What are good natural peak targets for a powerlifter? I mean what would be respectable and what should I be aiming to achieve naturally? (in my case a 242lb class lifter)
I'm not trying to be a smartass with this reply, so please don't take it that way.
I've gottten to the point where I think asking questions like "whats strong for a natural at my weight class" or "whats respectable" or anything like that is a subconscious means of shooting yourself in the foot.
You want a goal? Then look at the rules of the federation you compete in and figure out what it takes to total ELITE. That should be your goal. Once you total ELITE, your goal should be state, national, or world records.
Don't get caught up in what some other schmuck thinks is "respectable". What'll happen if you do that is you run a very good risk of cutting yourself back once you get close to that arbitrary number. You can start thinking "damn I'm strong" and you don't stop to realize you haven't reached your potential yet, but you don't strive for the limit either. I think I sort of did this for years. Then I got smarter. Just get under the bar and lift the heaviest possible weights you can.
Even if you don't compete, chart your PR's and make sure you are constantly increasing on what you've got as a personal record. If you don't set mental barriers for yourself, you very well may surprise yourself with what you are actually capable of doing.