1longbow

That’s a real historical bow. I used to visit Groves Archery when it was still making bows. I attended Univ of NM in the early 70s.

Unfortunately I cannot answer your question. However, I know the daughter wrote a book ( mostly a remembrance- with a lot of newspaper/ magazine clippings.)and I believe it is still available on Amazon. Which might give you more information or at least the historical background of the bow.

The legend of Harold Groves and the Spitfire bow by Sandra Burbridge

As I recall they were fast bows –

Cyberscout

You bet

Let us know how it shoots

cyberscout

PS

Easton spine chart for your bow weight and draw suggests a 2117, 2215 or 2020 aluminum shaft if you have any of those handy to try.

cybrrscout

I have similar weight ~ 55-56 lbs @ 29.25 ” draw with Groves 60″ Prestige Magnum ( with over draw) so i shot Bear Magnum 308’s with 110 gr Zwickey eskimo 2 bld on about 40 gr Broadhead adapter (150g total).  Since this arrow length and bow weight are the same you just need to get out the old Bear 1976 Catalog & find out what the spine of a 308 compares to…i’d guess it to be ~ 2016 / 2114.

Shooting at gar in 1980 and bowstring broke…cracked limb…it’s a beautiful wall hanger now.

I have similar weight ~ 55-56 lbs @ 29.25 ” draw with Groves 60″ Prestige Magnum ( with over draw) so i shot Bear Magnum 308’s with 110 gr Zwickey eskimo 2 bld on about 40 gr Broadhead adapter (150g total).  Since this arrow length and bow weight are the same you just need to get out the old Bear 1976 Catalog & find out what the spine of a 308 compares to…i’d guess it to be ~ 2016 / 2114.

Shooting at gar in 1980 and bowstring broke…cracked limb…it’s a beautiful wall hanger now.

forgot…the arrow length was 28″ with the 308