for you buckshot question:
i cast my own 00 and load 20 and 12. cast my own is where i save the most money since buck shot in bulk is expensive.
the 20 ga gets 8 each 00, about a 1oz load, this is for the son to keep in his room.
the amount of deformation depends on the lead hardness, just like casting handgun bullets.
if you want to check deformation then shoot into some gallon jugs of water, lined up single file.
for the 12 i've loaded 9, 12, 15 and 18 count 00 buck. 12 count is available commercially, but i've never seen 15 and 18. i don't load the 9 anymore, the 15 count is my favorite, there is just something about throwing 1.75 oz(that's 766 grains) of negotiations down range. i use Hodgdon Longshot for my buck loads.
as far as patterning goes, i'm more pleased with the performance of my loads than the factory stuff i've shot
for loading, i use my PACT powder dispenser to throw the powder charge, pack the 00 by hand and then crimp on the MEC650. I guess i can load about 50 shells an hour, i do it in stages instead of progressively. stage 1-prime, charge powder, place gas seal. stage 2-place teflon, pack shot. stage 3-crimp. the main thing is to start out slow, be methodical and develope a system that works for you.
i get my load components (gas seals, mylar wraps, teflon wraps) from Ballistic Products Inc.
i was going to post a link that will enlighten you about buck shot patterns, but i'm having trouble loading the site, i guess because i'm overseas right now. go here
www.theboxotruth.com , look in the original chapters and find 2 installments #44 and #45 about buckshot patterns.