roundball said:
A simple, inexpensive alternative until you get a better feel for what you ultimately want to do is use a brass powder flask. The brass nozzles are interchangeable in different sizes to serve as powder measures.
Just hold your finger tip over the end of the spout, press the spring loaded valve button to let it fill up with powder, release the valve button and then pour the spout full of powder down bore.
(or just fill your own powder measure from the flask)
I have these flasks in range boxes filled with Goex 4F as a convenient re-supply source to refill pan primers after every range session.
They run anywhere from $18-$22 bucks.
Here's one at Kittery up there in Maine.
http://www.kitterytradingpost.com/product.php/pid/2/sid/6/tid/34/prodid/10868
I would not recommend anyone use the brass tube type flask. They are too strong, thick walled, and will not burst until the pressure is higher than if it were a horn with a pinned in base plug.
I won't use them.
The higher the pressure the worse the injury is likely to be in the unlikely event it has a "fast fire". Also powder horns are not good conductors of heat or electricity.
Gluing in powder horn base plugs is a bad idea for the same reason, is increases the pressure before something "vents".
I have a brass tube primer I really liked but I stopped using it for the same reason.
I am sure this is one reason that traditional powder flasks are so thin.
Also its a very bad idea to load from direct from the flask.
If someone thinks this hype I suggest that they test a simple nailed base horn, a horn with the base epoxied in and a brass tube flask see which one is the most "explosive" and throws fragments with the greatest force.
The more its contained the more destructive BP will be. For example a full case of BP in the current plastic bottles, fuse a center bottle and set it off. At most 4-5 others will fire, the rest are just scorched (a guy I know bought a bunch of powder that a distributor had tested in this way blackened labels and all).
The plastic fails at low pressure and the explosion is low order, a fast fire... Contain it too much and it starts to work "better".
Dan