BDC- Turrets

[kevinll]

Newbie question,
On my Leupold BDC it has two rows of numbers, the top row represents the calibrated yardage marks as I understand it, what does the bottom row mean? My example: BDC for 300 Mag., 1 click = 1 min., 1-10 on top row, 0-60 on bottom row. If I want more accuracy at longer ranges is there a way to use this cam?
thanks, Kevin

 

[kevinll]

Ok,
maybe my question doesn't make sense!
I'll rethink it.

 

[Buffalobob]

It is not that it does not make sense. It is mainly that I have not ever seen the exact knob.


Take your question and go to the Leupold web site and use their "product specialist" email and ask them the question if no one on this site knows the answer.

 

[Shawn Carlock]

Kevin,

You have a 3.5-10 LRT M3, the top row 1-10 represents 100 of yards based on certain ballistics for a 300 Win, the bottom row is 0-60 in increments of 5 and represents the number of MOA you are on. This is a good deal since the caliberation at longer distances is seldom spot on, this allows you to develope a drop chart based on whole minutes of angle if in fact the 1-10 cam marks don't work with your rifle / load combo.

 

[kevinll]

Shawn,
That is what I was hoping to hear. I am guessing that the only to develope a drop chart is to shoot at all different ranges to determine the bullet drop at those distances? Thanks, I feel I am getting closer to understanding some of the long range shooting.
Kevin

 

[kevinll]

Buffalobob,
thanks for the response, I am just in a hurry to learn /ubbthreads/images/graemlins/smile.gif

Kevin

 

[Shawn Carlock]

Kevin,

You can start with a computer generated drop chart but you will need to confirm it by physically shooting the distances.

 

[YOTES2CALL]

Do you have a ballistic program ?

If not, post your altitude, temp, fps, bullet size, bullet weight,sight in distance, sight height above bore, and we can get you a drop chart to start out with....

Yotes

 

[kevinll]

Yotes2call, thanks,
The rifle is a 300 WSM. It has the "300 mag" cam on the scope.


Altitude--7700 (hunting area), 120 (home)
Temp.-----40 ( best guess of avg. tenp.)
FPS-------2950 ( I think I read this on bullet website)
Bullet Diameter- .308
Ballistic Coefficient- .509
Bullet weight- 180
Sight in Distance- 200 yards
Sight hieght above bore- 1.5 (i think)

these are what you need, I think!! Let me know.

Kevin

 

[YOTES2CALL]

Kevin,

Target MOA elev.(in) Vel.

100 -1.5 1.5 2759
200 -0.0 -0.0 2577
300 2.25 -6.8 2401
350 3.25 -12.4 2316
400 4.75 -19.6 2233
450 6.00 -28.5 2152
500 7.50 -39.4 2072
550 9.00 -52.2 1994
600 10.75 -67.3 1918
700 14.25 -104.6 1772
800 18.25 -153.1 1632
1000 27.75 -291.5 1384


Test against those and see what happens.... based this off your 120 elevation at home.

YOTES /ubbthreads/images/graemlins/grin.gif