Thread: 357 mag subsonic reloading data

Good morning all.
First time starting a Thread so please be gentle.
Does anyone here have experience or data they are willing to share regarding 158gr subsonic loads using powders other than Trailboss as I have that sorted but I’m running low on Trailboss and Hornady’ s SWCHP’s.

I’m not looking for 38spl data as I have heaps of 357 brass and am not keen to buy more brass.

I have some AP70 but find it very inconsistent with velocity with lead projectiles. I have tried both the Hornady and Speer 158gr SWC HP’s. I haven’t tried it on jacketed projectiles yet. I have 1000 Noslers JHP’s coming.

Using mixed brass, small pistol primers, seated out to what I have found works best with a light crimp. I have a Lee die set but also have a Hornady but haven’t used it yet.

Very happy with the Hornady SWCHP’s/Trailboss combo as it is what I think, very accurate and my ES is roughly 10fps, 1020-1030ish, the Speer aren’t accurate or consistent no matter what i seem to do with them.

I run them in a Bergara single shot 16 1/2” topped with a AR Bushnell 3-12 with BT and BCD zeroed at 50yrds.

Good for 1 n a bit Moa running the Hornady at sub speed (have found the sweet spot) and bang on moa with XTP’s, 125-158’s. 125 remingtons run at about 2-1/2.

Strelok sorts the Rabbits, Magpies n Plovers to 150with subs without disturbing the stock or the Fallow where I shoot. Also good on the Fallow.

I am pretty impressed with the combo and it is getting a heap of use but I am running out of components for my current loads.


Anyway, keen for some ideas.
Cheers