Holding over compared to dialing in MOA

[Darryl Cassel]

Tiro

The further you reach out, the more problems are encountered as the bullet slows down.

Yes indeed, the sighter shot does eliminate many of them (at the distance we shoot)and that's why I mentioned the different styles of shooting/hunting, the range your attempting to reach out to and also the equipment used.

We are usually (not always) setup in a stationary setting with heavy bench style guns, heavy tables and extreme long barrels on our big rifles.

Like I mentioned, it's not for everyone but, most Longrange hunters in our area of the State, hunt the same way.

Even in a thick area, a person with a good set of bigeyes can see the vapor trail and bullet impact (normally) going into the target.

To each his own though on this topic.

I know what the Longrange hunters do here and when we go out west for elk and mule deer.

Later
DC [img]images/icons/smile.gif[/img]

[Brent]

Tiro,

A couple questions to clarify things I may misunderstand you on -

I use the Exbal program on the Palm, and come-ups from 100 yard zero are what I work from.

1) Are you saying you recommend setting the turret to 0 for your 100 yards zero, as I normally do?

2) Are you saying you leave the LOS parallel to the BL until you're ready to take a shot?


If I work with a come-up chart from a BL drop standpoint, this would be very confusing.

Maybe I misunderstand your suggestion?

[TiroFijo]

Hi Brent

1) I recommend setting the turret 0 to match your "scope elevation" 0.
Theoretically this is parallel to the bore; this is not at rest but at the moment of bullet exit because there could be some angle due to harmonics or "jump" at the time the bullet exits the muzzle.
For example for a 308 firing a 175 SMK @ 2700 fps, std. cond., sight height is 1.7" and drop at 100 yds is 2.5". No matter what the original angle between scope erector and bore is, or what is the "jump", at the moment you are zeroed at 100 yds you have dialed into the scope:
A = (2.5" + 1.7")/1.047 = +4.0 MOA of elevation
Instead of setting the scope 0 at this point, I would substract 4.0 MOA and set the turret 0 there.
Your "scope elevation" for 100 yds will be 4.0 MOA from your scope 0.
If you normally dial 7.7 MOA to get to 400 yds from your 100 yds zero, now your "scope elevation" for 400 yds will be 4.0 + 7.5 = 11.5 MOA from your scope 0.
Etc.

2) You can leave the turret in any position, but (as with any scope) must remember in wich turn you are.