01-31-2012, 01:22 PM
neandrakall Wrote:I have a trijicon mil dot 2.5-10 Power scope and am wondering about hold over from a 100 yard zero. I know mil dots can be used for a range finding apparatus at 10 power on this optic but am wondering if anybody has any input for a consistant hold over without doping my scope seeing it doesn't have external turrets, although it has target style adjustments under dust caps. I am shooting 123gr rounds right now but plan on reloading my own 100 or so gr. rounds quite soon. Any pointers would be greatly appreciated!!! Thanks!
BD:
Just curious. What does 'doping the scope' mean? Do you mean putting elevation on your scope?
Some things to consider.
Your initial zero will be different between what ever 123 grain loads you are using and what ever 100 grain loads. So, you will have to adjust your optic when switching loads and this will be both elevation and windage. It is best to find this initial zero and the difference at 200 yards and not 100 yards. 100 yards is too short a distance to come to good conclusions on zero differences and accuracy. In fact, I would say this is important enough that you should sacrifice a day to drive to a range that is at least 200 yards measured distance with 300 yards being better.
Next thing is to get a chronograph and chronograph each of your loads so you can run them through a ballistic computer and find elevations at various distances so you can figure out how many mil hold over you need for certain distances.
Can't say that I have heard of someone starting at 100 with mil holds. Generally they start at 300 but the use of such holds is marginal when you hit 600, even with a TMR reticule that has 1/2 mil ticks. Also, it gets pretty hard to use holds over three mils and harder still to use holds that involve both elevation and windage when either gets over two mils.
Another thing. All small arms ammunition holds pretty much the same ordinate to 300. Generally five to eight inches of ordinate. Zero at 300 and if you are using kill zones of about 20 inches or more, a center hold will get you from your barrel to 300. Use the mils for distances past 300 but you will lose precision very fast once you hit 600 and or if you start going into mil holds of over two mils.
LR1955