What is the desirable ES and SD for .308?

[NC308]

Another question.

My accurate load at 100m has 2340fps and at 300m it seems to be accurate as far as I can tell with limited testing.

What would be the desirable velocity for a 185gn .308 Win round to be accurate at 300m or even at 600m?

Thanks You,
Tiago

i shot the 185 juggernaut at 2650 FPS out to 1000 yards with great success. At 300 it would shoot easy 1” to 1 1/4”.

 

[rardoin]

Reloading is easy if you stay off of the internet.
snip
If you are getting precision that is good enough for you with a factory rifle, and if you are not shooting long range don't get wrapped up in it and have fun. Find a load that works for what you are doing and shoot it.

^^^^^ "Paleface Wade speakum truth" ^^^^^

 

[willbas]

the best I have gotten

 

[Hohn]

I highly discourage anyone to run 20x bullets out of a 308 at 2800-2820 fps. I’m hoping that’s a typo on your part

The purpose was to illustrate the calculation process. I hope you understand that.

I suspect other readers are similarly sharp enough to gather that nothing in my post is recommending those speeds or claiming they are valid.

 

[Straightshooter1]

Went out this morning for the first time in weeks, as the heat here in Arizona has just been too hot to go out and shoot (like 110°F +). This morning is was below 90° with some temporary overcast. Ran some of my favorite short range loads and they were right were I like them to be:

 

[6MT]

say what??? I routinely get 3-5 SDs over 20 shot strings with a 308 WIN

Me too...

185gr Juggernaughts, D4064SSC (44.8gr), CCI BR2, Lapua cases

Very steady 1200m load

 

[Nature Boy]

Me too...

185gr Juggernaughts, D4064SSC (44.8gr), CCI BR2, Lapua cases

Very steady 1200m load

I looked through my chrono data and find some results similar to yours. This was with Lapua Win brass, which didn’t last long with these loads. When I switched to Palma brass I got more reloads per case, but found ES and SD numbers increased. My best load now has an SD of 11

 

[LGKLAS]

You can calculate this for yourself. And you should, really, because an FTR shooter at 1000y will have much more stringent requirements than someone shooting shorter range or bigger targets.

All you need to do is look at the difference in impact position due to velocity at the ranges of interest.

So let's say you're shooting 1000y and you need to keep a 200.20x Berger within the X ring. You're load is pushing it 2800-2820 fps.

At 2800, it drops 28.2 moa from 100y zero.
At 2820, it drops 27.7 moa from 100y zero.

Thus, you know that if you want to hold a 0.5 moa vertical, you need an ES no worse than 20 fps.

Or else, you will need to rely on "positive compensation" to give you a better waterline than your SD/ES would predict.


So run the numbers based on YOUR speed and YOUR need.

Exactly !!