shaft question

[darb]

I have been shooting a 27" 2016 with a 145 out of my longbow which is 54# at my draw length.  

I wanted to move up to a 150 gr grizzly w/ a 100 adapter to increase my overall arrow weight.  This obviously makes the 2016's I was shooting to weak of a spine.  I was wondering whether anyone knew whether a 2018 should be stiff enough for 250 gr up front.

thanks in advance

[JRY309]

For aluminum arrows I like to stay in the 10-12% FOC for good arrow flight,and 250 grs. up front will put you way over that.Now for carbons they seem to handle higher FOC then other types of arrows.A 2018 with a 150 gr. head will put you close to 550 grs.JMO