Say I'm shooting a 350 grain arrow @ 70# 30"draw (IBO). Will it still shot it's IBO speed 60#and 300 grain arrow?
Generally yes, another 3 fps slower at 50# when grained out (250 grain arrows)...so 6 fps slower than iboDoes this hold true from 60# going down to 50#?
OK, thanks. From what I've heard at least about my Experience, it is typically right on IBO or faster.Generally yes, another 3 fps slower at 50# when grained out (250 grain arrows)...so 6 fps slower than ibo
...but keep in mind that a lot of manufacturer's bows come in around 10 fps slower than they are rated to begin with, while some exceed their ratings. Tuning can also affect the speed of a bow quite a bit.
Not quite sure what you are missing here...you will lose approximately 2 fps per pound of draw weight that is drop so going from 70 to 60 should theoretically give you a 20 pound decrease. For the other part of the question, the bow should shoot it's IBO at 60 with a 300 grain arrow...theoretically. Also, don't forget to subtract for the peep and other additions to the bowstring...take away 1 fps per every 3 grains...approximately. Cheers!I don't remember the exact number that you lose but it does lose a little bit going from 70 down to 60
Has to be per pound...cannot even imagine going from 70 to 60 and only losing 2-3 fps with the same arrow...that would be phenomenal! Cheers!Elite Archery says to deduct 2-3 fps for 60# vs 70# Is that per pound? There's no way its only 2-3 fps from 60 to 70lbs
That is for determining speed at 5 grains per lb. You would lose 2-3 fps on a 60lb bow shooting a 300 grain arrow versus a 70lb bow shooting a 350 grain arrow at the same draw length.Elite Archery says to deduct 2-3 fps for 60# vs 70# Is that per pound? There's no way its only 2-3 fps from 60 to 70lbs
This is correct! Lighten the lbs you lighten the arrow also to get your IBO speedsNo they are talking if you are shooting a 5gr per pound arrow at 70 (350) vs a 5 gr per pound arrow at 60(250). The 60 # bow will be about 3fps slower even though it is shooting the same 5 gr per pound. The heavy draw weight is more efficient at overcoming friction and thus you see less speed loss. They don't mean 2-3 fps loss for 10 lbs. They mean 2-3 fps loss in IBO rating in a 60 lb bow vs 70.
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