The facts: The ELDX is not working up close but it works at distance, so despite what the manufacturer says it is going too fast when close. Going to another soft projectile will likely just fuck the carcase and turn a whole side black and no one wants that. Accubonds will give penetration and expansion and handle the high velocity. So will the partitions that others have mentioned.
My guess as to what is happening based on similar problems in a different but also fast calibre, is that you have a partial surface blow-up at close range which dissipates the bullet energy outwards causing a shallow flesh wound and then pencil penetration of the core base.
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