Home Forums Hunting & Shooting Custom Rifles & Wildcats 358 WSM

Shortly after the WSM’s came out I had a Ruger #1 made up into a .338WSM thinking that I would be ahead of the curve 🤣WRONG! They brought out the 325. Oh well. I am currently working on 250 gr load for it. Should get in neighborhood of 2650 from a 24” tube. Will be my son’s Africa rifle.

I’d love to learn of the powder and charge thereof that nets 250 gr @ 2700 from an 18” barrel in the 358WSM That would be sweet!

IMHO I think you probably are ahead of the curve. You will have a lot better bullet selection in a .338 than a .325.

Oh I know it. It’s why I chose the 338. I just thought the gun manufacturers would have the same forethought. Lack of headstamped brass is my only regret. Oh well.

I never thought at the time about the 35. I should have. It’s an incredible game killer. I sure hope the OP can get the numbers he wants. I’ll be watching with great interest.

I'm working on one myself...actually just waiting on a scope right now. I'll try to remember to post up my results when I start to break it in.

It's not a 358 WSM, but I've got a 375 WSM made by JES. I got it with a 20" barrel on a M70 classic WSM action. So far it's been fine, but I have had to neck ream newly necked up cases because they get a doughnut. First cartridge I've had to do that. It's got a very tight chamber - probably the bottom end of spec, but I've never cast it. Dies are CH4D - they were in stock, so that was easy. I had to spend some extra to expand my neck reaming setup though so it wasn't the cheapest thing to get into.

I'm going to have to see if I can modify a Lee .325 WSM factory crimp die. I don't want to pay $100 for a crimper from CH4D.

If I ever take it to Africa I'll have to get RCC to make some cases with the right headstamp.

Load data I just used QuickLoad and GRT and it was close enough not to blow anything up. RL16 for 300gr A-Frame and 300gr Cutting Edge safari solids. I get a little over 2500 ft/s with both.

I like the .375 bore much more than .358, but I suspect the practical aspects would be identical for a .358 WSM.

I had one but changed the barrel out. Best load was a 225 grain partition, 72.5 grains of R-17 for around 2,900 fps. I'm pretty sure I was using Winchester .325 WSM brass.

Recoil was sharp.

I still have the die set if you're interested.

Not to steal from the original poster but smokepole if you have dies I’m currently looking for a set myself

Does anyone use pistol bullets for pinker or Small Game loads in these 35s ?

Is there any of the "custom" brass makers making headstamped 358 wsm brass/

VA Silent Arsenal claims to load ammo with proper headstamp, maybe they also do just brass. Not sure if that's a good option pricewise though.

yes sir ...... For a small fee RCC can make your headstamp "358 WSM"



358 WSM brass

Thank u i will get some RCC stuff, not impressed with VA Silent, try to have them build a gun that was not happening and they will not sell any components unless you have their gun which I tried to have. Black gun mostly is my opinion, not much for bolt guys.

so has anyone tried loading 180 or 200 grain Barnes ttsx bullets in 358 wsm?

Just looking at option and where to start, 23.5 inch barrel 1:12 twist

Thanks!