| The reason for there being two spines is the weight on your fingers; it falls right on the boundary of two spines. This combined with it's better to have too stiff an arrow rather than a weaker one, I would go for the 430 with a heavier point weight than standard.
A 480 covers the range 41-45lbs, with you pulling 45lbs-ish this arrow is at the weaker end of its range, acceptable if you don't increase your drawlength any more or you don't want to increase your poundage for whatever reason.
With the 430 covering the 46-50lbs range this makes the arrow on the stiffer side but it does allow you to play around with point weights/ bow poundage and allows for increased drawlength (I'm not sure how long you have been shooting and therefore whether this is something you may find yourself doing if you are quite new to the sport, it can happen)
10 grains, I don't think, will move you very far in the spine range at all.
You will have no trouble at all hitting the 100yds with these arrows, I bet the sight mark won't move much at all.
This is only my own opinion and the way I would do it, others may have a different approach or advice, but I hope it helps.  |