thats as low as i would go! 450 grs. i reckon all your arrows have the front insert glued in ? if not and you have some you haven't put together yet. you can do the awshucks instant weight gain trick. install 1/2" to 1" 8/32 set screws inrear of insert and glue it. 1/2" is 12 grs 3/4" should weigh 18 grs and 1" 24 grs which would be 474! plus maybe 1 gr glue wt. 475