Thanks for the advice guys!
I decided to strip the fletching and do some bare shaft shots to get a better look into things. The 400's had ugly tears in all nock positions while the 300s were bullet holes once nocked tunned. So now even more confused however none the less will likely shoot the 300s due to the clean bare shaft through the paper. Is this a good or bad idea or should I go to a 350 spine and re-tune? thinking of fletching up some of the 300s tonight and see how they group with the bare shafts.
In regards to the penetration. Both the 300s and 400s are making it an inch or two through a new block target. So even if the 400's do have a slight penetration edge over the 300s, its not like the 300's are lacking penetration by any means
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