If he goes lighter, he'll get less penetration.

 

He shouldn't go lighter , he should go heavier !

 

Why do people assume he is hunting with it?
With that said, Easton Flat Line or Hexx.

 

Yes he will probably will not hunt with it he just likes the changable heads. And thanks

 

What recurve is he shooting? The best advice I ever received was to order a 3 rivers wood spine test kit. I hunt occasionally with a 45# Bear Grizzly. That bow shot ok with the average 500 spine carbon, but the wood test kit really allowed me to find what it liked. It ended up shooting best with a 55-60 wood spine. I have used them ever since. I would advise your brother not to chase speed with a recurve, but to chase what seems to fly best. Order a test kit and go from there. Also, read some informative posts on tuning nock height and brace height to tune his bow.

 

He is shooting a martin panther at like a 27" inch draw so he's getting a bit less then 40lb.

 

I would start at around 500 grain hunting arrow for a 40 pound recurve. Lite arrows are for target/3d, not hunting.

Beman heritage 600 with brass insert and a vpa two blade.

 

I shoot a 40 lb recurve at about 27.5" DL. I use full length, 600's with 175 grain points. They fly great, with bullet holes in paper.

I'd look for an aluminum arrow with a spine of around 700, and go from there.

 

I've shot Lots of recurves & did carbons for 2 years & went back to aluminums. Several sizes could be used. Example, I use 1913s for target, field & #2216s hunting out of the same weight bow. I do the 1913s for target, field because I need distances out to 80 yds & can't get that with the heavy shaft..
Anyway, if using a release he can use 1913s. 1916s OR back in my old days I used 1614s out of 40#. If he's using fingers a thicker wall like 1918s or a 2016, 2018..
Those will give you the "lighter" arrow he is looking for. Personally, IF ONLY TARGET SHOOTING, I would go with a 1916 Aluminum. Won't bend easy like a 13s..
I am assuming he hits the target most of the time.. Lots of Carbon shooters will chime in & I can't help you there.

 

Yeah I told him he needs some aluminums but he insists on carbon.

 

If he is drawing the full 28" or more I would say 600 spine carbon left closer to full length. In aluminum something similar or a slightly higher spine. Lots of variables in a trad bow. What his riser is cut to, material for the side plate, actual draw length, how good his release is. Two people with the same 40# recurve could be shooting two different arrows.

 

Easton Carbon Aftermaths 500's

These!
For sale.
50- tyd.

 

These!

For sale.

50- tyd.

What are they

 

Don't go too much lighter! Most recurves and trad bow like 8-9 gr/lbs too much lighter and you risk damaging the limbs. Ask your bro to look at the literature that came with the bow, I bet there is a minimum recommended arrow wt listed in there.

That being said GT Hunters in 3555 are at 7.4 gr/in, I've shot these a ton in my trad bows and they are a fine arrow for the money, exp if yo buy some "blemished" arrows.

Finally, as Aaron said above, there are a lot of additional parameters which are needed to help make a decision.