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Recent content by jgraves

  1. J

    Winter gloves for shooting

    I wear either Under Armour glove liners or North Face soft shell gloves while shooting. The glove liners are a barrier between my hands and the aluminum chassis but are not very warm and offer no water resistance. I can reload Vudoo 22LR mags wearing the glove liners with some difficulty. The...
  2. J

    Does Anyone Use An Electrically Heated Vest

    I wear heated base layers from https://www.warmnsafe.com/ for winter PRS events (and shoulder season motorcycling, snowblowing, etc). It appears to be good quality and provides noticeable heat even when running from their batteries. I consumed almost 3 full batteries wearing only the shirt (on...
  3. J

    Calculating MOA from 9 targets, one shot on each?

    OnTarget TDS. You can download a 15 day demo and it will build composite groups. I built 120 shot composite groups a couple weeks ago. And you can export to excel to geek out even further.
  4. J

    1/2 MOA at 100 yards, all day, every day!

    I haven't looked at any of the data too closely yet, and I fully expected the data to be poor quality due to the short distance. My priority was to collect and compile sample data while I had an opportunity and my OnTarget TDS trial was still active. The chronograph errors should be a relatively...
  5. J

    1/2 MOA at 100 yards, all day, every day!

    Data from targets 1 and 2, including chrono at muzzle (chassis mounted Magnetospeed) and ~18.2 yards (CED M2). Shot Distance Center X Center Y Point X Point Y Muzzle Velocity DownRange Velocity Difference 1 19.1 0.001 -0.032 0.005 -0.098 1033 1013 20 2 19.1 0.001 -0.032 0.027 -0.093 1017...
  6. J

    1/2 MOA at 100 yards, all day, every day!

    Although certainly tangential to the original post, I've been exploring OnTarget TDS and statistics beyond group size based on maximum center to center measurements. I'm not sure what I've learn applicable to comparing my groups to others on-line and I'm not sure what I'll settle on as...
  7. J

    1/2 MOA at 100 yards, all day, every day!

    The concept has huge potential, particularly the automatic detection of shot location relative to aim point with the predefined targets. I'm hopeful the auto shot detection works well. I've played with a target image from my lot testing with manually identified shot locations and exporting to...
  8. J

    1/2 MOA at 100 yards, all day, every day!

    From this latest exploration of 22lr accuracy, my conclusion is the exceptional rifles with the best matched lots of top quality ammo are consistently around 1/2 MOA at 100 yards for 10 shots in ideal conditions. Even within very high quality rifles and ammo, in fixtures and tunnels, these are...
  9. J

    The effects of the transition from super to sub sonic on the 22lr

    Assuming 1080fps and 1:16” twist, the bullet is spinning at 48,600rpm at the muzzle. A good test of supersonic vs subsonic accuracy potential might be to shoot both at distances before and after the transition, and look at relative precision. Ideally you would capture velocity at both muzzle...
  10. J

    1/2 MOA at 100 yards, all day, every day!

    These are shot off a 6' stepladder, mostly 2 shot per rung and arrow indicates if I was going up or down the ladder. Top of the 1.5 MOA target was starting 1 yard behind ladder, get into position and fire 1 shot within a 10 or 15s par time. Support side means entirely left handed. This really...
  11. J

    1/2 MOA at 100 yards, all day, every day!

    I worked my way through the remainder of How do bullets fly? and http://www.varmintal.com/a22lr.htm, as well as a couple links from those sites. I had read Varmint Al's page years ago. I also found the Hornady Ballistics Playlist quite interesting. BowChamp, thanks for the photos and...
  12. J

    1/2 MOA at 100 yards, all day, every day!

    I'm working my way through this tonight (and probably for the next couple evenings).
  13. J

    1/2 MOA at 100 yards, all day, every day!

    No, he's Canadian but competes internationally, primarily in the US. He occasionally shoots rimfire PRS events with us during the off season.
  14. J

    1/2 MOA at 100 yards, all day, every day!

    I'll have to review the links some other time, I can't afford to get sucked down the rabbit hole this late when I have to be at the office tomorrow morning. ToddM, BowChamp, wind is certainly one of my weaknesses. Running a flag (surveyors tape hanging from my CF tripod at mid-range:eek:) was...
  15. J

    1/2 MOA at 100 yards, all day, every day!

    If I look at JBell's threads and use a 0.75MOA average for 10 shots and an approximately equivalent 0.60 MOA for 5 shots as a criteria, I get these results: 5x10 Average: 1: 0.770” / 0.735 MOA (jbell- Anschutz Benchmark 10/29/19) 2: 0.770” / 0.735 MOA (Reubenski- Vudoo V-22 4/30/20) v1 6x5...
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