That is... impressive!
Thanks! It's been many many years of research, development and refinement. Hopefully many more to come!
having the powder thrower drop the weighed charge in the case when it's ready and in position is slick. At first I was thinking 'why?'... until I thought about the times I've had someone/thing distract me, and ended up dumping powder down the funnel with the ram/shellplate *down*
Yep. I think I did that twice before deciding I needed to come-up with a better way. But the more important aspect is that interrupting the cycling of the press (to drop the powder mid-cycle) does not lead to consistent press operation, and cycling the press in a consistent manner is especially important when several things are happening at once.
I do get where people who are committed to the very nth degree of accuracy want to control each and every step along the way, using single stage presses, hand trimmers and hydro seaters. I have all those things. I just don't like using them very much any more.
I know what you mean. A common philosophy seems to be "what can I do that *might* improve my ammo", whereas I look at it more like "what can I *not* do that I can demonstrate will not have an effect on my results". More time on the range, more plentiful supply of quality, cost-effective, ammo. More time in the wind. It has worked for me - but of course, with iron sights and a sling I'll never see any benefit to reducing groups below half a minute at 1000.
There was a time when I was shooting almost full-time, and I could happily spend a day a week loading. Eventually reality struck and I went back to work (which involved an international weekly commute). That's when a 1050 entered my life, as I needed to load the weekend's ammo before my wife realized I'd got home on a Friday evening
The charge/seat portion... honestly doesn't look much, if any, faster than what I get with my 550 + AutoThrower + AutoTrickler. I've never timed or videoed myself doing it though, so I might be all wet on that.
Maybe, but I'm not sure the AutoTrickler can dispense in 6 seconds from empty. Would be interesting to see the comparison. As I was starting 'from cold' and thinking about video things I wasn't quite at my slickest in that segment.
I started with an M die. They have a bit of a reputation for inducing a little bit of runout, hence I switched to the Sinclair and some custom mandrels.
I think the main thing for progressive precision is to separate any 'forceful' operations that could have an effect on other operations - that's mainly anything involving the shoulder. If you're setting the shoulder at the same time as trimming, for example, you'll see a little more variation in trim length. In my 2-step case-prep process, the shoulder is basically set in pass 1, so pass 2 is usually just sizing the neck while trimming (although it gives a second attempt at nudging the shoulder on a case that was a little stiffer than the rest).
Also, keep an eye on your shell-plate to see that there is no correlation between any variation and a particular station. I've replaced a shell-plate or two after attempts to free a stuck case left one station maybe 0.001" or so different from the rest.