Okay, so I'm a reloader and not a hand loader. I want to crank out some 9/10mm rounds on my progressive press. I don't have a chronograph and really I just want the gun to cycle properly while poking holes in paper at the range. How much effort do I put into a proper load workup before I commit to any volume? I'm leaning 231 for the 9mm and HS6 for the 10mm based on the recommended powders in my Lyman manual. Is there any reason to believe a 'middle of the road' powder charge wouldn't be sufficiant for my needs? How many rounds is a reasonable test before I crank out 500 rounds? If I do decide to 'tinker' how many rounds would you make per powder charge and how much change would you make in the powder charge between test batches?