## Ballistic drop question

11/12/19 @ 1:12 PM
ORIGNAL POST
PimplySwede
User since 1/6/09

OK, for those of you with a head for these numbers......

I just bought a rifle for my son - Remington 7600 .243.  Went to sight it in.  At 25 yards, it was 3" low (dead center, just low).  Using 100 grain Core Lokt rounds.

I re-zeroed in at 25 yards, so I know it will be about 3" high from 100-220 yards, then zero again at 250.

Assuming the rifle was on-target from whoever sighted it in previously, what would the zeros be - I can't reverse-engineer the numbers.

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11/13/19 @ 11:37 AM
PimplySwede
User since 1/6/09

I'm thinking you're right - there's no way the gun would ever zero if it's 3" low at 25 yards.  It would just keep dropping.

11/13/19 @ 11:20 AM
PimplySwede
User since 1/6/09

"Personally I sight my .308 at 2 inches high at 100 . Then it about dead on at 200 . "

Hmmmm.....isn't that sighting for both the rise and fall?

11/13/19 @ 11:16 AM
PimplySwede
User since 1/6/09

I've always zeroed my guns at 25 yards, mostly because of available space to do it in my back yard, I can get on paper much faster if the scope/rifle is new and way off, and eliminates the need for a spotting scope or running downrange and back.  It's worked for 40 years now.

I played with a ballistics chart and the trajectory for the .243 using a 100 grain round is different if you sight in at 25 vs 100.  100yards gives you a flat trajectory out to about 180 then starts dropping fast, with zeroes at 40 and 100, but then you need 100 yards to sight it in.  Sighting in at 25 puts your zeroes at 25 and 250, then drops.

I was just curious if anyone knew the math to figure out what the zero would be if the gun was 3" low at 25 yards.

11/12/19 @ 7:51 PM
river_chaser
User since 10/3/12

I am looking at a ballistic chart right now and all I can arrive at is If it WAS 3 inch low at 25 yds I would say the previous shooter never had it zeroed on any distance correctly.

Am I missing something?

11/12/19 @ 6:55 PM
bassmaster+recordracks
User since 2/25/12

All primers are different. I suggest to use Remington bullets. You may be using them already. My girlfriends axis savage is not that far off as you say. Those ranges way less than 3 inches.  Everyone’s eyes are different. How many rds did you shoot?

11/12/19 @ 5:17 PM
One shot one kill
MEMBER since 8/12/02

Wow , I never sighted for both the rise and fall of a bullet  .  Best would be to get to a 100 yard range  . A 25 yard shot does happen  , but I'd rather know where it is at a distance  .  Personally I sight my .308 at 2 inches high at 100 . Then it about dead on at 200 .

DISPLAYING 11 TO 17 OF 17 POSTS