I just made a stew with lamb neck and was not really impressed (also, I think I damaged by knife trying to hack the bones up). I plan on using shoulder next time.
Anything with a lot of connective tissue works well for "low and slow" cooking like braising/stewing. Cuts that are already tender like rack and short loin are better used in other preparations. Shank would work well, but you'd have to pull it apart before serving. The shoulder could be cut up before hand. Shank works better just braised by itself.
I'd order them something like:
Shoulder
Shank
Leg
Rack
Short Loin
Your filling is basically a beef stew/casserole, so any cuts that suite long slow cooking are fine. They get cooked again while the pie is baked, so premium cuts will just be wasted
The lower grade and 'off cut' parts are what are most commonly used. Like rump, brisket, chuck, shank, neck etc
Using a bench top slow cooker makes cooking this all very easy. The beef needs to be fully cooked before making the pie. An eight hour slow cook is fine
You want the pieces to be a variety of sizes to fill out the pie shape, but make sure you have some at least the height of the pie filling. The larger pieces tend to be better, but that could be a matter of taste and culture
You need to get rid of plenty of fat before and after cooking. A mouth full of fat in a pie is not nice. There is already plenty of fat in the gravy and pastry, so trim off all you can
A good meat pie should have a solid layer of meat connected with gravy, not swimming. It should also not be so full as you can't eat it with your hands (for a single serve pie) without loosing half the contents
Puff/flakey pastry works best and holds everything together
Avoid overly strong flavoured gravies, you don't want to hide the beef and pastry taste
Before you attach the lid, place a slice of tasty cheese, or an extra generous serving of cracked pepper on top of the filling
A respectable pie looks like this - thanks to Ponsonby Pies (not made in Ponsonby anymore)
Best Answer
Assuming a long, cooked stew. I cut up a well marbled chuck steak usually and chuck is what I'd recommend. You want enough fat that as the stew cooks long, the fat will render and leave nice, tender meat. Too lean and you're left with boiled shoe leather.
If you want a quicker stew, use a leaner cut of meat like sirloin. It will have a lot of flavor but you shouldn't cook it long at all. A fatty cut in a short stew will end up very fatty and often tough (with a cheaper cut like chuck).