"I do have some of those dinky shrink wrap arrow wraps, @ 13gr each, so I may put one of those on each of the 6 from set C,"
note: I tried one of those shrink wraps and I'm not impressed, it looks like Nora Batty's stockings.
I know I can get different weighted inserts online, but I'm thinking a couple of small washers, of the right dimensions, will do the job of raising the overall weight and FOC of the arrows.
Bookmarks