Hi New to the fourm I have a tc firestorm and l am shooting a 385gr hollow point Hornady great plains and 90grains of fffg pyrodex and ffffg in flashpan is this what i should be loading? Thanks for any help.

Well it is really hard to tell someone what to shoot. You have to decide what you want to hunt, and what hunting situations you encounter. Then consider accuracy. At least you have plenty of knock down power with that load.

Of course, different barrels behave differently. But every gun I've tried them in shot the 385 grain Great Plains bullet best with charges around 70/75 grains. Groups would begin to open up with anything over that. Seventy grains will still push that big chunk of lead in one side and out the other on a whitetail.

Your 90 grain load will give you a flatter trajectory though. That's what I would stick with if you're getting good accuracy with it.

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90 grains of FFFg Pyrodex? That is the Pyrodex P that you are talking about?
The flash powder, FFFFg is black powder? Yes?
How is reliability of ignition? Pyrodex has a much higher ignition temperature than BP and is not usually a good choice for flintlocks. (The Firestorm is, IIRC, made to light Pyrodex).
My suggestion, always, is that, since you need BP in the flash pan, why not just use BP for the main charge?
FFFg is too fast for my tastes in a .50 cal rifle and 90 grains of it too heavy. I use 90 grains of FFg behind a patched round ball (about half the weight of your 385 grain bullet) in my Lyman GPR.
Pyrodex P, IIRC, is recommended as a pistol powder and for small bore rifles. T/C specs FFg for that rifle.
Pete

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Good advice from Pete.

Replace Pyrodex with Black Powder and it'll work for ya. Also might try FFg as main charge. Nothing wrong with FFFG if you have it.

Check the manual for recommended charges and bullets. I dont have any experience with that bullet but similar bullets worked OK with that charge level for me. You will have to experiment to find the best load for your rifle. I would start at 65 grains and work up at 5 grain increments until you get best accuracy. I wouldnt go over 90 grains.

If you use FFF black powder for your main charge, you can use the same powder for prime. FFFg woeks great in the flash pan. This way you only have to get one type of powder, instead of two.