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I've always heard this too and had no reason to disbelieve it. Last year I got tired of working a PRB down the barrel of a particular rifle, so I switched over to a patch that was .008 less thick. It went down easy, like one had constant pressure on the rod easy. My accuracy went up exponentially. Instead of a 3-inch group that I had come to accept as the best this rifle could do, the holes were touching and could achieve a little over an inch accuracy, all things being equal but the patch.  This prompted me to look at another rifle that was not as hard to load but still was tough loading without fantastic accuracy. This time I used a ball that was .005 less than usual. Loaded easy, and accuracy increased quite a bit! So - don't be afraid to back off a tight fitting PRB combo and loosen it up a little. Worst case you can go back to tighter or go tighter.