My GT3555s with a 225 gr field point are just a little over spined for my 48# longbow. I shoot off the knuckle and I'm thinking about going to the GT1535s. What other arrow brands have the same spine including aluminum?

1916 aluminum is close to 15/35 which are .600 spine

Several options available, each manufacturer has spine charts available on their respective websites. That being said, 3Rivers has a chart for each shaft/arrow that they offer listed under the individual products as you click on them. Keeps you from having to bounce all over the web initially and if you get it narrowed down to 1 or 2, you can then do more research.

Thanks, I appreciate the advice.

You may need something weaker than a 600 spine shaft if you are shooting off your knuckle and the bow doesn't have any shelf at all.

Have you tried that arrow full length?

QuoteOriginally posted by JamesKerr:
You may need something weaker than a 600 spine shaft if you are shooting off your knuckle and the bow doesn't have any shelf at all.

I am thinking the same thing. Right now I just want to experiment with 1 or 2 arrows before I buy a doz. I'll check some local sporting goods stores....Thanks again