300 remington ultra mag.

[D4v5]

Just bought some Hornady 180 btsp interlock. my reloading books doesn't show any loads using IMR 4350 or H4831sc. Does anyone loads for these powders?

 

[NCsmitty]

I don't load for that, but www.hodgdon.com has loads for 180gr Speer using those powders, so use somewhere near the start load with the Hornadys, and use a magnum primer burning that much powder, and work up. The slower H4831 should give you quite a bit more velocity than the IMR4350, according to Hodgdon.
Maybe someone who loads that round will chime in.
Good luck.


NCsmitty

 

[rcmodel]

4831 is about the Fastest powder you should use with that bullet weight in the .300 RUM.

4350 is Way too fast for it.
You can get about 200-300 FPS more velocity with H1000 or Retumbo at less pressure.

And more velocity is the only good reason I can think of for the .300 RUM's extance in the first place.

rc

 

[MMCSRET]

I tried several of the older, traditional "Magnum" powders that you listed. I kept working and finally settled on Accurate "Magpro" as the best powder I could use on 300 RUM. It is extremely forgiving and provides great velocity and accuracy. I used several different 180 gr. bullets and only Winchester Large Rifle Magnum primers in Remington Cases. Great gopher gun!!!!!!!!!!