Core-lokts and Interlocks are generally equivalent in many respects. Though I generally choose other bullets, I like the SP (flat based) Interlocks in certain cartridges and applications, while I like the RN Core-lokts in others.
On a most recent hunt, my partner had the shot when the moose we were teasing finally arrived in a huff. While I don't know how his second bullet strayed so far, it contacted both of the rear long leg bones above the 'heel', shattering both of them completely. Those big bones will often defeat a cup and core of any flavor after contacting one. The 175 SP Core-lokt he was shooting in his 7 Rem Mag broke both and left hardly a trace in the wounds. Quite probably it had also struck a woody stem before contacting either as well.
