Powders vary according to type. They also vary according to grade. You will find most people shoot FFg or FFFg grade. Many people shoot FFFg in .50 caliber rifles and under. FFg grade are shot in .50 caliber and bigger although many of the larger calibers will shoot FFFg. Remember that FFFg is 15% stronger then FFg grade powder.

Pyrodex P (Pistol grade or FFFg grade) is 15% stronger then Pyrodex RS (Rifle Shotgun or FFg grade) Triple Se7en FFg grade powder is 15% stronger then Pyrodex RS. You also have American Pioneer Powder FFg grade which is as strong as Pyrodex RS. The problem a lot of then find with Pioneer FFg is it is very course in nature. Also there are issues with moisture problems when using it.

Triple Se7en pellets are equal in strength to Pyrodex Pellets in FFg. So you load according to what loads you would normally shoot with Pyrodex.

As stated, 150 grains of powder will usually do you no good in the accuracy department. All too often people are sold on the idea of 150 grain loads and they find that the accuracy goes right out the window. 100 grains usually work better.

If you have an inline, then start out with 80 grains of FFg grade powder and work up in 5 grain amounts until you get nice tight groups. They will normally come together around 100 grains depending on the projectile.

If your shooting a sidelock then start out at 70 grains of FFg and work up in 5 grain amounts until you get tight groups. Many times they will come right in at 70 grains.

Let us know the make of your rifle and what projectile your shooting and we may be able to suggest a better starting point for you. Most powerbelts shoot best with 90-100 grains of FFg powder.

There is also pure black powder and it will work great in any of the rifles you want to shoot....

good luck with your rifle. Any questions just ask. We'd rather have you ask then make a mistake and perhaps hurt yourself or someone else.