Need experienced advice-Ballisticards/Springfield Scope


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RD10
February 15, 2006, 05:51 PM
I am looking for some ballistic/zeroing advice from someone with some experience with the Springfield Armory scopes and Ballisticards.

I have a 4-14 x 56 Mil Dot Government Model 7.62mm scope mounted on my Remington 700 PSS. I am issued and solely use Remington 168 gr. BTHP Match ammunition. I also have the Ballisticards for this caliber, which are set up perfectly in yards.

Here’s my dilemma: Yards versus meters. The scope is calibrated for bullet drop with automatic holdovers up from 200-1000 meters, with a 200 meter zero. I know I can make my own ballisticard on the computer set up for meters after doing some calculations, but my rangefinder is in yards, most ranges are set up in yards, and our qualification courses and training is all done in yards. And, I have to keep a 100 yard zero, per policy, training, and that’s what .308 ballistic charts are based upon. I’d like to be able to use the automatic holdovers, but how?

As for the mil dots, they’re a separate issue from this.

Should I just ignore the holdover marks on the scope and stick to the Ballisticards?

Any thoughts or suggestions on how to keep this simple, or something I’m missing here?

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ocabj
February 15, 2006, 06:14 PM
Yes, forget about the holdover marks in the scope and stick to your ballistic cards, assuming they are accurate.

Do the holdover marks even work for your ammunition?

RD10
February 15, 2006, 07:51 PM
It is calibrated for the 168 grain bullet.

ocabj
February 15, 2006, 08:14 PM
It is calibrated for the 168 grain bullet.

I was just wondering if it worked properly with your specific ammo. The bullet drop over distance factors not only the bullet weight, but also the bullet's ballistic coefficient and the muzzle velocity of the bullet.

30Cal
February 15, 2006, 08:37 PM
Temperature matters a lot as well. The difference between a 70º day and a 90º day is about a full minute.

What is the distance for you qual course and size of targets? It's probably not going to matter much until you get past 300yds.

Ty

RD10
February 16, 2006, 04:37 PM
When I contacted Ballisticard Systems when I originally ordered the cards, they said that the cards are for the Federal 168 grain BTHP Match round. But, that the ballisticards are close enough to the Remington that it would make no noticable difference. This has pretty much held true.

The cards I bought are a set of three for the different temperature extremes.

Our qual course is 100 yards, but have shot to 200. Never much more.

30Cal
February 16, 2006, 06:03 PM
Our qual course is 100 yards, but have shot to 200. Never much more.

I'd be surprised if the difference between the drop/windage for yards vs meters is more than a quarter minute at 200yds.

Remington788
February 19, 2006, 09:28 AM
If you are only concerned about 100-200 yard shots, then I wouldn't worry to much about it since the trajectory isn't going to change that much.

Now, if you want to really make sure. Since your scope is in meters and you want to shoot yards, set up targets at every interval that is marked for the BDC and test it. As an example, put a target at 500 yards then use the 500 meter mark and see where the bullet goes. Then record the information and add that to your Ballisticards.

My guess is that you will shoot high when using the BDC since 500 yards is equal to 457.2 meters

RD10
February 19, 2006, 05:32 PM
Gentlemen, Thanks for the advice. As a side note, I am a member here and at another forum. I put this same post on the other forum and only got smart replies about my equipment. Thanks again.

taliv
February 19, 2006, 09:20 PM
When I contacted Ballisticard Systems when I originally ordered the cards, they said that the cards are for the Federal 168 grain BTHP Match round. But, that the ballisticards are close enough to the Remington that it would make no noticable difference. This has pretty much held true.


the remington cartridge almost definitely uses the same sierra bullet. find out what the velocity of the remington is and compare it to the federal.


inside 200 yrds, none of this will matter, but just a word of warning/advice if you ever shoot longer distances: don't rely on the ballisticards. i mean, they're a good start for come-ups but don't expect them to be your actual zero. go shoot the ranges with your ammo/gun and log it, then rely on your data-book for answers.

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