Norma Ecostrike 150g .308 almost 6 inch drop from 100m zero to 200m target.

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Syncerus Caffer

Syncerus Caffer

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In summary, I zeroed my sub two hundred round .308 M12 on a range at 250ft above sea level with a headwind of 7mph constant and atmospheric pressure of 1003Hpa and OAT 17c.

Zeroed the Norma Ecostrikes in .308 150g at 100m with a sub MOA group one inch above the bullseye from a bench with a flat / horizontal gradient between the rifle height and the paper. Then transfered to a 200m distance running parallel with a similar rifle height from bench to target setup. The drop between 100m (an inch high) to 200m was almost 6 inches.

Has anyone else witnessed such a significant versus publicised drop on their Norma Ecostrikes? I have always used Norma (lead or unleaded) due to their quality and accuracy. The nickel coated copper round certainly does leave the barrel in a cleaner state but almost half a foot drop seems quite a lot. Grateful for any constructive thoughts or similar experiences.
 
They would have to be leaving the muzzle at 2350fps. I would assume that the drop difference was due to operator/equipment error unless you are using a silly short barrel
 
I know nothing of the Ecostrike but I recently chronographed a friends 6.5x55 Norma 120g BT factory ammo at 2605 FPS rather than the 2850fps on the box! Fox shot may not be too far off!!
 
Utectok said:
Mine drop 12cm from 100m zero to 200m that sets off about 2675fps bc 0.415 I think
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Without looking it up that sounds an extremely high ballistic coefficient for a 150 gr round in .30. I would have expected something nearer 0.315 than 0.415 even with a semi-boattail.
I take that back; I have looked it up and it says 0.42. My apologies for doubting you !
 
Oldstalker said:
Without looking it up that sounds an extremely high ballistic coefficient for a 150 gr round in .30. I would have expected something nearer 0.315 than 0.415 even with a semi-boattail.
I take that back; I have looked it up and it says 0.42. My apologies for doubting you !
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Sorry for confusion I don’t shoot the Norma loads that’s my home load and interbond just saying 6” drop is fairly ok
 
Syncerus Caffer said:
In summary, I zeroed my sub two hundred round .308 M12 on a range at 250ft above sea level with a headwind of 7mph constant and atmospheric pressure of 1003Hpa and OAT 17c.

Zeroed the Norma Ecostrikes in .308 150g at 100m with a sub MOA group one inch above the bullseye from a bench with a flat / horizontal gradient between the rifle height and the paper. Then transfered to a 200m distance running parallel with a similar rifle height from bench to target setup. The drop between 100m (an inch high) to 200m was almost 6 inches.

Has anyone else witnessed such a significant versus publicised drop on their Norma Ecostrikes? I have always used Norma (lead or unleaded) due to their quality and accuracy. The nickel coated copper round certainly does leave the barrel in a cleaner state but almost half a foot drop seems quite a lot. Grateful for any constructive thoughts or similar experiences.
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It is what it is.
Have you chronographed them?
 
Drop is the 2nd column from the left and is shown in centimetres.
 

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Real world velocities never seem to be up where the box says they are, and generally they test in barrels which are way longer than sporting rifle barrels.

I've seen 308 ammo with "yeah it will be 2900ft/s" on the box and then in very small print underneath is written "test performed with a 32" target barrel". So when you move over to your 22" barrel sporter you're going to be a fair bit slower, maybe even as much as 4-500ft/s.

And if you're chucking them down range at around 2500ft/s a 6" drop from 1-200y is probably not a million miles out.
 
Syncerus Caffer said:
In summary, I zeroed my sub two hundred round .308 M12 on a range at 250ft above sea level with a headwind of 7mph constant and atmospheric pressure of 1003Hpa and OAT 17c.

Zeroed the Norma Ecostrikes in .308 150g at 100m with a sub MOA group one inch above the bullseye from a bench with a flat / horizontal gradient between the rifle height and the paper. Then transfered to a 200m distance running parallel with a similar rifle height from bench to target setup. The drop between 100m (an inch high) to 200m was almost 6 inches.

Has anyone else witnessed such a significant versus publicised drop on their Norma Ecostrikes? I have always used Norma (lead or unleaded) due to their quality and accuracy. The nickel coated copper round certainly does leave the barrel in a cleaner state but almost half a foot drop seems quite a lot. Grateful for any constructive thoughts or similar experiences.
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zerod at 100 the 6" drop sounds about right, but 1" high at 100 and 6" low at 200 sounds a lot. but as Namman said, is what it is.... cant do a lot other than change ammo or zero it higher at 100.

sure its 1" high at 100?
 
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I have chrono’d my 223, .243 and 270 and all are +/- 10% slower than what the box says.
So take the box figures with a pinch of salt.
200m drop in my .243 for example is about 9cm so just 3-1/2”.
 
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Firstly, thank you to all the responses, suggestions, thoughts and private messages on this matter.

No I hadn't choreographed. Yes, and to the point raised by several, the rifle has a 22.5 inch barrel (I was using a moderator in addition) which on reflection is part of the factor. I wasn't expecting an exact carbon copy of the trajectory on the box but note that I will ascertain what testbed (barrel length etc.) Norma has used. Discussing the matter further and again to the comments in the above thread it would appear that ammunition manufacturers do not all typically use hunting rifle barrel lengths when testing. That may sound obvious but equally surprising that as hunting rounds there isn't a more standardised testing methodoly or means of reporting comparatively performance to a hunting rig. I have learnt my lesson. Thank you.
 
It’s the VW emissions story - they’re all in competition to sell, and one of the things that sells bullets is speed. Historically they got away with it because no one had chronographs, and seldom shot far enough for it to matter.

Now they get away with it because the people who shoot far enough for it to matter do have access to chronos and make the appropriate adjustments, while everyone else... still generally don’t shoot far enough for it to matter!
 
Syncerus Caffer said:
Firstly, thank you to all the responses, suggestions, thoughts and private messages on this matter.

No I hadn't choreographed. Yes, and to the point raised by several, the rifle has a 22.5 inch barrel (I was using a moderator in addition) which on reflection is part of the factor. I wasn't expecting an exact carbon copy of the trajectory on the box but note that I will ascertain what testbed (barrel length etc.) Norma has used. Discussing the matter further and again to the comments in the above thread it would appear that ammunition manufacturers do not all typically use hunting rifle barrel lengths when testing. That may sound obvious but equally surprising that as hunting rounds there isn't a more standardised testing methodoly or means of reporting comparatively performance to a hunting rig. I have learnt my lesson. Thank you.
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I know of several stalkers who have had this issue when dialling in ranges on their turrets. Indeed they have all been shocked when they have used a chronograph.
Its not just Norma !
 
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