I have used 49.5 gr. 4064 in my .270 too. It's a good load and chronographs about the same speed as 60 gr. H4831, in my gun.
I am not and don't intend to be critical, so....
I used 49 grs 4064 TILL I found JOC's load. After getting my chrono I found these results to be pretty consistent.
49-4064 / 130 / 22" = 2900 fps.
62-4831 (MS) / 130 / 22" 3100 fps.
HOWEVER, HOWEVER - when MS ran out the NEWER H4831 did NOT equal the MS. Vels were @ +/- 3000. I quit H 4831 altogether when I found 7828.
NOW TO BE FAIR H changed their newer 4831 at least twice that I did NOT know about. JB (MD) says that now the newer H 4831 is performing pretty well. I would accept that sight unseen.
