a good lot of Center X. One of them was the best I've had the pleasure of seeing first hand. The caliper shows the outside-to-outside measurement. Of course not all groups were like this one. The fifteen group...
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    Norma XTREME LR-22 Ammo

    justin's observations are what can be expected. It's not unusual for any .22LR match ammo from the same lot to have box-to-box variation in ES and SD, sometimes quite considerable. In other words, match ammo from the same may not be consistent from one box to the next.
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    Lot Testing - What is statistically significant

    Perhaps it's worth considering that the factory doesn't test all of the ammo it produces. After all, no variety of match ammo comes with a performance guarantee of any kind. Some lots are not very good and shoot rather poorly. Why test at all? It's worth noting that after many complaints...
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    When you're testing ammo/lots...

    Too often shooters don't test and accumulate enough data before making a decision. Not all lots of match ammo are consistent from box-to-box. One box may produce results that are quite good, the next may have a few or more outliers or rounds that are inconsistent. Never make the mistake of...
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    Spin drift or other issue?

    One mil at 100 yards is about 3.6". A tenth of a mil at 100 is about 0.36". One MOA is close to one inch at 100. Wind isn't always even between shooter and target. There can be more wind closer to the target than the shooter, or vise versa, or a mix of things in between. This means there...
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    Spin drift or other issue?

    Cant in either or both the rifle and the scope can easily explain a change in POI between 50 and 100. At the same time, if it doesn't happen repeatedly on all range trips, it could be caused by wind. In any case, a .1 mil POI difference is not great.
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    22 LR Long Range Dispersion, What is the Culprit

    With .22LR dispersion increases with distance in a non-linear way, meaning groups get worse and worse with distance until they are little more than patterns, not recognizable groups. A ballistics calculator shows that at 100 yards each 10 fps difference between two rounds results in .25" of...
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    22 LR Long Range Dispersion, What is the Culprit

    There is a non-linear increase in dispersion as distance increases, and this is very obvious in .22LR performance. In other words, rather than a linear increase in group size where group size doubles with distance, especially with .22 rimfire group sizes grow more and more as distance increases...
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    Rusting in Rimfire bores

    The "precision rifleman" who authored that article also claims that his cleaning regimen itself will improve chronograph results. Of course that's nonsense because the ammo itself is responsible for chronograph results, not how the bore is cleaned. _______________________ While chrome moly can...
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    Embarking on a new chapter.

    You should have a positive experience with your ammo. There's something to be said for comparing match ammos and selecting the lot that gave better results, whether it's done at a testing facility or the old fashioned way on the local range. Buying ammo randomly can be hit or miss.
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    EC TUNER TEST B14R

    With group size variation a regular thing, especially at 100, how can you know when the results are because of the tuner or because of the ammo?
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    13 Twist Results

    In the last results target shown, it has the words "clear winner for this gun" printed beside two images of 100 meter results. The size of the ten shot group on the left is 0.79 (inches) and the size of the group on the right is 0.78. On the other targets the average of the two similar groups...
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