I'm careful to call BS on someone's claim to extreme accuracy. I know that modern rifles and handloading can make a HUGE difference in accuracy.

I've not seen that type of accuracy from larger calibers like 7mm-08 or 338-06 however I've never loaded for those calibers either. I've loaded for several larger calibers30-06, 7mm mag, 280, etc etc. but have not been able to attain that type of accuracy. I've been able to make those calibers touch holes at 100 yrds, but that's a far cry from being inside 1/2" at 200. To be inside 1/2" at 200 you pretty much gotta put them all in the same hole at 100.

But I can't say that this particular individual is full of it. He may actually have done it.

That being said I would love to see that type of accuracy in person, rather than over the internet