I want to see if someone can help me a bit.
Over the years I've used a couple different arrows, all basically the same spine and weight shooting 100 gr broadheads, from a 62# single cam compound at 28" draw. I still have a hand full of ACC 390 and Beman 400 that shoot identical. They are virtually the same spine and weight, at least close enough that they shoot the same for my ability. Anyway, I wanted to play around with a broadhead that is big, wide, and heavy (165gr landshark). The first time I shot them they went way right. At 20 yds the ACCs hit about 10-12" right and the Bemans about 8-10". Yikes! The difference probably due to the fact that the ACCs are a composite so they behaved slightly different. Anyway, I first thought this big head was plaining, but they were grouping, so I realized that this heavy head was affecting the spine, giving me too weak a spine.
My general question is, what spine should I try now...340 or maybe even 300? I don't want to waste money on arrows that won't work.
Thanks.