I switched feildpoints going from a 100 gr. to a 125 gr. Out of curiosity, I put them throught the chrono......Well suprisingly (to me anyway) I lost 10 fps going to the 125 gr.........W/ the 100 gr. tip I was consistently getting 280 fps (375 gr. arrow) and w/ the 125 grain I was consistently getting 270 fps (400 gr. arrow) I was expecting to lose 5 fps or so but not 10 fps....I' m not really that concerned about the speed....280 and 270 is all the same to me but my concern is whether I' m dealing with a spine issue...i.e. the 125 gr. is creating much more ossilation due to weaker spine thus resulting in speed lose........Visually they fly perfectly (both arrows) and actually group together very nicely out to 35 yards and then the 400 gr. starts dropping a couple of inches.......I guess I' m just curious as to what you all think about the scenerio.......which ever one shoots best with BH is the one I' ll shoot so the weak spine issue could come into play.....10 fps seem like a big lose for only a 25 gr. increase in weight?

I will tell you one thing I do notice.[&:]

When you are trying to get some more speed out of a rig and drop arrow weight like 75 grns you gain about 5 fps

Then when you try to add a lttle weight, like 10 grns you loose 10 fps[]

Your speed loss is a little on the high side of the scale but within normal limits IMO.

RA,
LMAO......Archery' s anti-physics law, eh......

CG what bow are you shooting these days.I used to figure 5 grains =1 FPS.But on some newer bows that have stout force draw curves and store alot of energy 2-3 grains per FPS is not unusual.

CB

I have found that an arrow that is on the stiff side will usually shoot broadheads better than a weak spined arrow. But still shoot both because you never know till you try `em.

CB,
I' m shooting a PSE Avenger right now.....Nice bow but I' ve yet to pick up a bow as smooth as the Maverick w/ cps.....I really like the cam and 1/2 but hate the tec riser.....I think I' m going to hold out for next year and see who has the Cam & 1/2 offerings and if nothing impresses me, I' m going back to Darton.

CG
Have you looked at Reflex bows?
Their new line up have the Cam and 1/2.

Yeah, and I thought they were nice especially the Buckskin......They may be on the list for next year.....

CG, back to your original question....my first guess would be what you already suspected. Without knowing all the specs on your bow and arrow combination, I would guess that when you went to the 125 grain tip, you started pushing the envelope on your arrows spine.