The Accurate Reloading Forums
Load data for 358 TUM with heavy bullets

This topic can be found at:
https://forums.accuratereloading.com/eve/forums/a/tpc/f/2511043/m/5291019232

18 June 2017, 10:21
tysue
Load data for 358 TUM with heavy bullets
Have a friend with a 358 Towsley UtraMag, who wants to load his with "heavy" bullets, 275s and 300s, but no load data (at all, let alone heavy bullets) he got some data from Towsley, but for bullets only to 250 grains.

Anyone have any data, please let us know.
19 June 2017, 10:04
capoward
Try looking for load information for the 360 Imperial Magnum; its an improved 404 Jeffery case necked down to .358 caliber. The case capacity should be close to your 358 TUM cartridge.


Jim coffee
"Life's hard; it's harder if you're stupid"
John Wayne
19 June 2017, 12:52
georgeld
Thanks Jim;
This was posted for me.

The beginning load I've started with was: 250gr, 90gr 7828, 15 shot avg was 2884fps. Towsley had a bit more powder and 3100fps in a 24", my rifle is 26". He feels I should easily get 3200fps with the 250's.

I haven't gotten back to it since that day. I do have loads with the same bullet up to 100gr.

That's as far as I've gotten so far mostly due to health issues.

The proper names for this is: .358UMT, or .358/300U/m

Thanks again,
George


"Gun Control is NOT about Guns'
"It's about Control!!"
Join the NRA today!"

LM: NRA, DAV,

George L. Dwight
19 June 2017, 13:36
capoward
Hi George,

Does your rifle handle 3.6" or 3.8" COAL loading data?


Jim coffee
"Life's hard; it's harder if you're stupid"
John Wayne
19 June 2017, 22:00
capoward
I checked "AmmoGuide Interactive" today for a similar cartridge to your .358 UMT and located the .358 Ultra (a .358/.300 RUM cartridge, 3.6" COAL) created by Michael458.

Listed are multiple bullet weight loadings by Michael (24" barrel CRF M70 Winchester) including loadings for the 280gr Swift and the 310gr Woodleigh.

Hopefully that information will help you in your endeavor.


Jim coffee
"Life's hard; it's harder if you're stupid"
John Wayne