RE: What grain/spine?
In my experience going a little underspined is better than going a little overspined. This is less obvious with a bow that' s more center shot than one that has significant paradox, but it' ll rarely hurt to do it as long as you don' t overdo it. Probably no more than 10 pounds underspined would be okay, especially if arrows precisely matched to the bow' s draw weight don' t seem to work especially well.
Center-shot bows are more forgiving over a wider range of spines than bows with significant paradox, that is the arrow is positioned off center. That' s why one can sometimes get over spined arrows to work in a center-shot bow. But underspined arrows will work in practically any bow as long as one doesn' t overdo it previously noted.
This all presumes that the bow is correctly tillered for the rested arrow position on the riser. If it isn' t, no spine will fly right. It also presumes, as previously noted, that the knocking point locator on the string is correctly positioned. Finally, it' s possible that one' s release style might make all of these assertions more or less moot.
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Whatever's wrong ain't the bow and whatever's right is the archer.
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