Whats the best powder for the 300 win mag, shooting 165 and 180 grain bullets.

I have H-4831, RL 22, and IMR-7828.

Thanks

I've always used H-4831

Nothing wrong with H4831.

However I prefer to compress just a touch and either go with 7828 or RL22.

In theory H4831 would leave 75-100fps velocity potential on the table compared to the other 2.

Many don't care for RL22 but it is my starting powder for normal magnums.

I've had my best accuracy in 3 different .300 WM's with H-4831.

RL-22 seems to give a slight edge in velocity but I couldn't obtain the same level of accuracy.

Since I hunt in extreme cold in Montana I've found 4831 to be pretty temperature insensitive and I've never had to re-zero when coming from the milder East Coast.

Actually, you've got 3 good powders for the 300 WM w/165 or 180 bullets when all's considered. Boils down to which load combo your Boomer prefers although I bet you could find something with each powder that would be a good, solid load.

I prefer H-4831 in original or H-4831sc; either one floats my boat for 300 WM with 165 & 180 grainers (and other cartridges, too, 257 Weatherby Mag, 270 Win, 300 Witherbee, 25-06 Rem).

Accuracy in all above is absolutely spectacular; the velocities pretty much confirm what the manuals state +/- a coupla fps with any given cartridge/bullet combo.

H4831SC works well in mine, though RL22 was also good. Would load up a few test loads of each and see how they compare on paper and go from there.

I would use 4831 if that what I had. My best experience has been with IMR 4350.......


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Got my load from an old gunsmith in Seguin. H4831 w/ 165g NP. Shoots very well. He had loads for many cartridges and I got a copy. He used H4831 for most magnums. All that I have tried worked well.

I'm using IMR7828 with 180 gr TSX bullets and Ramshot Hunter with 145 gr CEB ESP Raptors.

The original surplus 4831 was hard to beat, but my luck hasn't been nearly as good with the current Australian-made version. IMR-7828 is just a tad slower and has been more consistent for me.

I use RL-25 with 180 grain bullets, where it yields velocities higher than any of the faster powders. However, any particular rifle is likely to do fine with any of the powders you name.

My M70 really likes Rel 22 pushing 180gr Swift A Frames.

I have shot a .300 Winny since 1973 and tried all powders and bullets sold since then. H-4831 and IMR-7828 were the choices until RL-22 came along, since then it has taken the day. 180 grain Nosler Partition and North Forks are the bullets, 76 grains of powder and Fed 210M is the primer that 8 out of 15 hunters will be loaded with when we hunt Colorado in November. It has been our go to load for many years. All shoot Model 70 Winchesters with or without the Boss. Good shooting.

Vit 560.Put that behind a 180 TSX and your are set.I wish I took a photo of the 200yds,five shot one hole group I shot with this load and bullet once.Use Lapua cases-very important!

I have had good success with H1000, although I actually tried very few powders before settling on a load. 180 grain bullets fly true out of my rifle with this powder.

Modern slow burning powders work great in the 300 WinMAG. I like 83 grs of Re25 with 180 Accubonds. Other good ones are...

Vihtavuori N570, Hodgdon Retumbo, Norma MRP-2 or MRP, Ramshot Magnum (Big Boy), Vihtavuori N560, Accurate MAGPRO, IMR 7828, Alliant Reloder-22, H1000, H870, Win 780...etc.

quote:

Originally posted by Ackley Improved User:
Modern slow burning powders work great in the 300 WinMAG. I like 83 grs of Re25 with 180 Accubonds.

AIU: I usually don't mention the exact powder charge I use since some people may take it as gospel and assume it will be safe in their rifle. I also use RE 25 with the 180 Accubond, but my rifle tops out at 81 grains yielding 3085 FPS from a 24.4" barrel. Just wanted to mention this so that someone won't think that the 83 grains you use (which is probably just fine in your rifle) will necessarily be okay in theirs.

BTW: RE-25, like RE-22, does tend to vary in burning speed from lot to lot somewhat more than other powders, which could be the source of the difference in our loads. However, RE-25 (all of which I've used is from one 5-lb jug) has provided both the best velocity and the best accuracy from my .300 WIN.

Stonecreek, I agree with everything you say - your cautionary comments are spot on. 83 grs of Re25 is hot - even in my rifle - and should be approached from below, while checking closely for excessive PSI signs. I shoot this load only a few times a year, only use new cases, and stop when the elk is in the dirt. Regards, AIU

I too use RE25 in my 300, my load consists of fully prepped Remington brass, Fed215 primers and Nosler 180gr Accubonds with 81gr's of RE25. I get an average velocity of 3166fps in my 26" barreled Kimber 8400.

Of the powders you mention, I would probably choose 7828 for 180's and H4831 for 165's.

Cheers.

Our family has 3 .300Win Mag shooters and we all use H4831 and the 180g. bullets.

Nosler is the preferred brand for the bullets with choices from Ballistic Tips to Accubond without any noticeable difference in performance on the critters.

We've used those loads for long range mule deer and long range elk and a couple of trips to Alaska for black bear. Worked in all situations.

My next choice would be the RL-22 but try both in a 180 bullet and see which one produces the best groups for your rifle.