I went out and got all the stuff I needed to fire my  kentucky rifle,
another $70 on top of the $200 for the kit.
I was reading slowly to make sure I got it right ,I didn't want to blow my house up.Well it came to pouring the powder down the barrel and nowhere does it say how much powder ,the best I could find on line said "100 grams"  that was for any 50 cal rifle not just Kentucky,Ok I will take a chance on a 100 grams. Now can anyone tell me what a 100 grams look like ?  a teaspoon ? a table spoon ? a thimble ?
REmember guys I only have one face ,not cute but it's all I have,
so be sure ,  thankyou.     Mick

1st shot, I'd just make a spit ball to shove down there.
100 grams is ok, but I'd call it a heavy load.
generally do 50 to 70 for short range stuff.

You didn't get a powder measure?  
spend another 10 to 20.

It all depends on what size/shape of round you use and the distance you are shooting. GR does mean Grain. Shooting black powder is fun but can be tricky. Some powders my need more grain or less depending on the quality. I would say 75gr  would work great for a round ball at around 100yds. Would give you enough wallop for accuracy at that range. but shooting with ball, you get a lot of drop out of the round at distance. I could start ranting and raving about ammunition, kinetic energy, and shooting techniques. I will get off my soap box now!

Ok, I loaded her up fired ,just a sharp little crack as the cap went off,waited a minute tried again ,crack again,Mmmm .
I took the nipple off ,sure enough it was blocked ,I couldn't see through it,so I ran a very small drill through it,it cleared it and made the hole about 2 thou bigger. tried again ,CLick crack,BOOM,not only that I hit my target ,a one gallon paint can,dead center.
A very nice feeling. and thank you all for your help, And you Mike.

Mick, Here's some load information  for black powder guns
http://www.investarm.it/media/pdf/manuale_avancarica_uk.pdf
Investarms is the company that made the .50 cal Hawkens I've been shooting. Get a powder measure to get your load right and have fun.

Just to help clear a few things up it is 100 grains not grams which you have already figured out thank god. The most you can go is 150 and that is considered a magnum load. the lightest is probably 50 or so any less and the sabot or ball will not really fire but be more like a lob. Always treat it like it loaded no matter what. That is the number one rule in firearms and it saved my life once. Someone had left a load in a black powder for who knows how long. I put a cap on it and fired it with some wadding to see if it was clear and wouldn't you know it BOOM. Experiment with different loads and projectiles til you find the one that works best for you. For me I use 150 gr load which for some reason has almost no kick in my gun but 100 grs will knock you off your feet. I'm told it has to do with the balancing. I myself use pyrodex pellets that come in 50 gr sizes and just drop 3 of them down the barrel then my sabot which is a powerbelt. Always make sure you have your projectile tight against the load too. Put a mark on your ramrod when it is empty where the end of the barrel is then another after you load it that way you can always tell if it is loaded properly or not.

Sounds like a great time of discovery. Enjoy the new toy, you've put a lot of hard work in it.

And when you pack down that powder, don't put your finger on top of the ram rod.  
If it goes off, it'll take your finger with it.  You need all you got left.
You'll have to type with your middle finger and your typin's bad enough as it is.