Troy, what was the MV of your 7mm RM ELD-X load, and what the approx ranges were for the ELD-X kills you weren't happy about? And can you remember what the ranges were for the Sierra and Hornady kills subsequently? And were you getting exit wounds with the ELD-X?
Thing is, the ELD-X is basically a traditional jacketed lead bullet, but with a hollow point and plastic tip. There's no rocket science to the design. If you were to cut one in half and compare to the Sierra spitzer (I assume GameKing 1913) I wonder if the jacket thickness is much different? Possible explanation is that in 7mm the ELD-X jacket can't deal with the impact velocity of the 7mm Rem Mag? Bullet blow up has been reported at close range with magnums. Just not sure if you're at close range or more like 300m+?
I've not used ELD-X in a Rem Mag, but I have used the 150gr ELD-X in a 7mm08 and that hammered the fat 2 yr old spiker I shot with it. Absolutely flattened him, at about 150m. Impact velocity would have been around 2500fps at a guess.
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