how big you think this spur is...

[THattaway]

Those in the op don't look to have a lot of curve. I know for sure how long these were. 

[highcj5]

1 3/8

[beagler]

1 3/8

[flintlock]

 1 3/8 or so.  Awesome and I hope you get him.

Wess

[Rio Fan]

I'll go with 1 1/2.  I hope you get to drop the hammer on that bird, Shannon.

[El Pavo Grande]

I'd say between 1 3/8" & 1 1/2"

[rem 300]

Long enough

[DirtNap647]

1 1/2

[Flydown]

Being that close I would have to say as long as their ever gonna get.    1 5/8

[surehuntsalot]

I'm going with 1-1/2

[appalachianstruttstopper]

1.5

[Gobble!]

1 3/8 to 1 1/2

[30_06]

150"......wait that's my deer answer. Uhh 2"....yup 2"

[alclark2]

1 5/8 

[hs strut]

perfect size to get his head hammered