cbanman,
Dude I' m not one to down a guy' s new toys.........but yeeeeeeeeeeikes.[]
Did you read the directions on that chrono of yours?
(Your original Numbers.....)
28/70/400gr/286fps
28/70/374gr/291fps
28/70/345gr/292fps

Does it make sense in your mind that you only lost 1..........1fps for a weight gain of 29grs from an arrow of 345grs to 374grs?
Even I can do the math on that puppy and thats 1fps/29grs of arrow weight. In a vaccum or on the moon maybe but not here thats for sure.

And the next jump is almost as bad, but doesn' t match the pattern of the first arrow switch...........this one shows a velocity loss of only 5fps for a gain of 26grs in arrow weight . That' s a ratio of 1fps/5.2grs of arrow weight. A little closer to reality but still off the chart for any bow I' ve ever owned.
Usually a ratio of 1fps for every 2 to 3.5grs of arrow weight is normal.

Something is WAY out of whack....and it' s gotta be the chrono or your grain scale but those numbers are unrealistic. Sorry.


OK.......now you edited those original numbers.........I assume still playing? But now you have a reading there where you actually have velocity INCREASING 5fps when you RAISED arrow weight 21grs!?...Ahhhhhhhhhhh You' re killin me here![]
(your NEW numbers)
28 / 70 / 425 / 270 / 68.8 /Plastic vanes
28 / 70 / 395 / 286 / 71.8 /Feathers
28 / 70 / 374 / 281 / 65.6 /Plastic vanes
28 / 70 / 345 / 292 / 65.3 /Feathers

What are you doing to that poor chrono?....and what happened to the 400gr arrow? You aren' t drinking and shooting are you.........if so put down the can and step slowly away from the chronograph.