45 Acp

[jalley]

I'll actually answer your question since other members seem to want to tell you that you shouldnt be worried about shooting out to 100 yds.

Anyway, the amount of drop depends on the weight of the bullet and its velocity. A 230gr bullet with a muzzle velocity of 850fps will drop about 7 inches at 100 yards.

[jtkratzer]

Originally Posted by jalley

I'll actually answer your question since other members seem to want to tell you that you shouldnt be worried about shooting out to 100 yds.

Anyway, the amount of drop depends on the weight of the bullet and its velocity. A 230gr bullet with a muzzle velocity of 850fps will drop about 7 inches at 100 yards.

was that necessary? not everyone said that shooting 100 yards isn't something to worry about. I specifically asked what type of shooting this person was doing to find out specifics.

[CTrider XD]

Thanks for the replys, Yes, adjustable sights might be the answer for me.

Originally Posted by jtkratzer

well, ok, that makes sense, 75 feet is significantly different than the 100 yards in the first post.

i guess if you're target shooting at 75 feet, and your shooting lowing when aiming dead center, get adjustable target sights or shoot enough to figure out what your point of impact is when your shooting dead center at 75 feet. then you can figure out how many inches you need to compensate.

i wouldn't think there would be much drop at all at 25 yards. 830 ft/sec means that bullet is covering those 75 feet in less than 1/10th of a second.

[Rustynuts]

ALL bullets accelerate vertically (drop) at the speed of gravity, 32 ft/sec^2. It's pretty much just a matter of velocity (how far it travels as it falls). In a vacuum you could calculate this exactly. Real world you have other "minor" effect going on like air drag on the bullet causing it to slow down as it goes, the spin due to rifling, cross winds, etc. Basically if you fired a bullet and dropped one at the same time from the same height, they should hit the ground almost simultaneously (assuming you fired perfectly level). I'd bet the fired bullet might stay up a fraction longer due to the mentioned aerodynamic effects, but I'd also bet it's milliseconds. Bullets don't float on air!

[CTrider XD]

Thanks Jalley,

Originally Posted by jalley

I'll actually answer your question since other members seem to want to tell you that you shouldnt be worried about shooting out to 100 yds.

Anyway, the amount of drop depends on the weight of the bullet and its velocity. A 230gr bullet with a muzzle velocity of 850fps will drop about 7 inches at 100 yards.

[Frisco Pete]

With a 25 yard zero using Winchester 230-gr. FMJ (but other stuff would be close enough) according to the Oehler Ballistic Explorer you get:
25 0
50 -2.64
70 -7.32
80 -10.54
100 -18.79
125 -32.57
150 -50.36
200 -98.53

Of course the program has you put in variables like altitude, humidity, temperature etc. and gives out figures to the second decimal that are unrealistic in your ability to hold or ammo variation, but you get the idea of how much to hold over if you want to pop something waaayy out there.

[fritzmeister]

Well, I don't know how high up I had to compensate with my XD 45, but this is what the 230 grain bullets look like after they hit a metal man sized air tank at 100 yards with a heavy cross wind. I know it was 100 yards because I had my laser range finder and ranged it. I was sighting in my new varmint rifle, and my buddy said that I couldn't hit the barrel from there with my 45. I hit it about 6 or 7 times out of about 12 or 13. I don't remember exactly. I hit it the last four times in a row too.

[BoostLover]

Originally Posted by Rustynuts

ALL bullets accelerate vertically at the speed of gravity, 32 ft/sec^2. It's pretty much just a matter of velocity (how far it travels as it falls). In a vacuum you could calculate this exactly. Real world you have other "minor" effect going on like air drag on the bullet causing it to slow down as it goes, the spin due to rifling, cross winds, etc. Basically if you fired a bullet and dropped one at the same time from the same height, they should hit the ground almost simultaneously (assuming you fired perfectly level). I'd bet the fired bullet might stay up a fraction longer due to the mentioned aerodynamic effects, but I'd also bet it's milliseconds. Bullets don't float on air!

This is almost exactly accurate. All bullets accelerate vertically (drop) at approx 32 ft/sec^2 in a vacuum. Assuming that they have no initial vertical velocity, all we need to know is the approximate muzzle velocity of the round and the cd (coefficient of drag) of the round to find the time it took for your round to travel 100 yards.

Once we have the time, we can apply the vertical acceleration to get the position of the round (its vertical drop) and figure out about how much the round dropped.

The real world factors such as drag could potentially be ignored for very small times (i.e. << 0.5 second) but become a major, exponentially increasing factor as time goes on.

On a totally different subject, how did you hit a target with a handgun from that far away? I find that it's impossible for me to get good hits above 25 yards because the front sight obscures my entire target.

[fritzmeister]

Well, once I figured out the windage, and elevation, I just picked a spot on the side of my slide and held it there. It was windy, so I could sight off of the side of my slide. It took, what seemd like forever, to here the "thunk" of the bullet hit the tank.

They still penetrated the first layer, but never made it out the other side. When I went back there later, I heard bullets clanging around inside when I rolled it. I only got three to fall out, even though there were still some inside.

[stroker]

I bet it ain't dropping at all in 75 feet. I would think that the poi needs to be allowed for & compensated