BoltFitFinder

Spine 300 Easton 4MM FMJ vs Spine 340 Easton 4MM FMJ: specs compared

Updated 05 September 2026.

11.7 GPI
Spine 300 Easton 4MM FMJ wins on grains per inch

On grains per inch, Spine 300 Easton 4MM FMJ leads: 11.7 GPI versus 11 GPI.

SpecSpine 300 Easton 4MM FMJSpine 340 Easton 4MM FMJ
ModelEaston 4mm FMJEaston 4mm FMJ
BrandEastonEaston
Spine300340
Outside diameter.244 in OD.240 in OD
Weight11.7 GPI11.0 GPI
Grains per inch11.7 GPI11.0 GPI
Inside diameter.204 in.204 in
Stock nockEaston 4mm Microlite nockEaston 4mm Microlite nock
Stock insertEaston 8-32 aluminium half-out (50 gr)Easton 8-32 aluminium half-out (50 gr)
Point thread8-328-32
Straightness+/-.002 in (Match Grade +/-.001)+/-.002 in (Match Grade +/-.001)
Suitsa heavy draw of roughly 65 lb and upa medium draw of roughly 45 to 65 lb

Questions and answers

Which has the higher grains per inch, Spine 300 Easton 4MM FMJ or Spine 340 Easton 4MM FMJ?

On grains per inch, Spine 300 Easton 4MM FMJ leads: 11.7 GPI versus 11 GPI.

How do Spine 300 Easton 4MM FMJ and Spine 340 Easton 4MM FMJ compare?

On grains per inch, Spine 300 Easton 4MM FMJ leads: 11.7 GPI versus 11 GPI.

Compared here

Easton 4mm FMJ in a 300 spine: GPI, bore and nockEaston 4mm FMJ in a 340 spine: GPI, bore and nock