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How much drift at 75 yards?
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Author:  MyCrosman [ Sat Sep 10, 2016 6:02 pm ]
Post subject:  How much drift at 75 yards?

I'm shooting a 14 grain hollow point at 725 fps (75 yards)and the crosswinds where I shoot are almost always 90 degrees @ 20 kph.I've gotten pretty good at compensating but am wondering just how much drift there actually is at this distance.

Author:  Daryl [ Sat Sep 10, 2016 6:18 pm ]
Post subject:  Re: How much drift at 75 yards?

Since you shoot under these very conditions, you are the perfect person to do the empirical test. Every gun will display slightly different BC's for any 'given' projectile. Charts will only give an idea - your rifle actually shooting under those circumstances might drift less or more than an identical rifle shot with the exact same pellet from the same box. Every gun is unto it's own. Some guns shoot well & seemingly identical with the same pellets - many don't.
You can use a ballistics chart to get an idea, or simply shoot and find out yourself.

you could also use this program below or chair gun's program, which might also give you the average BC of the pellet you are using - or not.

http://www.shooterscalculator.com/balli ... ate+Chart+

Author:  Penage Guy [ Sat Sep 10, 2016 6:19 pm ]
Post subject:  Re: How much drift at 75 yards?

Without consulting a ballistics calculator, which answer is closest to correct?

With a 20 kph crosswind the drift at 75 yards for a 14.3 grain pellet with a MV of 725 fps will be one of the following:
a) 3" b) 6" c) 10" d) 15"

Author:  MyCrosman [ Sat Sep 10, 2016 7:15 pm ]
Post subject:  Re: How much drift at 75 yards?

Penage Guy wrote:
Without consulting a ballistics calculator, which answer is closest to correct?

With a 20 kph crosswind the drift at 75 yards for a 14.3 grain pellet with a MV of 725 fps will be one of the following:
a) 3" b) 6" c) 10" d) 15"



No idea....but since you won't tell me until I guess at it....I'll say d15 inches.

Author:  Penage Guy [ Sat Sep 10, 2016 7:31 pm ]
Post subject:  Re: How much drift at 75 yards?

The pellet drift is 10 inches.

Author:  Daryl [ Sat Sep 10, 2016 8:02 pm ]
Post subject:  Re: How much drift at 75 yards?

Which pellet is that out of all the 14.3gr. pellets?

Author:  MyCrosman [ Sat Sep 10, 2016 8:17 pm ]
Post subject:  Re: How much drift at 75 yards?

Daryl wrote:
Which pellet is that out of all the 14.3gr. pellets?

Daisy hollow point....I never tested them to see how they group....but I'm knocking small soup cans at 75 yds....so that's good enough for me....however......I have some 14.66 Excite Hammers on the way.A round pellet....sort of.....so I imagine a different result with these....should be interesting.

Author:  Penage Guy [ Sat Sep 10, 2016 8:53 pm ]
Post subject:  Re: How much drift at 75 yards?

I'm sorry -- I just double checked and did not have the correct pellet. The drift for a Crosman 14.3 grain pellet under the circumstances described would be just over 17 inches at 75 yards. My mistake. That pellet would drop almost 26" at that distance.

Author:  MyCrosman [ Sat Sep 10, 2016 9:03 pm ]
Post subject:  Re: How much drift at 75 yards?

Penage Guy wrote:
I'm sorry -- I just double checked and did not have the correct pellet. The drift for a Crosman 14.3 grain pellet under the circumstances described would be just over 17 inches at 75 yards. My mistake. That pellet would drop almost 26" at that distance.


No problem...That's why I guessed at 15 inches.....75 yds LOOKS like a long way off for 725 fps....lots of time for the wind to do its thing..

Author:  Daryl [ Sat Sep 10, 2016 10:19 pm ]
Post subject:  Re: How much drift at 75 yards?

Penage Guy wrote:
I'm sorry -- I just double checked and did not have the correct pellet. The drift for a Crosman 14.3 grain pellet under the circumstances described would be just over 17 inches at 75 yards. My mistake. That pellet would drop almost 26" at that distance.


Drop is 26" if sighted at what range?

Author:  Penage Guy [ Sun Sep 11, 2016 5:39 am ]
Post subject:  Re: How much drift at 75 yards?

Daryl wrote:
Penage Guy wrote:
I'm sorry -- I just double checked and did not have the correct pellet. The drift for a Crosman 14.3 grain pellet under the circumstances described would be just over 17 inches at 75 yards. My mistake. That pellet would drop almost 26" at that distance.


Drop is 26" if sighted at what range?


The drop would be from the apogee of the pellet's trajectory. How much any projectile will fall is, of course, determined by how long it is in flight and therefore how long gravity will be able to influence that flight. By the time the pellet in question has travelled 75 yards, 0.393 seconds will have elapsed (and its terminal velocity will be 460 fps). In that time, the pellet will fall about 26 inches.

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