300 Win Mag loads


October 25, 2007, 09:31 PM
Anyone have any favorite loads for this caliber? I've never reloaded for anything other than my handguns, and have no idea what powder to get. Lets here some of your favorite loads:)

If you enjoyed reading about "300 Win Mag loads" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!
October 26, 2007, 09:43 AM
I have been using H4350 for .300 mag lately. It all depends on what bullet weight you are looking for. I like the mid-range 168 gr Barnes triple shock x-bullet for a hunting round, and H4350 will give you 2900+ fps at nominal loads (67 grains). Check the Hodgdon load data site to give you a good idea which powders give you decent velocities at reasonable pressures.

October 26, 2007, 11:49 AM
Thanks alohanole, My next question was bullet weight. Is one weight inherently more accurate, than another? Gotta be more than one guy that reloads for these:)

October 26, 2007, 12:45 PM
Is one weight inherently more accurate, than another?
Yes, but it usually depends on the likes and dislikes of the individual rifle used. You just have to work up loads with a variety of bullets to see.

I started loading for the 300WinMag in the mid 1960's and have developed loads for 150, 165, 180, and 200 gr bullets, and have harvested good numbers of deer, antelope and elk with each weight. I have settled on the 200 gr bullets for all around game shooting, as it maintains the best accuracy and energy and trajectory at ranges to 500 yards. I prefer the 200 Nosler Partition.

In the 60's there was a lot of surplus 4831 powder at rediculously low prices (around $0.25 a lb. in bulk IIRC) so thats what was used. My loads were later refined to use IMR4831.

Nowaday, if I were starting over, I would look at the Hodgdon powders H4831SC, IMR7828, Retumbo, and the Alliant RL19, RL22, RL25.

October 26, 2007, 04:26 PM
I have a 700 Rem Sendero in .300WM. Great rifle, sub 1/2 inch MOA with these loads (then I'll qualify them):

61 grains of IMR4350 behind a 200 grain Sierra Matchking BTHP (my rifle just loves the harmonics with this load combination, and although 61 grains is a very light load for the WM, it shoots the proverbial "1 raggedy hole" at 200 yards, no BS.

68 grains IMR4350 behind a 220 Sierra Matchking BTHP (the heaviest and longest bullet I load in .30 cal). I've gone up to 70 and 71 grains but 68 or 68.3 (preferred for accuracy) is what my rifle likes better.

65.5 grains IRM4350 behind a 168gr BTHP Matchking.

I use only Winchester Magnum Large Rifle primers, although I've recently had good luck with Federal Match primers and I'm thinking of trying of few of those if I can find a magnum version.

I've tried other powders.. many. Rather than flame Accurate 3100 and a few Hodgson powders - because some of the guys here may swear by them, I'll just punt and say I didn't have the time, patience or desire to waste Sierra bullets trying to dial in a load for them when 4350 was working so well for me. I also use 4350 for my .243, .308 and .30/06. Good stuff IMHO.

October 26, 2007, 05:54 PM
I have a Win Model 70. I use IMR 4350 with 'medium' range loads and I always use magnum primers. Regular primers seemed to work ok, but the groups were quite a bit smaller with the magnums. My gun likes 150 grain Nosler BT's (accuracy wise) and they have been VERY effective on small to average size deer.

180's shoot well, too, but for some reason, my gun does not like 165's.

Half the fun is experimenting to find the formula YOUR gun likes best.

October 26, 2007, 06:06 PM
Thanks for the loads, guys. I'm guessing this will be more of a paper puncher, as in lower Michigan where he hunts, is shotgun only. He bought this gun for a song, and refinished the stock, looks nice now. This ought to be fun dialing in a load.

November 1, 2007, 03:15 PM
JDGray, I reload lots of 300 WM, couple of faviortes, but they are written down at home, I'll right them down and post them tomorrow. One of the reasons I bought my 300 was the versitility of the .30 cal, so many to choose from!!!!

November 1, 2007, 05:07 PM
No mention of H1000? That and RL22 have done wonderful pushing a 168SMK.

November 1, 2007, 08:01 PM
If you don't already have a copy of Ken Waters' Pet Loads, you should

November 1, 2007, 08:32 PM
We picked up some Rem core lokt factory ammo, 180gr, and the gun grouped well with it, 3/4" at 100yrds. The gun store had the Rem bullets in bulk, so we picked them up along with a pound of IMR4350. Well shoot them this weekend, I loaded some at 65- 66 & 67gr, well see how my first rifle loads do:D

Getting stuck cases, out of the die, sucks:o:cuss: Thanks for all the help, guys.

November 3, 2007, 01:46 AM
you'll likely find 4350 to be too fast of a powder. if/when you are ready to try a different powder, reach straight for the rl-22.

November 9, 2007, 07:26 PM
you'll likely find 4350 to be too fast of a powder.

No kidding, we're all waiting to hear the follow-up post what his rifle ends up preferring the best.

November 10, 2007, 07:56 AM
Still havent made it to the range, I'll post our results, when we finally test them. My Stepdad said the same thing about being too fast, he reloads alot of rifle cartridges, but was phesant hunting out in SD, and wasnt home for guidence:D

November 10, 2007, 09:57 AM
180 gr Barnes Triple Shock, 63 gr IMR4895, 2950 fps with 24" barrel.

Charles S
November 11, 2007, 08:36 AM
I think you will find that the 300 Winchester is remarkably easy to load for. Some of my very first loads were with IMR 4350 and they were very accurate. One can achieve much better velocities with other powders.

My current favorite is Reloader 22.

I have settled on the 200 gr bullets for all around game shooting, as it maintains the best accuracy and energy and trajectory at ranges to 500 yards. I prefer the 200 Nosler Partition.

Agreed. However I also do the same thing with the 200 gr Sierra Gameking for deer.

I like just a hair over 72 grains of Reloader 22 with Winchester large rifle magnum primers. I am getting great velocity and great accuracy. This load hits like a truck.

November 12, 2007, 06:37 PM
Reloder 22 and a good 180 grain bullet = sub moa accuracy and ~3100 fps in my Rem 700.

November 13, 2007, 12:50 AM
Hey there ,
I've had the unpleasant opportunity to tune way too many .300 win. mags this year. I use AA 3100 CCI mag primers, and the Hornady 168 A-Max. Good for 1/2" at 100 meters. In most the guns this year. Some like the 70.0 gr loads some a little more. But it's a good place to start. I know that this is a target bullet but these guys are killing deer right and left with them. All reports so far have been one shot kills at all different ranges.
These things seem to be more accurate when down loaded slightly.
Probably got more to do with recoil and noise then any thing, non the less thye all shot around 1/2" or better. My own .300 wm. shots the same.
I use that same powder im my .270s also. works very well. They all shot 1/2" to 3/4" at 100.
One thing I will say thats already been said. The .300wm can be bullet fussy.

December 1, 2007, 05:14 PM
It was too cold and windy today to go shooting, and snowing like mad, so my brother wants to go out and shoot:scrutiny:. The 67gr load did the best,about 1'' group at 100yrds. All loads did print lower than the Factory Rem. I will load up some more at 67, and run them over a chronograph to see where were at. I did have two rounds that didn't fire, after running them through again, they fired, very strange because the primer hits were good.:confused: Next time out I'll get some chrono info, for now I'm just happy that my fingers are starting to thaw:)

December 1, 2007, 07:49 PM
Try seating your primers with a little more force. The first strike probably finished seating it, and the second one set it off. My Contender has light strikes and I have to make sure and lean a little on the press handle to get them seated well enough to light every time

If you enjoyed reading about "300 Win Mag loads" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!