3. Any recommendation on a display case?
This outfit makes some of the most affordable display cases whether for hanging on the wall or for placing on a flat surface:
http://hampelswoodlandproducts.com/index.php?main_page=product_info&cPath=11&products_id=6
http://hampelswoodlandproducts.com/index.php?main_page=index&cPath=4&zenid=cae08b28811267dd3a5b410b01381d3c
http://hampelswoodlandproducts.com/
1. What powder should I shoot in this? (I have seen arguments on both sides bp / subs)
Every powder has its own advantages and disadvantages.
Black Powder has the lowest ignition temperature but tends to leave more residue, except that some brands and granulations burn cleaner than others. BP can be hard to find for sale in some areas.
Pryodex P (which is 3F pistol powder) has a higher ignition temperature but produces more velocity than most black powders except for Swiss BP. Swiss BP is more expensive but also burns cleaner than most all other black powders.
Pyrodex is also the most widely available substitute powder, and is easy to find for sale at almost any gun shop.
American Pioneer Powder is a slightly weaker powder that produces higher velocity when it's compressed more during loading and ramming. Only the 3F can be recommended for C&B revolvers. It's also one of the easier powders to clean using water, but it's harder to find available in stores.
777 is one of the most potent substitute powders but also the most expensive. It produces a noticeably sharper felt recoil and the volume should be reduced by 15% to equal any black powder load. If not careful, loading too much 777 can damage a brass frame revolver just as overloading with any powder can over time.
But 777 will harm the brass revolver more quickly if conservative loading recommendations are not adhered to.
2. What grain count should I use? (pietta manual says: 12-15rec, 35max, 28pyrodex. Cabela's manual says: 35bp, 28pyrodex)
Many folks on this forum recommend to only load 25 grains or less of any 3F powder in brass frame .44's, and 15% less volume of any granulation of 777.
More of any brand of powder can be loaded from a safety standpoint, but no one knows how many rounds can be fired without starting to cause damage from wear & tear, battering of the recoil shield, loosening the arbor, or possible frame stretching.
4. what are the best accessories to buy? (brands) (powder flask, measure, cap holder etc.)
I strongly prefer the large Traditions brass powder flask because it has a simple to manipulate thumb operated push button release valve. It can last a lifetime. Traditions also sells a smaller compact version of the same flask.
These brass flasks are available with free super saver shipping from Amazon if purchasing $25 worth of accessories which is easy to do by adding a Traditions pistol powder measure, capper, loading stand or any of the other Traditions C&B revolver accessories to the purchase that are sold directly by Amazon from their own warehouse, but not from other Amazon resellers.
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=traditions+black+powder+accessories
http://www.amazon.com/gp/offer-listing/B000PW9EJ6/ref=dp_olp_new?ie=UTF8&condition=new
http://www.amazon.com/Traditions-Performance-Firearms-Muzzleloader-Tubular/dp/B000PW9EJ6/ref=sr_1_1?ie=UTF8&qid=1356492954&sr=8-1&keywords=traditions+powder+flask