9-10 GPP for me. This puts my arrows 414-475. I don't think I've ever shot an arrow, in 46 years that weighed more than 550. My arrows are 27". Even with a 200 grain broadhead I didn't achieve an arrow heavier than 550 grains.
8-21 yard shots on 6 deer, all were pass-throughs the past 6 years. 16 yard shot on black bear, exit hole but arrow didn't pass through...he broke it falling within sight at 40 yards. Shot choice, impact location, and 2-blade single bevel sharp broadhead were more important than the arrow weight.