I need help with everything

Do you have a reloading manual?

Pick a powder that is kind of in the middle of the road performance wise and you can't go too far wrong.

For a new reloader I'd suggest either 7.5 grains Unique for "good" performance, or 14.0 grains 2400 for full blown magnum loads.

I might lean more towards Unique for your home protection needs, as muzzle blast & flash indoors would not be quite as bad as 2400.

rc

6.5 grains Bullseye will work, but a slightly slower burning powder would be much preferred.
It is far too easy to get in trouble with high pressure Bullseye loads.

I assume you are crimping with a Lee FCD die?
If so, forget "turns".

Screw the die down until it contacts the shell holder.
Then screw the center stem out until it doesn't do anything when you run a seated bullet up in the die.

Now start adjusting the center stem down a little at a time until you get the crimp you want.

If you are crimping with the seating die?
Back out the die and seat a bullet to the crimp cannulure.
Now back out the seating stem and screw the die in until you feel it contact the case mouth.
Then screw it in a little at a time until the crimp is right.
Now, run the seating stem back down until it contacts the bullet again.
After that, fine tune as necessary while actually seating and crimped a bullet.

rc

Are you trying to duplicate your HD loads or are you actually working up a load for HD?

I use 2400 for 357mag some like it others don't but I have been for 30+yrs.

I suggest you actually buy what you want for HD. Then try to match it as close as possible. Mfg use a low flash powder that is not available to re-loaders.

Consider 6.5 grains Bullseye a MAX load.

Reduce 10% and work up in your gun as always!!

Stop if you notice any sign of sticky case extraction.

Like I said:
It is far too easy to get in trouble with high pressure Bullseye loads.

rc

I used Unique as my .357 powder with 158g bullets when I started reloading around 1980.

Unique is, well, UNIQUE~!

For plinking loads I go Bullseye.
For serious workloads in the .357 I go with 2400.

You'll need to adjust the crimp to what looks right and doesn't allow the bullet to be pushed back in when pressing it against a solid surface such as your loading bench. There is no specific number of turns that is the standard. Also due to different brass lengths, if your not trimming all of it to the same exact lengths, is going to cause some to have more or less crimp than others.
As for powder choice, it depends on what level of performance you desire. 2400 is near the top for magnum performance, with H110 and 296 being at the top for full house magnum loads. My own personal opinion, being that your brand new to this process, would be to use a powder that will not easily let a double charge slip by. 2400 is good in that respect as it does fill the case up enough that a double charge would be difficult to miss. H110 and 296 will absolutely not allow a double charge without making a spilled powder mess. As for me, I load exclusively with H110 or 296 simply because I desire my 357 mag. to shoot a magnum load all the time. I've heard some complain that full house magnums loads will cause your revolver to get loose, but in almost 3 decades of loading for my .357's and other magnum revolvers I've yet to experience such a problem.
I've worked in the retail end of guns and reloading for some time now and have seen a lot of firearms destroyed by accidental double charges and squibs resulting from the lack of attention to the important details, and to blame as well, is the use of powders that allow such mistakes to easily slip by an untrained eye. So to sum it all up, reloading is something that requires all of your attention and fail safe steps to prevent human error from winning. Even now, after all these years, I still inspect each case before seating the bullet.
Another tid bit of safe reloading is to always use a scale, even if your using a powder measure it is necessary to calibrate it with a scale. Powder measures don't ever, at least in my experience, throw the charge indicated they should becuase of density variances from one lot to the next. And even within the same lot powders can change in density from exposure to the elements.
Good luck and I hope everything works as planned for you!

FWIW, I read once that it will be harder for your lawyer to defend you in court for shooting someone with handloads than factory ammo. Something about, if you handload you can be portrayed as a gun nut, and "what's the matter, factory ammo doesn't do enough damage for you, you sick f@#$??? You have to make your own??"

For that reason, I've always stuck with Federal Hydrashoks as my nightstand ammo.

Railrunner85 said:

Plus it's more of a SHTF load than a home protection load.

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Gotcha. In that case, my favorite is 14 gr 2400 under a MBC 158 LSWC. Very accurate out of a 4" SW 686, very manageable recoil, not much fireball.
I've got several hundred of these in stock.

Welcome Railrunner85, Where are you in WV. I'm in Wood Co.