Seating 9mm with 357 seating die...

[Geofois]

It seemed to work great. I have like 1200 sized 9mm cases so figured I'd try some and see. Sure enough the powder through die was able to be adapted to flare the mouth to take a bullet fine. I even read a discussion where the 357 expanding die is better for lead bullets and mine are really soft swagged bullets I got for free. Then just adjusted the 38/357 die farther down and it sat the bullets just fine. I just need to crimp them so probably no way out that and need to buy maybe the lee fcd. Anyone got a taper crimp die laying around you want to get rid of?

[alpha_romeo_XV]

I use my 9mm crip die for both 9mm and 357sig but check if you even to crimp your rounds. Lead should grab neck good and chamber OK if not overflared.

[Geofois]

That's good to know. The ones I sized I can avoid flaring too much but a few hindered were already sized and flared so flared just a bit too much to avoid. I wonder if my 357 fcd will tap the flare down flat since it also has a carbide ring and kinda resizes I think. I'll just order one on midway. I need a chrony diffuser kit and they have that for $9.99 in sale and I see die sets and dies on sale for a good price.

[Bastard]

use Lyman M expander die or the Redding equivalent for cast...

while I see no reason that the seater die wouldn't work I also don't see the point - I mean if you want to keep having to reset the die every time you want to switch calibers but other than that why not just buy the correct die set?

[Geofois]

Like I said, I happen to have a ton of sized brass and a few hundred already primed and flared so wasn't trying to give a reason to never buy even a whole die set but I think I was saying I do need the correct 9mm taper crimp die. I think alpha was also saying to use a 9mm die. Maybe you misread. I will say sometimes the "correct" die set is incorrect for a specific bullet. If you are loading 44 mag lead and noticing lead shavings when you seat it's because many seating dies are so tight(probably for a good reason most of the time) they tend to push the flare in causing the lead bullet not to seat correctly so if you use a 45 acp seating die it seats it much better with no shavings and you end up with a more accurate round. I wouldn't be surprised if using a 357 seating die would work the same in that it might be .001 or .002 wider. For me personal I have a few different weighted 357 bullets so I'm going to be resetting my die anyways and I load like 10 calibers so it's not a big deal.

Edit: Some cool calgunner sold me a lee 4 die set so I'm totally set, thank you. I'll still use the 357 seating die and case mouth expander for soft lead but for my fmj bullets and hard lead I can get busy =)

[hambam105]

https://youtu.be/pcc91NArteQ

[Geofois]

Thanks, that makes sense. I figured it was 2 different things flaring and expanding but didn't know it was already a really developed process. I used all my soft lead swagged bullets so now going to the harder one so regular flaring with the 9mm powder drop die is probably fine now.