357 Magnum Primer Question using H110, IMR 4227 or Unique

[Tempus Tom]

Hey friends,

I am relatively new to reloading and want to load some 357 magnum ammunition for my father as a Christmas gift. I have not previously loaded for this caliber.

I will be using Hornady 125 grain XTP bullets and according to my Hornady manual, all of the loads require SP magnum primers. All I have are CCI #500 SP primers.

However, in my Lee manual, it has data for the 125 grain XTP using Unique powder. And it doesn’t appear that this load requires magnum primers.

The powders I currently have that may be useful for this application are H110, IMR 4227 and Unique.

Out of those three powders, I need to use Unique, correct? (Since I do not have SP magnum primers)

Any help would be greatly appreciated. Thank you.



Brass: Mixed
Bullet: Hornady 125 grain .357” / 38 cal
Powder: I have IMR 4227, H110, Unique
Primers: Only have CCI #500

 

[Rod47]

That would be your best choice.

 

[Blue68f100]

Unique is fine with std primers.

H110/W296 require Mag Primer with a heavy crimp. Powder good only for full house magnum loads.

 

[Obturation]

You got it. Won't get the best velocity with unique but the spp will do fine.

 

[Tempus Tom]

Thanks guys...just wanted to make sure I correctly understood what I was reading.

 

[Charlie98]

Although I also recommend Unique, IMR4227 doesn’t necessarily require Magnum primers.