Meanings of relentless accuracy in English

But the main problem is his relentless accuracy.

But the guns of the American ships, straining in pursuit, answered steadily, carefully, with relentless accuracy, with cruel persistence.

Nature was the same strict accountant then that she is now, and balanced her debit and credit columns with the same relentless accuracy.

With relentless accuracy the arms of the gigantic tongs with which Nogi threatened to surround the entire Army of the North began to close.

I say, quite honestly, that I had rather have the old system of classics pure and simple, taught with relentless accuracy, than the present hotchpotch.