1000m .308 win load options

168bergersapper

168bergersapper

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So I had my first 1000m range day today. It was truly a dream come true to have an opportunity to do so. unfortunately we had a terrible 1/2 value 20kmph - 30kmph wind which undoubtedly increased the learning curve. Though still managed to get a dozen rounds, or so, on a 15x15 target. Anyway I'm just wondering what kind of loads other .308 guys are using at or beyond this distance? I'm shooting a savage 10TR .308 with a Nightforce NSX 8-32 in a Near alpha mount. My load is Lapua brass, Fed 210M, Berger 175 OTM, 42 grn varget.
I'm all out of 175 OTM now and was thinking of working up a different load.

Thanks
 
Nothing wrong with the 175. At 42 grains what's your velocity? Do you have enough velocity that you stayed supersonic at 1000?
Jerry should chime in he has lots of good info.
I played with 215s awesome acuracy for me to 600 yards but after that they fell off. Some vertical started to show up. I have been playing with 185 vlds (just because) they have been working out.
Lots of guys are going back to traditional Bullets primarily the Berger juggernaut and giving up on vlds and hybrids they tend to be finicky sometimes at long range. I am still up in the air the big players are still using hybrids so... I am not giving up on them just yet.
 
It was suggested to me to use the 185 juggernauts....so I am. I'm trying varget first. Lapua brass, that I just primed with federal 210 match primers about 7 minutes ago.
 
twosmokinspades said:
Nothing wrong with the 175. At 42 grains what's your velocity? Do you have enough velocity that you stayed supersonic at 1000?
Jerry should chime in he has lots of good info.
I played with 215s awesome acuracy for me to 600 yards but after that they fell off. Some vertical started to show up. I have been playing with 185 vlds (just because) they have been working out.
Lots of guys are going back to traditional Bullets primarily the Berger juggernaut and giving up on vlds and hybrids they tend to be finicky sometimes at long range. I am still up in the air the big players are still using hybrids so... I am not giving up on them just yet.
Click to expand...
I ran my load through the chrony this morning with an average of 2601 fps.
 
Basically I'm thinking of developing something that may see improved performance in the wind. If anything good came of today's weather is seeing for the first time the drastic effects Of weather on ballistics.
 
Here's what Strelok says about wind with the juggernaut at a predicted MV of 2750

What do the ones your thinking of show??

EDIT: Since i, AGAIN, can't post a pic properly from my iPhone, the charts shows a 6.5MOA drift at 1000yds from a full value 10MPH wind.

F would it be nice if this app worked properly.
 

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Gunneegoogoo said:
will get pushed around more in the breeze....
Click to expand...


Ran some numbers through the Sierra ballistics program...
A 155 Scenar launched at 2850fps will have 8.7 minutes of drift at 1000 with a 10mph wind. This is the observed velocity from my 27" Rock Creek barrel. 30" TruFlite is 2950.
With the 175SMK:
2800, 9.3moa.
2850, 9.0moa.
2900, 8.8moa.
I suspect that achieving these velocities might be problematic.
So no, the 155 Scenar will not get pushed around more in the breeze.
 
TR shooters have been shooting 155's at 1000y with 45-46g of Varget for a long time, because it works.

Other, higher BC bullets are definitely a good option, but you can not buy V Bulls.
 
tiriaq said:
Ran some numbers through the Sierra ballistics program...
A 155 Scenar launched at 2850fps will have 8.7 minutes of drift at 1000 with a 10mph wind. This is the observed velocity from my 27" Rock Creek barrel. 30" TruFlite is 2950.
With the 175SMK:
2800, 9.3moa.
2850, 9.0moa.
2900, 8.8moa.
I suspect that achieving these velocities might be problematic.
So no, the 155 Scenar will not get pushed around more in the breeze.
Click to expand...

Thank you.
 
If mag feeding, consider the 175gr TMK and 190gr MK, Berger 185gr OTM and Juggernaut/BT.

Always remember that the 308 is going to get bounced around in the wind at distance... no way around it. By getting better at judging the winds, you can make alot of bullets hit the target with success.

If single feeding and you have throat length and don't mind the recoil, Berger 210gr VLD has been working great for me. Also hrn 208gr amax and BTHP... not sure about the new gen ELD bullets as I have not shot them yet

Setting up with the same barrel length and chambers as FTR rifles, it will allow you more case capacity to launch these big heavy slugs way out there. BC is only 1 measure of how consistently a bullet can reach out. The bullet has to be stable enough to go transonic and subsonic. Then it has to have enough inertia to not bounce around too much.

I have shot the Hrn 155gr Amax out to 1450yds a long time back when I was getting into ELR shooting. Accuracy was no problem and the bullet handled going subsonic without fuss.

But today, many designs favor supersonic flight over transonic and subsonic flight so you really need to test them at distance... some will, some will not.

Jerry
 
tiriaq said:
Ran some numbers through the Sierra ballistics program...
A 155 Scenar launched at 2850fps will have 8.7 minutes of drift at 1000 with a 10mph wind. This is the observed velocity from my 27" Rock Creek barrel. 30" TruFlite is 2950.
With the 175SMK:
2800, 9.3moa.
2850, 9.0moa.
2900, 8.8moa.
I suspect that achieving these velocities might be problematic.
So no, the 155 Scenar will not get pushed around more in the breeze.
Click to expand...

I too ran some numbers.

A 185 juggernaut leaving the muzzle at 2750, which shouldn't be hard from a 30" barrel, has 6.5MOA of drift at 1000yds with a 10MPH full value wind. So yes, the 155's do get pushed around more.

How is this not less that the 9-ish MOA you just quoted for the 155?

I know the answer is to just click over more, and that's fine, but more drift is more drift.
 
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You were responding to 6MT's question about the 175 SMK (not the 185 juggernaut) when you said the 155s would be pushed around in the breeze.
 
I don't know what velocity could be achieved with the 175SK and a 30" barrel.
I have chronographed 155AMAX bullets at 3050 from the 30" TR. These AMAX aren't vlds - just as the classic 155SMKs and Nosler 155s aren't. 155s exist because of the rules for TR/Palma competition. VLDs like the Scenar, Berger optimize performance for the weight.
I have been shooting a .260 with 139Scenars the last two seasons. Clocked at 2850, 1000m drift with 10mph crosswind is 6.7 minutes.
A more efficient bullet can mitigate errors in wind settings.
 
Good to know.

I have a pile of 139's for my .260 modern hunter, when it gets here.

Just ran the 175HP SMK at 2850 (100fps more). 7MOA of drift.

A tipped MK 175gr, 6.3MOA
 
I really like the .260, after years of shooting .308.
There are lots of excellent choices for shooting at longer ranges. The enhanced performance .30 bullets are really significant for F-TR with .308.
 
Here's what you should be shooting if you pick the 155 class of bullet...155.5 Berger.
A pointed 155.5 full bore Berger bullet has a G7 of approx. .250, launched at 3030 fps will require 7.6 moa of deflection in a 10 mph crosswind. An unaltered 155.5 Berger has G7 of .243 and will drift 7.9 moa at a grand. A 185 Berger Juggernaut has a G7 of .283, launched at 2750 fps will require 7.5 moa of deflection in a 10 mph crosswind. These measurements came from JBM at 59 degrees F., 40% humidity, and 600' ASL. BTW, 155.5's are more readily available.
 
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