are the guns you are using high pressure steel shot proof, if not forget steel shot, are you loading 70mm, 76mm or 89mm, MEC 600jr machines will be more than good enough, if you are loading 89mm 12b and 10b the 10b steel master machine will do both with a couple of modifications, the 10b decapping rod needs to be turned down so it will fit inside the 12b cases and you will need a 12b crimp die and a 12b collet for the resizer unless you have an off press resizer, the single micrometer end charge bars are much better, powder bush one end and an adjustable shot dispenser the other end, i suspect that 2nd hand presses now cost a fortune, back in the day there were scores for sale on US ebay for about 50 quid plus shipping to the UK, they are a bit of a ball ache to set up correctly, once i had a machine set for a load that is all it would ever load and i would buy another machine for another load, in the end i had 6 12b machines, a 12 and 10b 89mm machine and some RTO basic gear for 8b, if you buy 2nd hand buy presses with steel crimp starters and crimp die bodies, much better than the plastic modern versions, american once fired cases are better than new chedite, either federal GMM or remington nitro are the best, if you are reloading steel shot dont be lured into trying to get as much shot as you can into the case, 24g in 70mm, 32g in 76mm, 89mm in 12b is a waste of time unless you are shooting massive pellets, BBB or T size shot, the nearer you can get to a square shot charge the better the loads will perform, i used to get 1800+ fps with 24g #3 steel shot in 70mm, 1650+ fps with 76mm 32g #2 steel shot, even in 89mm 10b i would load 36g steel BB at around 1600fps, the best powders back then were Aliant Steel, TK8 and CSB0