The Knight Rifles have a Green Mountain Barrel which is one of the best barrels out there for the money. If your manual says the rifle is able to fire such a load then I am sure it has been tested to those extremes. Be sure and read the manual and make sure they do not list pellets only with those kind of loads.

Most people claim if your barrel is not at least 26 inches it will not be able to burn the full 150 grains of power off before blowing it out the barrel. My Wolverine has a 22" barrel and there is no way it would or could shoot that much powder, also I would not want to.

Your choice of a projectile will be very important if your going to attempt this. I would look into the Barnes Expanders or the Thompson Center Shockwaves. Some others are the Knight Red Hots (made by Barnes) or Hornady SST's (which are a shockwave). Your accuracy might not be the best with 150 grains. Also if you have a scope on the rifle watch out for the recoil.

Personally, I would not waste my time, money and powder. Also the recoil will be really stiff. You might be better off like Mark said. Start at around 80 grains and work you way up until the groups get too spread out. Then back up to where you had the best group. That would be the rifle sweet load.

You really do not need to shoot 150 grains of powder to kill deer. They have been shooting them for over a hundred years with 70 grains and a roundball. The extra powder and better projectile design will extend your overall range of shooting and harvesting but you will need to learn your rifle and practice out to the distances you intend to shoot.

I was looking at that rifle of yours when they were on sale. If I would have had a use for the rifle I would have jumped on it. It sure looked like a good deal. Good luck with your rifle.....