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Spine 340 Easton 5MM FMJ vs Spine 400 Easton 5MM FMJ: specs compared

Updated 05 September 2026.

11.3 GPI
Spine 340 Easton 5MM FMJ wins on grains per inch

On grains per inch, Spine 340 Easton 5MM FMJ leads: 11.3 GPI versus 10.2 GPI.

SpecSpine 340 Easton 5MM FMJSpine 400 Easton 5MM FMJ
ModelEaston 5mm FMJEaston 5mm FMJ
BrandEastonEaston
Spine340400
Outside diameter.269 in OD.263 in OD
Weight11.3 GPI10.2 GPI
Grains per inch11.3 GPI10.2 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 medium draw of roughly 45 to 65 lba medium draw of roughly 45 to 65 lb

Questions and answers

Which has the higher grains per inch, Spine 340 Easton 5MM FMJ or Spine 400 Easton 5MM FMJ?

On grains per inch, Spine 340 Easton 5MM FMJ leads: 11.3 GPI versus 10.2 GPI.

How do Spine 340 Easton 5MM FMJ and Spine 400 Easton 5MM FMJ compare?

On grains per inch, Spine 340 Easton 5MM FMJ leads: 11.3 GPI versus 10.2 GPI.

Compared here

Easton 5mm FMJ in a 340 spine: GPI, bore and nockEaston 5mm FMJ in a 400 spine: GPI, bore and nock