Please don't take this the wrong way...
Originally Posted by PURVIS6
i shot my tac at various ranges last week averaging 20-50 yards my consitency was marginal to say the least i am at a complete loss and throughly frustrated . i fall in the same catagorey as every one else some groups are excellent one day and some are marginal .
When you are seeing consistency problems, are you by chance shooting when there is a slight changing wind (or mild gusting wind)?
Keep in mind even bullets fired at 2,800 fps are effected by Wind (speed & direction), along with air temperature, humidity, and atmospheric pressure. Now take an arrow with lots of cross section area (unlike a small bullet) and flying at 400fps and you got the formula for near-hit, miss, and miss by a lot. If I remember correctly, a TAC-15 owner (perhaps it was Len Backus) reported his arrows hit high at higher elevations.