Need help with 500 yard trueing up calculator on a 6 CM

[B Harrison]

What bullet are you shooting and have you chronographed the current ammunition you are using?

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Fed factory 107 SMK
And yes all current for lot number.
I have had this issue for a couple weeks.

I thought adjusting true velocity would give me the correction, but it did not.


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[Castle Rock]

List your details and someone will run the numbers for you in a different program

 

[B Harrison]

List your details and someone will run the numbers for you in a different program

I’m going to take the initial advice and check 0 again. Then shoot a larger sample for velocity, and try to get a better angle on the wind.

Yesterday the wind was 1-2 mph to my back so couldn’t have caused me to be 1/2 minute low.

I’m also going to put a group of 5 on paper at 300 and then come back to the experts with complete information.


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[Macintosh]

Fed factory 107 SMK
And yes all current for lot number.
I have had this issue for a couple weeks.

I thought adjusting true velocity would give me the correction, but it did not.


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Can you clarify—I may have misunderstood but I’d thought you said you were using a chrono’d velocity from a different gun. Did you chrono that lot of ammo in that specific gun? If not, thats what you need, the same ammo will have different velocity between different guns.
Then double check all your app inputs and follow post #2. You can then true BC to line up with your actual dope.

0.5moa is also almost certainly within the cone of your rifle. You may simply be seeing an artifact of a small number of shots. If your zero is off by even 1 click as a result
of adjusting off only 3 shot groups, then when combined with small groups, even with an exceptionally precise rifle that can easily show up as an apparent 0.5moa error. Plus you need to know the size cone you are shooting to say whether any shot is inside it or not. So for certain you need to shoot at least 10-round groups (if not larger) for some of this initial setup.