Greetings:
I have the Carbon Express 390 Pile Driver. With cams advanced I shot the 370 grain arrow point combination
at 411 feet per second. I have since added and extra layer of serving .030 BCY over the arrow nock area to
save the original serving as it is too costly to keep importing from the U.S. into Canada.
Adding the serving slowed the bow down a wee bit plus I backed the cams off slightly to reduce stress.
Here are some arrow weights and speeds I shot today for you to see.
1)Barnett head Hunter 378 grain including point at 393 feet per second.
2)Barnett head Hunter 402 grain including point at 382 feet per second.
3)Carbon Express Pile Driver 450 grain including point at 367 feet per second.
Over all I am very happy the ways this crossbow shoots.
Thanks for inquiring.
Take care.