I did some more testing this morning with surprising results.At 93gr the second rifle shot a 1/2" five shot group but there were still indications of excessive pressure.A quick test over the chronograph showed why as the result was 3450fps.At 92gr two out of the six rounds showed very slight traces of excessive pressure and velocity was around 3410fps.I will be trying 91gr next time out(when more bullets arrive) and am expecting about 3350fps to 3370fps based on previous changes in the powder charge.It is amazing that this same rifle produces 3340fpswith 95gr of r-25 and 180gr ballistic points.A reduction of two grains still produced 100fps more velocity with the tsx's.With the other rifle a reduction of one grain produced a velocity increase of 60fps.It is amazing just how different two rifles can react to a change of bullet style.It looks as though one of the rifles will be using about three grains more powder but will also be producing 40fps to 50fps more than the other rifle.To add some insurance,I will also test both rifles in much warmer weather to be sure that no pressure signs are evident.