Bareshaft Headache!

[BWallace10327]

I shoot a black widow pma 62" recurve, right handed.  55@29, I draw 29...sometimes a touch mreif i'm not careful.  Anyways...I get bareshaft flight with this bow like nothing I have ever seen.  30"  Carbon Express Heritage 250, regardless of point weight or brace height or string (so far), arrow kicks HARD nock left and impacts about 8" low and 10-12" right.  It doesn't matter if the point weight is 250 or 125 or anywhere between.  I grouped 3 bareshaft arrows as 15 yards in a 3" pattern off target (low right) 1 with 250 grain point, 1 with 175 grain point, 1 125 grain point.  The flight for each was identical.  Replicated the trend with brace height from 8 1/4-8 3/4.  I built a 14 strand d97 instead of the 16 I've been shooting...no change.  Suggestions?  I am at a total loss. 

[McDave]

What is the spine of a Carbon Express Heritage 250?

[BWallace10327]

Its something odd, like a .390  . 

[McDave]

The usual cause of the results you describe would be a too stiff arrow, which would normally give you a nock-right, but instead impacts the riser and bounces back left.  This would explain why you get the same results no matter what the point weight is: because it is the result of the bounce rather than the paradox.  However, I would normally use a .400 spine bare shaft cut to 29” with a 55# bow, and a .390 spine bare shaft cut to 30” should be close enough that it should paradox rather than bounce.  The PMA is cut past center, which should allow a considerable latitude of spine difference.  However, just to eliminate the possibility that the arrow could be bouncing off the strike plate, you might want to try a .500 spine bare shaft and see what happens.

[the rifleman]

I ran into a weird situation w heritage 75s.  At my nock height tuned for any other arrow the heritages would fly nock low, bounce off the shelf and give me odd results.  I had to raise the nock height up quite a bit to get them flying correctly.  It always puzzled me...

[sveltri]

It looks to me like that arrow is under spined, have you tried a 350?