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315y today

TheGerman

Oberleutnant
Full Member
Minuteman
  • Jan 25, 2010
    10,608
    30,196
    the Westside
    A bit of a continuation of my 'had a lot of drift' thread, I think I got the problem solved. Seems it was a mix of slight cant (which the 22LR basically exponentially made worse) and a checkbox error I made on JBM when I first made my basic range card to work off of.

    Put Badger rings on it instead of the older Vortex rings that came with the scope and replumbed the reticle against a 10lb weight being held by 550 cord at 100 yards. Zero'd at 100 and shot a few 5 shot groups that were very nice and started putting little gongs out at random distances.

    I know there are a lot of people who believe that 50/100y is what the 22LR is for, and most 22 competitions rarely if ever (not saying they dont) really go past 150 yards. Since I really wanted to start being able to split hairs with wind calls as well as weird wind calls (wind different at target, shooting past canyon walls for 50% of the distance, etc) I have really been going at it with the 22 this year.

    Target is usually a 3 gong steel swinger (pics attached) where the middle gong is a hair over 2 inches, and the larger gong is 3.2 inches. With a good mirage, I can't even see the 2 inch gong half the time; however today, there was next to no mirage which presents its own set of problems when trying to determine what the wind is doing downrange especially since the first 75ish yards are blocked from my 3 o clock to basically have no wind due to a canyon wall and as soon as the bullet passes the wall, there's wind.

    243 yards made 5/5 and 3/5 hits (target with my finger pointing at it after the first 5/5) for reference and then put a clay pigeon holder with a standard clay in it at 315 to see if I could get a hit as I wasn't sure I'd move the gong much and after 13.4MILS, managed to on the 2nd round.

    At 315, the round is basically coming down like artillery with 155 inches (13 feet!) of drop and with a 5mph it needs 2MILS of hold. I used both the steel spinner gong and a 4.5 inch self repairing polymer gong. When hitting the gong at that distance, they just barely hit it and fell off right in front of it making a neat little pile of flat bullets; at 243 they still ricocheted off.

    You have to have the shot set up, trigger pull perfect as well as follow through down or it'll miss by just THAT much. I was getting to the point of knowing if I was getting a hit while it was still flying through the air by where the reticle stayed during/after the trigger pull. The slightest movement of it, even while keeping it on the target but not perfectly still, would give you an annoying miss by just a little bit. There were a few that were either part me and part semi flyer round that had REALLY opened up by the time it got there but making a hit was not as consistent as at 243 where I felt I could do it almost every time, yet it was doable far more than I thought it would be.

    CZ455 in Manners stock
    Vortex Viper 4-16 FFP
    Lilja barrel
    Timney trigger
    Lapua Center X
     

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    Good shit. Have an moa 4-16 PST on my VPT and it seems to be a good match for the rifle.

    Don't read much about guys using mirage around here, but it's one of the main things I'm watching when I shoot.. I have a fuck of a time shooting a 22lr well without it.
     
    Good shit. Have an moa 4-16 PST on my VPT and it seems to be a good match for the rifle.

    Don't read much about guys using mirage around here, but it's one of the main things I'm watching when I shoot.. I have a fuck of a time shooting a 22lr well without it.

    4-16 is perfect for the 22.

    As for mirage, you know it becomes important the further away your target is and with a 22 that happens exponentially faster. The 16x top end lets me see the mirage yet doesn't make it basically make the sight picture look like I'm inside a washing machine either.

    With the 22 at 200+, watching for the slightest shift makes the biggest difference. Have already saved myself from going to the wrong side with an adjustment because the conditions at 250 were different. Whereas that wouldn't matter THAT much with a centerfire, it would easily be a miss with the 22.

    This is my entire point to longer ranges with it; to make me notice the smaller changes and account for them when I'm shooting a magnum.
     
    What kind of groups does your rifle hold at 100? I ask because I just started stretching my MkII .22 (Boyd's stock and Talos BTR 4-14) out to 300 yards the other day. I only feed mine cheap stuff and it likes minimags the best but only really keeps 5 round inside 1.25-1.5" @ 100 yards. I have a 3"x4" diamond I use for positional/barricade practice with it at 100 and 10" circles @200 & 300. I'll have to hang some paper and get proper dope so I can hang some smaller targets but my impacts were pretty centered up with 5.2 mil @ 200 and 11.0 mil @ 300. The hang time @ 300 seems about the same as shooting my .308 at 800+ yards, haha.

    Is there a good resource for getting BCs for rimfire projectiles to make a range card or just get your dope and MV and tweak the BC in JBM till it lines up with your dope?
     
    Is there a good resource for getting BCs for rimfire projectiles to make a range card or just get your dope and MV and tweak the BC in JBM till it lines up with your dope?
    There's plenty of rimfire factory loads in JBM's bullet database. Is this the one you use: CCI, .223 cal, 36 gr , Long Rifle Mini-Mag HP? If so, just select it and enter your atmospherics and range info.
     
    There's plenty of rimfire factory loads in JBM's bullet database. Is this the one you use: CCI, .223 cal, 36 gr , Long Rifle Mini-Mag HP? If so, just select it and enter your atmospherics and range info.

    It seems kind of ridiculous now but I never even thought to look, thanks!
     
    What kind of groups does your rifle hold at 100? I ask because I just started stretching my MkII .22 (Boyd's stock and Talos BTR 4-14) out to 300 yards the other day. I only feed mine cheap stuff and it likes minimags the best but only really keeps 5 round inside 1.25-1.5" @ 100 yards. I have a 3"x4" diamond I use for positional/barricade practice with it at 100 and 10" circles @200 & 300. I'll have to hang some paper and get proper dope so I can hang some smaller targets but my impacts were pretty centered up with 5.2 mil @ 200 and 11.0 mil @ 300. The hang time @ 300 seems about the same as shooting my .308 at 800+ yards, haha.

    Is there a good resource for getting BCs for rimfire projectiles to make a range card or just get your dope and MV and tweak the BC in JBM till it lines up with your dope?

    Less than an inch with 5 shots. For rimfire, my warmup is putting a target out at 100 with 4 orange 2 inch stickers on it. 3 are for groups, one is the cold bore. 1 shot at cold bore, the remaining 4 at target 2, and then 5 on the other 2 targets. The only difference is sometimes I will check my cold bore to see if the offset is what I think it is/has been in the past (.2mil left, .2mil down) to verify it and sometimes I will adjust to make a center hit. Either way I am confirming it, and I keep the coldbore target as well as the target with 4 shots on it, stick them together and take them home for my notes.

    As mentioned, JBM has 22LR loads. A good starting point for match grade Wolf/Lapua (which I think you'll see better accuracy with) is:

    Lapua 40g, 1066fps, .132BC, .482 projectile length
    Wolf 40g, 1050fps, .130BC, .482 projectile length

    This will get you close, but I've found that they are not 100% in my gun. The barrel length and a bunch of other variables can throw this off, but these will get you close if you do a range card in JBM or on your ballistics calculator. Then simply put targets out at known distance and see where you end up as far as the variance between the data and what you actually needed and reverse engineer the BC/velocity to true your trajectory now that you have multiple known intersects.

    ETA - Looks like you found the JBM data for your bullets above; same principle, just different data. You're also going to want to get your ZERO atmospherics, keep that noted and then make data cards for DA in 2k or so steps as well as temperature ranges for each. With the small variances in 22LR adding up to a lot especially when you go 200+ yards, every little .1mil matters. I make them for 2k DA steps, and each step has 4 temperature steps.
    22LR – 40g Lapua Center X
    Density Altitude 2000
    Temp 60F / 1066fpsTemp 80F / 1066fps
    ZERO – 70*, 4000DAWind @ 5 mphZERO – 70*, 4000DAWind @ 5 mph
    DistanceMILSSpin – RFullHalfDistanceMILSSpin – RFullHalf
    502.00.00.30.2502.00.00.30.2
    751.10.10.40.3751.10.10.40.3
    1000.00.10.60.41000.00.10.50.4
    110-0.50.10.60.4110-0.50.10.60.4
    120-1.00.10.70.5120-1.00.10.60.4
    130-1.50.10.70.5130-1.50.10.70.5
    140-2.00.10.80.6140-2.00.10.70.5
    150-2.60.10.80.6150-2.50.10.80.6
    160-3.10.10.90.6160-3.10.10.80.6
    170-3.70.20.90.6170-3.60.20.90.6
    180-4.30.21.00.7180-4.20.20.90.6
    190-4.90.21.00.7190-4.80.21.00.7
    200-5.50.21.10.8200-5.40.21.00.7
    210-6.10.21.10.8210-6.00.21.10.8
    220-6.70.21.20.9220-6.60.21.10.8
    230-7.30.21.20.9230-7.20.21.10.8
    240-7.90.21.20.9240-7.80.21.20.9
    250-8.60.21.30.9250-8.50.21.20.9
    260-9.30.21.30.9260-9.10.21.30.9
    270-9.90.31.41.0270-9.80.21.30.9
    280-10.60.31.41.0280-10.40.31.41.0
    290-11.30.31.51.1290-11.10.31.41.0
    300-12.00.31.51.1300-11.80.31.51.1

    22LR – 40g Lapua Center X
    Density Altitude 2000
    Temp 100F / 1066fpsTemp 120F / 1066fps
    ZERO – 70*, 4000DAWind @ 5 mphZERO – 70*, 4000DAWind @ 5 mph
    DistanceMILSSpin – RFullHalfDistanceMILSSpin – RFullHalf
    502.00.00.30.2502.00.00.30.2
    751.10.10.40.3751.10.10.40.3
    1000.00.10.50.41000.00.10.50.4
    110-0.40.10.60.4110-0.40.10.50.4
    120-0.90.10.60.4120-0.90.10.60.4
    130-1.40.10.70.5130-1.40.10.60.4
    140-1.90.10.70.5140-1.90.10.70.5
    150-2.50.10.70.5150-2.40.10.70.5
    160-3.00.10.80.6160-3.00.10.80.6
    170-3.60.20.80.6170-3.50.20.80.6
    180-4.10.20.90.6180-4.10.20.80.6
    190-4.70.20.90.6190-4.60.20.90.6
    200-5.30.21.00.7200-5.20.20.90.6
    210-5.90.21.00.7210-5.80.21.00.7
    220-6.50.21.10.8220-6.40.21.00.7
    230-7.10.21.10.8230-7.00.21.10.8
    240-7.70.21.10.8240-7.60.21.10.8
    250-8.30.21.20.9250-8.20.21.20.9
    260-9.00.21.20.9260-8.80.21.20.9
    270-9.60.21.30.9270-9.50.21.20.9
    280-10.30.31.30.9280-10.10.31.30.9
    290-10.90.31.41.0290-10.80.31.30.9
    300-11.60.31.41.0300-11.50.31.41.0
     
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    The furthest I've pushed out the ole 452 was 400. My hs-t maxes out at 16 mils so at that point I had to half my magnification so I could keep the target in my fov as I held for the extra 5mils. At that distance a hit is a hit and its kind of a crap shoot with the wind. Luckily on that particular day back in spring the wind was very calm and at my head.

    13Xsq06.jpg


    The results for the day
    7IXqYOU.jpg


    Really fun stuff