spine question

[SkottyBoy]

I have been shooting mfx classics 500s.  Expensive. Recently bought a couple dozen gold tip blems from sponsor here and wondering can I go with same length of arrow if the setup is the same.

[OS]

What size shafts did you pick up 55-75   75-90 ??

[fz4vgq]

According to Stu's calculator MFX Classic 500's and GT 35/55's are nearly identical in spine. Your mileage may vary though.

[fz4vgq]

Also.... With the GT's you are able to add weight to the front end of the arrow with their screw in weight system even after the arrow is built.

[JRY309]

Even though they are very close in spine,they are different diameters.You should still bareshaft tune at full length and trim and tune from there.

[elknutz]

Don't cut without testing.  And beware the calculator. Its sometimes right on, and sometimes misses by a mile.

[SkottyBoy]

Thanks for the input.  Looks like I will start over.  Good thing shooting is fun!