I'm not an expert on barrows but on my old account i was going in barrows with combat level 70 and just killing other monsters instead of the brothers-its easier but u dont get as good rewards.I got like 100+ kills and i only got karils bow
Inventory melee:Dragon battleaxe(or rune/dragon hally or dds)Anti dragon shield,anti fire potions,prayer potions(prayer 43 if ur gonna use it)and lobbies or swordies if u cant afford that then use cakes instead. when u get ur range higher.Inventory range:mage/crystal bow,mith-rune arrows,lots of prayer pots,lobbies/swordies/cakes.and there is a crease in the wall just before u go near the baby blues where u can hally the drags from u may be able to range from there aswell.
if u need to get ur combat up but dont like it when it takes ages-eg when ur killing something with loads of hitpoints,then go east of lumbridge castle,get training sword and shield then kill the tiny spiders that are level one(not giant spiders) then u should go do the chicken thing.Either that or keep cutting normal logs until u r level 20 then cut oak logs and sell in general store.or another way is to become a member and pickpocket men.
oh yeah i forgot.I've done: Cook's assistant,Demon Slayer,Romeo and Juliet,Rune mysteries,Sheep Shearer,Shield of Arrav,Restless ghost,Lost City,Priest in peril and the fremmenik trials. Ive only got 20 qp lol