I just switched from a Mathews Legacy at 64 lbs of pull to a Mathews Switchback that is currently at 67 lbs of pull...but I plan on moving it up to 70 lbs. I sighted it in with my Beman 400s, and then had my bowshop cut me a dozen more arrows.

While I was waiting for my arrows, I read the Beman arrow chart...and it indicated that I should shoot 340s...not 400s. The guy at the bowshop said that there was such a nominal difference in the two, he thought I'd be fine with the 400s.

What do you think?? Does it really not matter all that much..?

Thanks!