300 WinMag Powder Choice Question

Sportdog · May 7, 2008, 06:02 AM

I'm an experienced handloader so I'm up to speed with safety procedures when working up loads. With all the different powders out there, which one's have you found that your 300WinMag likes? I have been partial to IMR powders and thought that IMR 4350 looks good for 180 grain bullets. Any suggestions or comments? Thanks

VaFisher · May 7, 2008, 06:26 AM

I have had very accurate loads using 4064 with 150gr Hornady SST bullets myself.

tom234 · May 7, 2008, 12:54 PM

I tried IMR 4350 with 180 gr bullets for .300 Win Mag but got better accuracy with IMR-7828. IMR 4350 has worked better for me in .30-06 180 gr loads.

bluedog · May 7, 2008, 01:05 PM

IMR 4350 is a great 30-06 powder and a good 300 Win powder for 165 & 180 grain....but you will probably like the slower 4831 better for the 180+ grain.

Shoney · May 7, 2008, 01:21 PM

From the late 60's thru the 90's I have wrung out my 300WM on paper and a lot of game animals. I've biggame tested 150, 165, and 180 grain bullets in a variety of brands.

I have found the most accurate bullet/powder combo to 500 yards is the 200 gr Nosler Partition with max load of IMR4831. Not only is the trajectory extreemly flat, but the energy retention is excellent.

Al Norris · May 7, 2008, 02:02 PM

Ruger KM MK-II 24" stainless, chrome lined

Hornaday 180gr. BTHP match or
Hornaday 190gr BTSP
72.2gr H4831sc
CCI 250
OAL 3.292

Held ~.5in at 200yds, prone with sling (military fashion).

While I liked IMR4831, the H4831sc - just metered better.

elkman06 · May 7, 2008, 09:05 PM

Quote:

While I liked IMR4831, the H4831sc - just metered better.

What he said...
elkman06

Meatco1 · May 17, 2008, 01:02 PM

Well, I have to agree with you, IMR 4350 worked best for me with the 180gr Noslers. With .670 3 shot groups, I don't see the need for futher testing on this sporter.

These are the powders I tried before settling on my best load.IMR-4831, IMR-4350, H-4381, H-4350, H-870, H-450.

I would have liked to tried out R-19, as it does look perfect on paper, but wasn't available when I was working out my best loads.

Richard

PS: Anyone local want to trade 1 lb (minus 15 loads) H870 for a like weight of Reloader 19?

rifle59 · May 18, 2008, 09:50 PM

Before I had my Model 70 rebarreled, RL-22 was good. Now IMR 4350 works great with 180gr Partitions. (3/4 inch @ 100yds)

May 7, 2008, 06:02 AM	#1
Sportdog Junior member Join Date: February 28, 2006 Location: Southwestern Michigan Posts: 369	300 WinMag Powder Choice Question I'm an experienced handloader so I'm up to speed with safety procedures when working up loads. With all the different powders out there, which one's have you found that your 300WinMag likes? I have been partial to IMR powders and thought that IMR 4350 looks good for 180 grain bullets. Any suggestions or comments? Thanks

May 7, 2008, 01:05 PM	#4
bluedog Senior Member Join Date: June 19, 2007 Location: Virginia Posts: 133	4831 IMR 4350 is a great 30-06 powder and a good 300 Win powder for 165 & 180 grain....but you will probably like the slower 4831 better for the 180+ grain.

May 7, 2008, 01:21 PM	#5
Shoney Senior Member Join Date: February 21, 2002 Location: Transplanted from Montana Posts: 2,311	From the late 60's thru the 90's I have wrung out my 300WM on paper and a lot of game animals. I've biggame tested 150, 165, and 180 grain bullets in a variety of brands. I have found the most accurate bullet/powder combo to 500 yards is the 200 gr Nosler Partition with max load of IMR4831. Not only is the trajectory extreemly flat, but the energy retention is excellent. __________________ I pledge allegiance to the Flag - - -, and to the Republic for which it stands….Our Forefathers were brilliant for giving us a Republic, not a democracy! Do you know the difference??? and WHY?http://www.wallbuilders.com/LIBissue...les.asp?id=111

May 7, 2008, 06:26 AM	#2
VaFisher Senior Member Join Date: January 24, 2006 Posts: 596	I have had very accurate loads using 4064 with 150gr Hornady SST bullets myself.

May 7, 2008, 12:54 PM	#3
tom234 Senior Member Join Date: February 14, 2008 Location: Kansas Posts: 753	I tried IMR 4350 with 180 gr bullets for .300 Win Mag but got better accuracy with IMR-7828. IMR 4350 has worked better for me in .30-06 180 gr loads.

May 7, 2008, 02:02 PM	#6
Al Norris Moderator Emeritus Join Date: June 29, 2000 Location: Rupert, Idaho Posts: 9,660	Ruger KM MK-II 24" stainless, chrome lined Hornaday 180gr. BTHP match or Hornaday 190gr BTSP 72.2gr H4831sc CCI 250 OAL 3.292 Held ~.5in at 200yds, prone with sling (military fashion). While I liked IMR4831, the H4831sc - just metered better.

May 17, 2008, 01:02 PM	#8
Meatco1 Member Join Date: September 9, 2006 Location: Southern Colorado Posts: 28	Well, I have to agree with you, IMR 4350 worked best for me with the 180gr Noslers. With .670 3 shot groups, I don't see the need for futher testing on this sporter. These are the powders I tried before settling on my best load.IMR-4831, IMR-4350, H-4381, H-4350, H-870, H-450. I would have liked to tried out R-19, as it does look perfect on paper, but wasn't available when I was working out my best loads. Richard PS: Anyone local want to trade 1 lb (minus 15 loads) H870 for a like weight of Reloader 19?

May 18, 2008, 09:50 PM	#9
rifle59 Member Join Date: September 8, 2004 Posts: 35	Before I had my Model 70 rebarreled, RL-22 was good. Now IMR 4350 works great with 180gr Partitions. (3/4 inch @ 100yds)