Most of them will be, yes. The aim when zeroing a rifle how you want (or testing loads) is to take the shooter out of it as much as possible. You want to see how that particular rifle with that particular ammo shoots.
You can't tell bugger all if you along and offhand shoot for example, because your point of impact will change every single shot, and there could be a thousand reasons why.
In saying that, I have found my ammo of choice (factory, I don't reload) so when I go to the range now I normally shoot off my bipod only, as that's what I need to practice. Need to practice offhand at some stage too but it seems to be frowned upon at ranges haha.
Hope that answers your question.
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