Navajo

Sometimes, even though you have your field tips paper tuned, you need to group tune. This group tuning converges the impact point of your field tips and your broadheads. Stand @ 20 yards and shoot your field tips, then your bh's. If your bh's are to the left, make micro adjustment to the rest(move to the right). Then shoot the same system again and move the rest accordingly. I prefer the walk back tuning method for field tips. I've found that it may not be a perfect bullethole thru paper, but it'll be very close!!

Talondale

You don't tune a broadhead, you tuna fish. (sorry just had to say it)

But spine definitely sounds like the problem.

Patriot15

Talondale, then why do thunderheads come with a paper that says how to tune the broadhead?

Talondale

Patriot15, the first line wasa joke.

The second line, spine, was my serious answer. Try what Tink said. He's been shooting bows longer than the two of us (I would say "have been alive" but I'm getting up there in age) and knows what he's talking about.

davidmil

Someone has to say it, inspite of what's been said, paper tuning is a great place to start. It is a valid method of getting your bow tuned to a point. Bare shaft testing is the method that's taken a hit the past few years. It was really more a method of tuning traditional equipment for finger shooters. There is no need to go through all that really. If your arrows are grouping with both broadheads and field points but impacting differently, it's only a matter of the smallest of adjustment to the GROUPS to get them hitting the same place. If the spine was that far wrong you wouldn't be grouping.OK to have a spine that's a littel stiff. Weak is a killer of groups. I just really question your weak spine grouping???? Try throwing on a lighter head and see what happens.