I shoot Victory RIP XV's, they are not as durable as a thicker walled arrow, but acceptable to me. I can shoot them into 5/8 plywood and not hurt them, but a glancing blow off a tree limb breaks them in half (does not matter which company that makes them thin walled arrows are not as strong). My wife shoot GT Ultralights and they are about the same durability. RIP XV 500 spine weight 5.0g/inch. 400 spine 5.6g/inch, 350 6.4g/inch, 300 7.0g/inch. My draw is 30 1/2" and I shoot 3D with the 350 spine and Tophat glue in 130g points at 51 pounds for a FOC of 17% at 31" and ASA speed of 288fps. For hunting I shoot them at 29" and 56 pounds with the Tophat 50 grain Stainless insert (they fit flush with shaft) and 125g Hellrazor COC fixed 3 blade and a 3" feather at 20% FOC, total weight of 390g. and 280fps. Since I am 65 years old and no longer want to shoot high poundage, I feel that a small diameter arrow with a fixed blade coc broad head and 20% FOC will give me the best penetration. I also can use the same shaft for 3D and hunting. I arrived at the proper poundage by shooting bare shaft thru paper while changing poundage on bow in 1 pound increments .