RE: Cast 38-55 gas -checks?
First of all you should be ashamed of yourself for not posting a picture of such a fine firearm.
If you cast from straght WW you should be able to push the bullet at 1600 and up to 1800 fps without any leading problem. Try Carnuba Red lube. I can get 1800 fps with mine without any leading issues. You might need the harder lube with the longer barrel, and it should help with leading. Try it first before you worry about GC's. Just make sure you have the barrel good and clean before you fire the first shot.
The 38-55 is a fantastic round. I have fooled around with one of the H&R Buffalo Hunter's, and it is a great shooter.
Do you have the short brass or the long brass?? Tom.