I've been using 0.357" bullets in all my 9x19s for about 45 years. Folks were using 0.357" bullets before I ever came along. In the 70s, there were virtually NO 0.355" bullets even being produced, much less available at the LGS.
All you do is find the COL that feeds and chambers and then work up...
Slug your barrel and order lead bullets that are at least 0.001" larger than groove diameter. You do no need HARD alloy, 13BHN is more than hard enough. Even use it in rifles with gas checks. Lead and jacketed bullets are very accurate.
452-200-SWC.
Never had an issue with ANY 1911 feeding SWC bullets and they give the best accuracy.
Follow Lee instructions to the letter. Aluminum molds must be HOT and they cool down real fast, so you may have to insert a corner in the melt to get it hot.
>I guess more specifically, how many grains of powder do you increase per loading,
From stat to max, I break it down to have about 5 increment. That prevents any sudden pressure problems. If I see there is less the 0.5gn from start to max, I tend not to use that powder.
>seating depth,
I...
Since 1911, Bullseye has been the first choice of powder for .45 Auto.
Clays (be sure it is NOT International or Universal, but just Clays) is OK, but the accurate load range is about 0.05gn, while Bullseye is accurate over the whole safe charge range.
For my .45s, the most accurate powder was...
SAAMI COL is 1.085-1.135", but for the reloader, all that matters is getting a COL that feeds and chambers in their gun and working up the load at that COL (remember, you are not loading for ALL guns, only YOUR guns).
In my main .40 S&W, the throat is long, so I load as long as 1.225".
If the...
Any particular powder?
Something from Bullseye to Unique.
Just remember, you don't need Bayou data, you just need lead bullet data for that weight bullet and start at the start load.
Hodgdon, Lyman, Hornady, and Lee have data, just to start. You can go to handloads.com
What do you want? If you have specific powder or other requirement, let us know.
With a turret, the best you can do is process one case to loaded round at a time, dragging the tool head to each position--so one loaded round could take 3-5 pulls of the handle. With the "crippled" 550, you procrss four cases with each pull and with the 650 you process five cases with each...