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  1. OK If sorting doesn’t

    TKH, Thanks for that informative link. The gravel road you mention used to climb up to 3 and 9 o'clock at the 50 to 55 thousand rounds levels before accuracy degraded too much. After the primer got more abrasive glass frit in it, around 30 thousand rounds was the limit. So claims Neal Johnson...

  2. OK If sorting doesn’t

    The website I referenced lists records up to date. Scroll down and you'll see one dated 2011 for seniors. Change the search criteria and see others. Group sizes for a few shots is one example for other disciplines. All the other groups are bigger. What best defines accuracy; largest...

  3. OK If sorting doesn’t

    All rimfire ammo companies changed their primer mix. Eley Tenex and RWS R50/100 was more accurate than others back then. Accuracy doubling means groups are twice as big. Largest groups best define accuracy because all the variables are at maximum amounts.

  4. OK If sorting doesn’t

    Click on: https://competitions.nra.org/results-and-records/national-records/ Then select.... Rifle ... smallbore ... outdoor prone ... 100 yards ... 40 shots ... any sight 100 yard X ring is 1.000 inch. .391 inch at 50 yards: see targets below. Lones Wigger told me about the primer issues...

  5. OK If sorting doesn’t

    All of the 100 yard prone w/scope records for 40 shot matches set before 1980 still stand. As does most of the 50 yard ones. An explosion back then at a factory case priming station ended up being fixed by adding more glass frit to the primer mix. The formula was also changed. All factorys...

  6. Correct placement of wind flags?

    Winds closest to the firing line have the most effect on bullet drift at target range. If flags can be 100 yards behind the firing line on both sides, shooters can see what's coming when the wind is from 4 to 8 o'clock.

  7. Concentricity gauges and neck tension

    My point is the case shoulder centers in the chamber shoulder before the round fires from ejector or firing pin force. There's typically a little clearance around the case body to the chamber except at the case pressure ring where it's usually pressed against the chamber by the extractor. A...

  8. Concentricity gauges and neck tension

    I'm not impressed by your blatant ignorance. It's typical of unqualified forum moderator wannabes who, in reality, are ignoratiolinguists.

  9. Concentricity gauges and neck tension

    Because I don't think I'm the only person who knows what cartridge-chamber issues actually position the bullet relative to the bore before and when the round fires. I'm encouraging others to figure it out themselves. Your snide remarks don't contribute anything worthwhile.

  10. Concentricity gauges and neck tension

    Even with a strong in line ejector spring pushing the case shoulder into the chamber shoulder before firing? What about a 2.5 ounce firing pin moving 20 fps pushed by a 25 pound spring force?

  11. Concentricity gauges and neck tension

    Does the case body at the dial indicator touch point ever touch the chamber wall on a chambered round when the firing pin hits the cartridge before it fires?

  12. BC Variation bullet to bullet is real, and its a problem.

    Wind speeds above the LOS are faster than in it. Varies with terrain. With a 308 Win zeroed at 1000 yards in open flat land has 50% faster winds at about 11 feet above the LOS where it's at the maximum ordnate (high point) about 570 yards down range. .

  13. BC Variation bullet to bullet is real, and its a problem.

    Back in 1971, Mid Tompkins spun a few boxes of Lapua D46 185gr FMJRB match bullets in a collet held by a Dremel MotoTool spinning over 30,000 rpm. An amp meter was in the power cord. Bullets requiring the least current to spin them were considered best balanced. More current, more unbalanced...

  14. What twist rate and length for 300WM barrel

    How much do bullet's spin rate in rpm decay across 1000 yards?

  15. .30-06 F-Class Rifle

    Ensure the reamer has a 1.5 degree throat angle and it may shoot as accurate as the 308 Win. A 1:12 twist 26 to 28 inch barrel is best for 190 to 200 grain match bullets in warm weather with max loads.

  16. load to the node?

    Yes indeed. Grade school reasoning. Not complicated.

  17. load to the node?

    Yes. If the load causes the bullet's trajectories cross at about 200 yards. If you use ballistic software plotting 2 trajectories to zero at 200 yards with a 25 fps muzzle velocity spread, note the trajectory height above LOS at 100 yards for each velocity. Some people put tuning weights on...

  18. load to the node?

    Remember that all free floating barrels for a given cartridge with the same steel, weight, length and profile will have the same resonant vibration low frequency and several harmonic vibrations higher frequencies. The amount and vertical direction the barrel bore axis vibration at the muzzle...

  19. Optimum Barrel Length for .22LR

    I don't think a longer rifle sight radius helps. A master class smallbore prone shooter can hold the LOS inside a half MOA area on 100 yard targets. With a 24" sight radius pivoting on the rear sight, the front sight moves about inside a .0033" diameter circle. LOS on target moves about...

  20. velocity question?

    Shoot 25 shots then check the velocity spread.

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