The other thing that seems to happen is that not every double shot with the said problem bullets suffers from OSR.

After all, think how many doubles are out there, think how many MAY have shot some of the bullets through them and then how many OSR Doubles can we pin down - not that many.

So firing the problem bullets though a double isn't always going to cause OSR but as 470Evans said well

"Is that "proof" the monos caused it ? No, but it's good enough for this DR owner not to fool around with monos."