5.7x28 loading

There isn't a lot of data out there for this caliber. It's a very picky cartridge with very little room for error. I thought I'd start sharing some of mine in hopes either helpful or someone else posts some of there's. Again load at your own risk. I don't chrony any of these loads yet.

These are very light loads that I'll work up from. Mixed head stamp brass, hornady v-max 40 grain .224 and cci 400 SRP. Trimmed brass to 1.35, max length is 1.43 I believe and COL was 1.580".

4.3 grains of unique, which was probably a little off the bottom for this caliber but it has room for a bit more. A couple of tenths is a reasonably big move in this caliber. No signs of pressure in either my FiveSeven or my PS90.

4.3 grains of VV N340 which I'm going to move to 4.5. This one had a small touch of smoke compared to the unique. Cycled well and was very accurate. It would probably improve at 4.5 or 4.6.

I tried to use W231 but the loads were incredibly light at 3.3 grains. The w231 is very fast burning so I started in a careful place. It cycled in my ps90, was reasonably accurate but sounded like an air gun It didn't cycle the FiveSeven pistol.

I'm going to go to 3.5 and continue to try and work a 231 load because I have 8lbs of it. I have some loaded with AA#7 but haven't fired them yet.

I'm trying to use the most common powders to load the caliber other than the vhita vhouri which I just happened to have I'm happy the unique loads were good and as mentioned will hopefully have a good w231.

I have a few 55 grain loads I'm going to try because I have quite a large number of them.

Good luck and be safe when loading.