For what it's worth, I'm curious about these too, if only from a theoretical point of view. I'd be interested in hearing anyone's experience with these - I have asked about them elsewhere but the question got lost in the mix...
Judging by the range of data Hodgdon publish, it looks to be possible to duplicate the behaviour of a .243 firing 100gr (or 110gr) bullets using a .308 - though given the provenance of the .243 that's hardly surprising. What I thought was really interesting about the H4985 reduced loads is that they'll allow you to duplicate the ballistics of calibres like the .30-30 Win. and others, which we know from experience are perfectly good, light recoiling, deer rounds also. Put some 130gr RNSP heads on the front of a reduced load of H4895 and I bet not many people would tell the difference blindfolded. If they were stupid enough to fire a rifle blindfolded, which of course, they wouldn't be...
