Trouble with 22lr dope

74gtf100

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I have a kestrel 5700 sportsman with AB, Applied ballistics mobile and strelokpro mobile and i cant get any of them to line up anywhere close out to 450-500. I know my confirmed dope with my vudoo is as follows:
50y - 0mil
75y - .6mil
100y - 1.7
200y - 9.6

The problem is most of calculators say I should be around 7.2-7.5 for 200y but ive shot 3 different times and everytime 9.6 was dead on a waterline mark on the plate. Ive tried pulling BC and the typical truing methods with no luck. Any helps would be awesome.
 

Dthomas3523

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    BC will change very little with a .22

    Muzzle velocity has a much larger impact. Try that if you haven’t already. Also sight height will change things quite a bit. You can mess with sight height and see what happens.

    Last resort would be to upgrade to the elite software and use the DSF function. With a .22, DSF is the absolute best way to make a curve.
     

    myers129

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    What is your mv? 9.6 is more drop than I have on any of my 22lr at 200. Have you done a tall target test with your optic? Have you confirmed the distance on your 200yd range?
     

    squishee

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    My 5700 sportsman is spot on with my vudoo and ACTUAL velocity.(sk.cci.lapua)
    Bc wont help much as pointed out earlier with 22 rf. Mv is what needs to be tuned.
    Change the Mv on the kestrel till it matches you dope and you will get hits at all ranges. Well for that box of ammo anyway.
    What ammo shoots this low in you vudoo? I shoot suppressed over a cheap chrono and my mv matches data on my kestrel perfect.
    I have dopes for all the ammo i mentioned earlier and though they are different from each other none are as far off as your data.
    Edit If you need 9.6 at 200 you have some slow ammo or a huge headwind
     

    45cal4life

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    Agreed with the target test. Just because you're dialing 9.6 doesn't actually mean 9.6. Verify everything is correct in the calculators, try to be as precise as possible, input the offset (from the target test) then double check everything again with the calculators. Garage in = garbage out
     

    ScottDWallace

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    Buying the custom curve got me a lot closer than using the box BC of .172. Most of us are closer to .131-.135 for BC and tweak MV from there. It is real close at 200, but falls apart at 400. DSF is critical for anything past 200 IMO. Good luck!
     

    Culpeper

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    With your little calculator change your zero until you reconcile your calculated dope with actual dope. Also, inputting MV off the box may not be correct even with subsequent truing attempts. Or you can just write down your actual dope and not worry about it.
     

    74gtf100

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    I went out today and granted its 35 degrees warmer than it was the last time I shot past 100y but my dope today was:
    50 - 0
    100 - 1.7
    150 - 3.8
    200 - 7.0
    150 - 13.2
    400 - 20.4

    This was at 76 degrees with a 2-4mph wind left to right
     

    Dthomas3523

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  • Jan 31, 2018
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    I’m at 7.2 to 200yds with 71deg and close to sea level.

    This is dope that has been trued and used many times. I have a lot of trust in it.

    Sk standard plus with a 30yd zero
     
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    Huskerhunter

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    Funny, I've got a similar issue -- Using Center X with a CZ 457. I'm working in MOA but my difference is similar. I'm using a NF scope with hash marks so I'm pretty sure it's not a scope tracking problem. I did realize my target is actually 206 yds vs 200, but even with that adjustment it's off about 3.5 MOA using both Strelok Pro and Ballistic AE.
     

    74gtf100

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    Funny, I've got a similar issue -- Using Center X with a CZ 457. I'm working in MOA but my difference is similar. I'm using a NF scope with hash marks so I'm pretty sure it's not a scope tracking problem. I did realize my target is actually 206 yds vs 200, but even with that adjustment it's off about 3.5 MOA using both Strelok Pro and Ballistic AE.
    I tried kestrel with ab, ab mobile, strelok pro, and hornady 4dof. All were off and could get every yardage lined up. What I ended up doing was using ab mobile i have a profile for 0-100y and a 100-300y profile. Thats the only way I could get the dope across the board to line up perfectly. Doing this worked great yesterday..took 4th at a match and cleaned a stage out to 300y on prairie dog size targets
     

    Nik H

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  • Jan 22, 2014
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    I have a kestrel 5700 sportsman with AB, Applied ballistics mobile and strelokpro mobile and i cant get any of them to line up anywhere close out to 450-500. I know my confirmed dope with my vudoo is as follows:
    50y - 0mil
    75y - .6mil
    100y - 1.7
    200y - 9.6

    The problem is most of calculators say I should be around 7.2-7.5 for 200y but ive shot 3 different times and everytime 9.6 was dead on a waterline mark on the plate. Ive tried pulling BC and the typical truing methods with no luck. Any helps would be awesome.
    My predicted DOPE from ColdBore @ 200 yards is given as 8.6 Mils and my true DOPE is ~8.8 Mils. I can't ask for better correlation from a projected result.

    Some questions that I have
    1. Do you have true or measured DOPE at 300 yards?
    2. What ammo are you using that produces your measured DOPE?
    3. Have you tried other ammo to determine how stable your 200 yard elevation correction is?
    4. What BC value are you using in the calculator?
    5. Have you chronographed the ammo you are using to get actual MV?
    I find that rimfire is a bit difficult to predict for a couple of reasons.
    1. Stable BCs...bullets are lead so variability is there. There have been some historical papers written that publish BC values for rimfire. AB has also included some measured results in one of their books.
    2. Lubricants on the bullet affect results IMHO.
    3. Primer material consistency is not like centerfire so consistent MVs are sometimes difficult depending on the brand and type of ammo.
    4. Barrel fouling makes a difference. Are you shooting and cleaning and shooting or is the barrel properly fouled throughout the process.
    Once you get over trying to have a calculator predict this stuff and just go with your measured results, you will be better off....provided it is consistent
     
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    CRPS Shooter

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    Did you check your velocity in the cold? I find center x is very temp sensitive. That could be the issue.
    Custom drag models are generally better the G1 or G7 BUT they will not always work. The Applied Ballistics Lapua Center X CD in only good till 200 on the ammo I have and the Lapua app is good (I've only tested to 400) for the SK line as well. Note this is with my lots of ammo. This has also been the case with one of my fellow competitors.
    If you are using bc based calculations typically you will have more accurate results with G7 over G1 if you are trying to true data out to 250+.
     

    Dthomas3523

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    Unless you’re strapped for cash, the easy button is upgrade and use the dsf function.

    You can basically just take 6 distances and tell the software what your curve is vs trying to manipulate it to match.

    Unless on a budget, I can’t think of any reason why anyone shooting practical Rimfire isn’t using it.
     

    CRPS Shooter

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    I might be the odd duck here but i only use a phone app to get data trued up then export into a spread sheet and create a book with my tables. At a match I almost never use my apps. So i only run a cheap kestrel. I do wish the Applied Ballistics phone app had the dsf. It does have a truing of sorts built in but it doest work with subsonic only flight.
     

    CRPS Shooter

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    Unless you’re strapped for cash, the easy button is upgrade and use the dsf function.

    You can basically just take 6 distances and tell the software what your curve is vs trying to manipulate it to match.

    Unless on a budget, I can’t think of any reason why anyone shooting practical Rimfire isn’t using it.
    A couple of the guys i shoot with have had issues with the 5700 kestrel shutting down in the cold so ive steered shy and stuck to paper.
     

    Dthomas3523

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    A couple of the guys i shoot with have had issues with the 5700 kestrel shutting down in the cold so ive steered shy and stuck to paper.
    Everything fails and if you take a couple examples as a basis of opinions, none of use would be using anything.

    Besides, you can write down what the kestrel says beforehand. The point being, dsf is about the easiest and best way to true a .22.
     

    CRPS Shooter

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    Everything fails and if you take a couple examples as a basis of opinions, none of use would be using anything.

    Besides, you can write down what the kestrel says beforehand. The point being, dsf is about the easiest and best way to true a .22.
    I agree. I would gather your saying that you have had no issues with the cold?
    The dsf is the only part I wish I had. I think the incentive to get one would be greater if we shot 22 ELR but as of now we typically only see one long range stage max 400 yd. Typically a average distance of 150-200 yds.
     
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    LastShot300

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    What is the farthest range ballistics predictions become troubled? Asking because I've read many times of shooters reaching 500y and even more apparently with ease
     

    Nik H

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    In my case, ColdBore is pretty accurate to 300 yards. It begins o diverge from reality such that at 400 yards it is not accurate.

    @Dthomas3523 brings up a point that I did not consider. The DSF function is something that I never thought to try. I can't see why it shouldn't work for a rimfire cartridge and I bet that 500 yards would be a range it would use to calibrate.

    Has anyone given this a go?
     
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    Dthomas3523

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    In my case, ColdBore is pretty accurate to 300 yards. It begins o diverge from reality such that at 400 yards it is not accurate.

    @Dthomas3523 brings up a point that I did not consider. The DSF function is something that I never thought to try. I can't see why it shouldn't work for a rimfire cartridge and I bet that 500 yards would be a range it would use to calibrate.

    Has anyone given this a go?
    I’ll mess with it to 500. Works perfectly to 350 or so that I’ve done.