BoltFitFinder

Spine 300 Easton 5MM FMJ vs Spine 500 Easton 5MM FMJ: specs compared

Updated 05 September 2026.

12 GPI
Spine 300 Easton 5MM FMJ wins on grains per inch

On grains per inch, Spine 300 Easton 5MM FMJ leads: 12 GPI versus 9.1 GPI.

SpecSpine 300 Easton 5MM FMJSpine 500 Easton 5MM FMJ
ModelEaston 5mm FMJEaston 5mm FMJ
BrandEastonEaston
Spine300500
Outside diameter.273 in OD.256 in OD
Weight12 GPI9.1 GPI
Grains per inch12 GPI9.1 GPI
Inside diameter.204 in.204 in
Stock nock5mm X nock (9 gr)5mm X nock (9 gr)
Stock insert5mm HIT insert (16 gr)5mm HIT insert (16 gr)
Point thread8-328-32
Straightness+/-.001 in+/-.001 in
Suitsa heavy draw of roughly 65 lb and upa lighter draw of roughly 25 to 45 lb

Questions and answers

Which has the higher grains per inch, Spine 300 Easton 5MM FMJ or Spine 500 Easton 5MM FMJ?

On grains per inch, Spine 300 Easton 5MM FMJ leads: 12 GPI versus 9.1 GPI.

How do Spine 300 Easton 5MM FMJ and Spine 500 Easton 5MM FMJ compare?

On grains per inch, Spine 300 Easton 5MM FMJ leads: 12 GPI versus 9.1 GPI.

Compared here

Easton 5mm FMJ in a 300 spine: GPI, bore and nockEaston 5mm FMJ in a 500 spine: GPI, bore and nock