Today I was working up the load for my Sako M85 .375 H&H, armed with a chrono.
I was using:
250 gn Barnes TTSX
IMR 4350 ranging from 74 gn to 76.5 gn by 1/2 gn increment
Norma brass
Federal Premium Match Large Magnum Rifle primers
COL 3.555"
I was able to get sub 1" MOA w/ 74.5 gn and 75.5 gn loads. However my chrono readings were only ranging from 2075~2157 whereas the factory load data shows expected velocity between 2422~2604 using 71 gn to 79 gn. Another odd thing was that at 76 and 76.5 gn the velocity readings actually dropped to 1700~1885 which seemed illogical.
Perhaps it's time to get a new chrono but could there be any other explanation?
Regards,
