What is the best 300 win Mag powder

[tanka]

I'm new to reloading 300 Win and I'm stuck between RL 22, IMR 4350 and H4831. What powder is good for the 180 gr bullets. I have read that standard primers work better for the 300 win. I will work the load up, just need opinions on powder choice. Its a 24inch barrel on rem 700 action.

 

[BountyHunter]

4831sc

 

[Bart B]

IMR4350 and a few others of that speed has produced the best accuracy with 180's through 200's in competition with the .300 Win Mag.

Several slower powders shoot those bullets out faster with the same peak pressure, but they may not all land on target too close together.

 

[Broz]

H-1000 has been very good to me. But I load mostly 210 to 230 gr bullets in the 300 wins. That said it is also very accurate with great velocity in the 7mm/300 wins with 180's.

Jeff

 

[Derek M.]

I have used ALL of these with equal success with varying 180 bullets from Nosler, Swift, Hornady, Speer, etc.:

H1000
Re22
IMR4831
IMR4350
H4831SC
VV N560

For me it was a toss up between Re22 and H1000. I owned 2 different 300 WMs and together, killed more game with loads using Re22. Just got best velocity and accuracy year after year.

 

[johnnyk]

I get sub 1/2" from 180gn SMK's and a max load of RL22 and 9.5M primers. I use the same powder charge but swap out primers with CCI BR2's when using 180gn Ballistic Tips. When loading the 185gn VLD and the 190 SMK, I use H1000 w/CCI 250's and accuracy is unbelievable! Good shooting! JohnnyK.

 

[Spuds]

+1 for H1000 and CCI 250. Very accurate in my rifles with both 185 Berger and 180 Scirocco.

 

[Firearrow]

My old barrel liked 4831sc over h1000. But h1000 did provide a bit more speed.

 

[Marble]

Mine likes H4350 and 180 accubonds. RL22 wouldnt do it in mine.

 

[txjohn]

Have not had any luck with H-1000 but have excellent results with IMR-7828

 

[Lefty7mmstw]

165 to 200 grain- rl22
180 to 220 grain- 7828 or h1000
newer h4831 blows chuncks compared to war surp stuff imo; I've shot both and there isn't really any reason the new stuff should be so slow as the pressure comes up the same; the last time I tried both in the same rifle ( a 300win remmy with 180's) new manufacture h4831 was over 100 fps slower with equal or higher pressures.

As to primers, you can get by just fine with most stick powders on standard primers in a 300win unless you are shooting in cold (sub freezing) weather. I use 215's in my 300win, 7stw, and 300 rum; my other larger cal's get a mag primer but not always a 215; I'll shoot in some darn cold temps. though.

 

[txjohn]

Lyman's #49 calls for Win. LR primers for the 300 win. so you can use standard LR primers. I have had good luck with the 4350's with 165's-180's and R-22 and IMR 7828 for 180-200's.