70 grains with a round ball works best for me. Anything under about 50 or over 80 and it starts to get erratic.
427871
twice the caliper plus 2 or 67 max
fill it all the way up get 1000 fps no worry about blowing up
Use the same amount of Pyrodex as you would regular Black Powder or as stated in the manual. The answer depends on what type of shooting you are doing. You would load maximum load if you want to kill a deer. Are you loading a round ball? OR a sabot round with a hollow point? I have another brand of Hawken .50 caliber and I load 90 gr. I use a .490 round ball with a patch that is 0.010 inch thick. Less would be acceptable if you are shooting at short target range. You should try various types of loads and patches and bullets with each gun to see what gives you the best accuracy OR the best knock-down power. You can always start loading the same amount of grains of powder as the caliber of the rifle. Start with 50 gr and fire some test rounds. The old codgers had a rule of thumb. Place the ball for the rifle on a table. Pour powder over it until the powder piles up high enough to completely cover the ball. Scoop it up and measure the amount.
27 grs of FFF Blackpowder.
Without additional information, it would be impossible to give you much information. That appears to be a serial number, which would indicate a modern reproduction of a Hawken rifle.
100-300 USD
50-300 USd
You need to contact the maker or get a book on Blackpowder shooting that has loads in it. Different types of weapons and projectiles and powders will determine what is a safe load.
There are hundreds of possible loads, depending on WHICH powder, and WHICH bullet. Rather than give you a load, we would rather refer you to a good reloading manual. Lyman makes a very good manual. The amount of powder must be correct for THAT type of powder AND the weight/type of bullet used.
You need to give us a lot more information before we can make an educated guess. On a true antique Hawken, the condition will determine the value. You will really need a hands on appraisal.
You did not say what brand- Hawken style rifles were made by several companies. Traditional sidelock rifles are not as popular as they once were- due to the in line muzzleloaders. If it is a T/C Hawken, around $200 would be a good price. PS- I love mine.