MILDOT HOLDOVERS

[russ10x]

Any help out there! Had all my holdovers for my SWFA s s 10x42
All set up, graph' d with a MILDOT reticle (posted here before by me). Working great,w/zero at 50 yards, 100 yards was 2.1 MILS. holdover. Changed to a SWFA S S 20 x 42, tried the same holdover. Off target . Put a 3.1 MIL hold over, nails the bull. 1.0 MIL more. Again at a 50 yard zero. Any thoughts? The ballistcs were JB.

 

[RTH1800]

Re: MILDOT HOLDOVERS

Scopes are not true mil dots, they are just dots.
NOt all that uncommon in the lower end scopes. They will still work, just need new data.
I really cannot hold exact enough with the Mil dot to shoot the . 25 moa targets I am after with a .22 RF. Prefer a fine reticule. JMO

 

[RTH1800]

Re: MILDOT HOLDOVERS

In my expirence only the top end scopes are exact as far as adjustment and reticule sizing. Absolute precision of mfg does not lend itself to cheap production. If the scope to bore height was not changed, one or both of the scopes in not a true mil spacing, just as many scope clicks are not exactly .25 moa or .1 mil.

 

[russ10x]

Re: MILDOT HOLDOVERS

to answer some of the questions...
it was the same lot of ammo, the scope/bore hieght remained the same. The magnification is all that was different. The SWFA reticals, although a low end scope, have been known to be pretty tight. Using the 10 power, it was spot on the come up tables recently published in an article for Precision Rimfire Comp. Also, doing the math for hold overs, it was spot on there too, although only to 100 yards. The range I was shooting at was a scaled and registered range (using a range finder). I will just have to adjust my tables, but I will run out of holdover and have to use the top of the duplex as my zero mark if I want to do that, and use the whole 10 mils as a holdover. Thanks for the input

 

[russ10x]

Re: MILDOT HOLDOVERS

Again this was going from a 10 X scope to a 20 X scope

 

[russ10x]

Re: MILDOT HOLDOVERS

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[russ10x]

Re: MILDOT HOLDOVERS

We made up a simular sheet in our DOPE arm bands in the Army for the M24s...

 

[russ10x]

Re: MILDOT HOLDOVERS

Thanks. I agree with you. Just had a neck operation so I will not get to the range for a while. But I am going to try to figure this out. Thanks for the help.

 

[RTH1800]

Re: MILDOT HOLDOVERS

The power change should not effect it of course. Scope to bore height has not changed. Weather will not change it half that much. So, it is reticule issue IMO.

 

[TOP PREDATOR]

Re: MILDOT HOLDOVERS

with everything else being equal and using the same ammo, i'll wager $1.00 on the 10x to 20x change.

perhaps they didn't recalibrate (just speculating) for the 20X, much like using a variable power scope and not being FFP. the hold overs are going to change with every movement of the zoom ring.

you would think the hold over would be precisely doubled as 20x is twice as much as 10x, sometimes it's not the case if the mil dots are not exactly spaced correctly or of the proper "thickness".

being a fixed power there's no need for FFP, i'd wager another $1.00 that your ranging data is off too. set up a known sized target and range it now with the 20x. if it's off your previous data on the 10x (hopefully you had some) you'll know the deal.


savage mkii F zeroed at 50, 2mil holdover at 100 on 10x, 3mil holdover on 15x. (not a SS, not a true mildot or FFP).

savage mkii BV zeroed at 50, 2.5 mil holdover at 100 on 10x, 5 mil holdover on 24x (not a SS, not a true mildot or FFP). more than double the magnification, yet only doubling the holdover.

 

[Pat M]

Re: MILDOT HOLDOVERS

height of ring (bore height / center of scope - center barrel) will change drop

? maybe changes more on 22lr


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