Anyone know what the difference in impact between the SST and ELD is. If the SST was dead center would the ELD impact higher or lower.
Hornady SST vs ELD Impact
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It will impact lower. IIRC, it runs about 80-100 fps slower in my 18" tube. How many inches lower depends strictly on your rifles muzzle velocities. When I return home, tonight, I can re-check the #'s I recorded on the two.If it's true that we are here to help others, then what exactly are the others here for?
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Fair enough. But consider this: Barrels are individual beasts. In the two I mentioned above, the POA / POI relationship has a direct correlation to the velocity. (Lucky me, I guess.)
Getting back to my original response to the OP, my 18" Larue shoots the factory SST's at 2519 fps. The Hornady Black (123 ELD) is running at 2485 fps, for a difference of 34 fps (less than I remembered).
For absolute drop @ 100 yards, the SST drops 2.83 inches, and the ELD drops 2.92 inches. A statistical draw.
In other words, a difference without any real distinction, at that distance. Could you shoot either at hunting distances interchangeably, with the same zero? Maybe.
For distance, the two compare as follows.
The 123 SST has a Litz G1 BC of .462, whereas the 123 ELD has a Doppler confirmed G1 BC of .506. With a sight height of 2.5", and the rifles both zeroed @ 100, here is the expected performance from my 18" tube.
fps lb / ft Drop (in) Range SST ELD SST ELD SST ELD 0 2519 2483 1733 1684 -2.5 -2.5 100 2331 2313 1484 1461 -0.17 -0.17 200 2151 2149 1264 1262 -4.26 -4.35 300 1980 1992 1071 1084 -15.88 -16.08 400 1817 1843 902 928 -36.39 -36.58 500 1664 1701 756 790 -67.46 -67.33
Out to 300 yards, both bullets are within 50 lb /ft of energy and 50 fps.
Beyond 300, the ELD retains more velocity and energy, but those aren't the numbers the OP is interested in. The real tale is in the drop. Note that out to 500, the two are never more than 1/4" apart!
Bearing in mind, these numbers are for this particular rifle and these two specific factory loads.
Arkhangel5 mentions his barrel shooting the two at 3/4 moa apart (~.75" at 100 yards), but has no MV to compare. This could easily be an effect of barrel harmonics, as Jason suggests. If so, then simply zeroing your rifle for the ammunition you intend to shoot will address any POA/POI issues, and life continues to be good!
In either case, I would consider the 123 SST and Black 123 ELD to be ballistically compatible to a relatively high degree.
In other words: "Go shoot the things and have a good time doing it!"If it's true that we are here to help others, then what exactly are the others here for?
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Originally posted by Sticks View PostLooks good on paper, but reality sucks.
So, which part of the above sucks?If it's true that we are here to help others, then what exactly are the others here for?
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Originally posted by NugginFutz View PostPerhaps your reality differs from my personal, first hand reality. Those are no kidding, fired from my own rifle, numbers using verified ballistic coefficients from respectable sources. I've confirmed the drops for myself, using the same ballistic engine used for the above table, with actual shots on targets at different ranges out to 750 yards.
So, which part of the above sucks?Sticks
Catchy sig line here.
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Originally posted by Sticks View PostIf you've confirmed your drops with both rounds, then the dope chart is valid. One must confirm longer range drops/POI to validate the dope chart. Your rifle/barrel has to like the round you are shooting as well. My reality is that a magneto speed MV and a solid 100 yard zero was off paper at 700y.If it's true that we are here to help others, then what exactly are the others here for?
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Here's a link for the kind of information you're looking for.
This will allow you to select various known projectiles and plug in all the variables you may need.
To answer your question, though, it's really a matter of the height of your scope over the bore and at what distance the rifle is zeroed. If yours is 2.5", and zeroed at 100 yards, the bullet will be ascending from 2.5" below the scope at the muzzle to the 100 yard zero. At the previously mentioned 2584 fps, the bullet would have risen to about 2" below point of aim at 10 yards.
Just as a matter of interest, but why 10 yards?If it's true that we are here to help others, then what exactly are the others here for?
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