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Depends on your rifle I load them with 27.0 grains gives good accuracy at 100 a friend loads them with 35.0 grains
I haven't done any expansion tests with them but the lead is as soft as I can get...

The 170gr won't expand at 1000fps need to be 1500fps+ they are the same lead mix as the 151HP ok for head shots but then any bullet will do for that

If it is a used match barrel it could have a 14" twist quite common in the days of the old 144 gr FMJ Australian ammo and projects,
that could explain the unstable 200 grain the Greenhill formula...