rifle trajectory question

[grafsk8er]

i've got a .221 fireball sighted in at a 100 yards. some info: 3000 fps, 1.2 inches high at 100 yards with a 200 yard zero. now my question is. since my gun is sighted in at a 100 yards, and the scope is about 2 and a quarter inches above the center of the bore, where do you think the bullet will hit at about 50 yards? i ask becasue i'm going out coyote hunting tomorrow night and i don't want to have a miss hit if i shoot at a coyote at say 50 yards or so. thanks

 

[R.W.Dale]

The difference won't be enough to cause you to miss a Yote unless you're taking head shots.


I've found ballistics charts to only be good as a LOOSE guide. There is no replacement for actually shooting targets at the ranges you plan on shooting at

 

[langenc]

When sighting in any gun esp at 100 yds I always shoot a couple at closer targets so this info is known.

 

[PawPaw]

Good question, but without the BC of the bullet, I can't let my ballistics computer work.

However, for all practical purposes the boiler room of a coyote is about 4" by 6". At 50 yards that bullet is probably going to be within a half-inch of your aiming point.

Think of it like this. With a 1.2 inch midrange trajectory, your bullet at 50 yards is still climbing to midrange. It'll be less than an inch above your zero. But, it doesn't matter because the boiler room of the coyote is larger than that. Don't sweat it. Hold dead on and squeeze the trigger. The coyote will probably fall over.

 

[grafsk8er]

well, if this helps, the 1.2 inch mid range trajectory was from a gun with a sight 1.5" above the center of the bore. my rifle is 2.25" above the center of the bore. it has a bc of .255. 3000 fps. i would love it if u could plug it into your computer just so i can see, thanks

 

[rangerruck]

It will be 1.5 to 1.7 inches low at 50 yds...

 

[jmorris]

Here is what your looking for

http://www.eskimo.com/~jbm/calculations/traj_card/traj_card.html

 

[skinewmexico]

Great link. Thanks jmorris, I've been looking for something like that forever.