Okay I need help!

Went to the range today and the 174's did not shoot that well. The guns shoots 150's so well it is unbelievable but I now need it to shoot Match King 174's.

I used 36gr of CR17 which is virtually identical to 3031 with a OAL of 3.045 inches.

At close range pretty good, not happy at all at 300 yards where I want it to be very good.

So if someone on this forum has had accuracy using Match King 174 please tell me what powder you used, how much and the OAL you used.

Any suggestions would be appreciated as I am now determined to get this gun accurate at 300 yards and beyond, I know it is possible.

Thanks