Neck sizing should be o.k., until you reach the point that it takes real effort to close the bolt, then full length size.
Re hunting ammunition, full length size it, and then check it for feed and chambering. You would hate to loose a nice animal, because of a "sticky" cartirdge.
A heavier bullet will striker higher on the target, longer barrel time, with either a pistol or rifle, as I recall.
I shot National Match Course competition for years, and routinely f.l. sized all ammunition, with very few exceptions.
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