Yes, as zeropak says, really depends on the rifle. Should the rifle be capable of better? If it's an old BSA or something then 1MOA is great, quit whilst you're ahead and go hunting. If you've got a new Sako and really want to extract the most out of it...
A mate of mine reliably gets cloverleaf groups with the 165 SST but has struggled recently with the 150's. They aren't the most consistent bullets so the accuracy potential might be a bit limited. I suggest backing them away from the rifling a lot more, giving them maybe 50 or 60 thou jump and seeing how that compares. The thinking here is:
A) They are not a VLD style bullet that should need to be snug against the rifling.
B) If they are a bit inconsistent, giving a lot more jump means they'll all end up with a good amount. Up close, some might end up with very little, and others might have twice as much and that's asking for flyers.
1gr steps are also really broad and you might have skipped over a point where the load might shoot a lot better. If you have access to a chrono, there are some tricks you can use to try and shortcut the process and cut down on the components used.
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