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#6148921 - 01/22/16 11:50 AM 300 win mag powder??
sauce06 Offline
Light Foot

Registered: 12/06/12
Posts: 10
Hey all, i recently was given a winchester model 70 (post 64) in winchester 300 mag. I have been loading for a few rifles for a while and the slowest burning powder i have on hand is imr 4350. I tried working up an accurate load with this powder and 180 gr pills, but no dice. Best groups from 65 to 67.6 grains was 1.5 inches. Does anyone have any recommendations for a new powder to try? Really would like to stick to 180 grainers. I should note that with the 4350 it showed early pressure signs (around 67 grains). Im guessing the 4350 is just to fast burning. Anyway, any reccomendations would be helpful. Thanks!

#6148984 - 01/22/16 12:14 PM Re: 300 win mag powder?? [Re: sauce06]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 17301
Loc: Wolfe City, TX

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#6149013 - 01/22/16 12:25 PM Re: 300 win mag powder?? [Re: sauce06]
Elpatoloco Offline
Bird Dog

Registered: 07/10/15
Posts: 283
H4831 SC

#6149066 - 01/22/16 12:55 PM Re: 300 win mag powder?? [Re: sauce06]
km_stevens Offline

Registered: 10/17/06
Posts: 155
Loc: Midlothian, Texas
I've had good luck with IMR4831 and H4831SC. Most recent load with IMR4831; 69.5gr & 180 accubond have been good but havent tested past 300 yrds.

#6149133 - 01/22/16 01:23 PM Re: 300 win mag powder?? [Re: sauce06]
sauce06 Offline
Light Foot

Registered: 12/06/12
Posts: 10
Thanks guys, i believe i saw those powders in stock last time i checked out the gun shop. I heard h-1000 was used in the military m248 load. But that was for a 220 gr pill. Anyway, ill pick one up when i get out of work. Any proven load recommendations for the 180 grain loads with the h-1000??
I like the idea of the 4831 since i can load it in my 25-06 too...........decisions decisions.

#6149154 - 01/22/16 01:37 PM Re: 300 win mag powder?? [Re: sauce06]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2520

Lighter bullets may need a bit faster than retumbo

#6149486 - 01/22/16 05:09 PM Re: 300 win mag powder?? [Re: sauce06]
DStroud Offline
Pro Tracker

Registered: 11/02/11
Posts: 1136
Loc: Waco

#6149533 - 01/22/16 05:44 PM Re: 300 win mag powder?? [Re: sauce06]
30378 Offline

Registered: 02/14/09
Posts: 2817
Loc: Deer Park, Tx.
NRA Endowment Member - Free men should not be subjected to permits, paperwork and taxation in order to carry a firearm.

#6150390 - 01/23/16 10:45 AM Re: 300 win mag powder?? [Re: sauce06]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9157
Loc: Lewisville, TX
H4831, IMR 4831, H1000, IMR 7977, 4000MR, all good choices for the 180 grain bullet weights.
Type 01 and Type 06 FFL

#6152014 - 01/24/16 01:24 PM Re: 300 win mag powder?? [Re: sauce06]
Gatorpoint Offline
Bird Dog

Registered: 08/04/10
Posts: 484
Loc: Nacogdoches, TX
I have a first gen Rem 700 sendero and mine shoots 180 accubonds over 73.5 gr RL-22 pretty well. Hope it helps.

#6152691 - 01/24/16 07:13 PM Re: 300 win mag powder?? [Re: sauce06]
sauce06 Offline
Light Foot

Registered: 12/06/12
Posts: 10
Well, ill be off tommorow so im going to hit the nearest gun shop, pick up one of the aforementioned powders and start testing some loads. Will post any positive results soon and thanks all!!

#6152704 - 01/24/16 07:21 PM Re: 300 win mag powder?? [Re: sauce06]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6094
Loc: Wise Co.
If I was going to shop for a new powder to shoot 180s in a .300 Win Mag, I think I'd be looking for Re26.

Originally Posted By: Cleric
God I am hating caliber threads more and more

#6153047 - 01/24/16 10:10 PM Re: 300 win mag powder?? [Re: sauce06]
WileyCoyote Offline
Extreme Tracker

Registered: 09/01/04
Posts: 4466
Loc: The Dogwood Capital of Texas
My now departed early '90's M70 Classic SS 300 Winnie was not too picky, but under it's preferred diet of 180gr SBT's, or 180 gr NBT's/NAB's it was a dependable MOA or better in my usual 4 shot groups when I was having a good blood pressure day, stoked with the Sierra Book Accuracy Load of 71.6 gr's of IMR 4831, in either RP or WW brass and lit with RP Magnum primers. I am quite certain that a better trigger & glass would have helped make it mo bettah.
Politicians are like diapers, needing to be changed often, and for the same reasons....Robin Williams

TooTaToo...We have MET the Enemy...and He is US !!... Pogo

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#6153397 - 01/25/16 08:46 AM Re: 300 win mag powder?? [Re: sauce06]
papa45 Online   content
Bird Dog

Registered: 05/14/07
Posts: 458
Loc: Arlington
I load mine with 69-70 gr IMR 4350, depending on the bullet, with no pressure signs.

#6153958 - 01/25/16 01:54 PM Re: 300 win mag powder?? [Re: sauce06]
okierifleman Offline
Bird Dog

Registered: 04/14/12
Posts: 384
Loc: Houston
I had very good luck with RL17 and 178 A Max. I just did my first round on the 208's with Retumbo and am pleased so far


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