Federal 308 168SMK BHTP max range via Viper PST 6-24X50 gen1 EBR-1 reticle

[red_star]

I'm new to long range shooting, my range only has max of 100yd and would like to explore more further.
The scope above is sitting on a Remington 700 5R.

Would like to ask if my analysis/calculations are correct.
I have a 0-MOA base zeroed the rifle @ 100yd. Then installed the CRS shims.
I verified that I have 83 elevation turret clicks available. 0.1mrad/click ~ 8.3mrads.

Below is the ballistic data n(bullet-drop) for Federal's 168gr 308 SMK

Looking at the 100-yd zero data below, this means I could only set my elevation until 78~79 clicks to hit the target @ 800yd.

But if I set my turret for 800 yd target, the holdover reticle of the scope still has 9mrads to compensate.

Here's the scenario:

1.) Does this mean that it is not enough to attain 14.5mrads to make a 900 yd shot?

OR

2.) I can still do the 900yd shot if:
I subtract 14.5mrad to 7.88mrad (which is the bullet drop data @ 800yd when zeroed @ 100yd) = 6.62mrad which is within the 9mrad reticle compensation?

TIA.

 

[bcboarder]

Are you asking if you dial up 7.8 mil to reach 800 yards holding the cross hairs on target could you use the holdover? If that's what your asking then yes put the 2 mil subtension centre of the target. Or dial all the way to 8.3 and put the 1.5 mil subtension slightly low of where you want to hit.

 

[red_star]

Are you asking if you dial up 7.8 mil to reach 800 yards holding the cross hairs on target could you use the holdover? If that's what your asking then yes put the 2 mil subtension centre of the target. Or dial all the way to 8.3 and put the 1.5 mil subtension slightly low of where you want to hit.

If I dial 7.8mil, (or the full turret @ 8.3mil), that will be considered as 800-yd zero and to pull a target for 900 yards on the table I needed 14.5mil more on the subtensions which only has 9mils left. Correct me if I'm wrong.
What I'm confused is why the there is so much holdover on 900yd (52.2") when zeroed @ 800 yd; as compared to 900yd (35.0") when zeroed @ 100yd.

 

[kthomas]

There's really no need to zero past 100 yards. No real advantage with lots of disadvantages.

If you want to shooter longer, do one or any combination of the following:

1. Holdover with the reticle - I still have to holdover with my reticles at home, even with my ~19-20 mils of scope travel, when I shoot far enough. Holdovers is a good still to have and utilize. Cheapest and most practical option.
2. Get a 20 MOA base, or rings such as Burris XTR's with added and interchangeable cant.
3. Get a scope with more elevation. ~ 8 mils of travel once zeroed is not much. But of course this is a pricier option then the ones above.
4. Take a class with C/S 66 or head to a training facility in the US, to understand the capabilities of your system, what it takes to shoot long range, and to learn/brush up on the fundamentals of marksmanship. Probably the best money spent in this sport (provided you go to a good training school, I would avoid almost all the Canadian shooting schools with the exception of C/S66) - I personally usually do one big training class a year.

 

[bcboarder]

I think you might be reading the table wrong. For example here's a pic of the table I use with my 308 shooting 178 eld-x bullets and a 100 meter zero.

The table above says I only need 1.7 mil to go from 800 metes to 900 meters.

 

[propliner]

There's something wrong with your calculator at the top. You should only need around 1.9 more mils to reach 900.

 

[Dr. Hunter]

Ya you're not reading something right, my handloads with 178 eldx bullets I need 1.7 mils to go from 800 to 900m and I'm shooting at about 2720 fps

 

[propliner]

It looks like a spreadsheet. Try putting the 800 yard zero in the first column if you want to see the drop from 800 to 900.

Zeroing distances of course will not change bullet drop but rather the point at which you measure the drop from.

I like Strelok, simple and proven accurate.

 

[red_star]

folks, thanks a lot for all the inputs and clarifications on this thread.
Still have to find a range in ON that with 1K yards. My range only has 100yd max and I was told yesterday by a member to check CFB Borden.

 

[maynard]

You need to check out the Ontario Rifle Association. Although the season is coming to a close and I doubt any more dates for Mons Range in Borden will be booked this year, there is always next year. I would forget about shooting 168 SMK's at long range. You would be better off with either 155's or 175's for anything over 600 yards.

 

[Ganderite]

The 168 has a short boattail. Sierra refers to the 168 as the "International" because it was made for 300 meter shooting.

They make the same bullet with a long range boat tail. called the 175 Match.

Get off the computer and onto the range.

We shoot longer ranges just about every week end at Borden.

I am hoping to host a 100, 200 and 300 yard shoot at Borden this fall.