Home Forums Reloading Big Game Rifles 300 WSM pet loads?

IMR4831 has worked best for me, giving the top velocities and best groups. At least in the Three 300WSM rifles I've loaded for so far.

Using WW Brass.

165gr Bullet - IMR4831 From 60.0 grains to 68.0 grains - Winchester WLR Primer



180gr Bullet - IMR4831 From 58.3 grains to 67.0 grains - Winchester WLR Primer

Junglejim
Ramshot hunter was the best powder that I had tried for my 300 WSM. Barnes 168gr TSX and 71gr of Ramshot Hunter gave 3130fps and 1/2 3 shot group.

180gr. TSX's, Norma brass, 215M's and an ample amount RL22.

A great cartridge that is most versatile and effective.

Dober, the 150 Horn's went 1.5" for two groups. Seating adjustments will probably tighten that up.

The ol' 150 PT's worked liked a charm. Don't laugh at the speed, it's all part of the plan brother(RapidZ reticle.....)

I've had my best results so far with RL 19 under the Nosler BT 168s and 180s for 3150 and 3000+ fps respectively.....sub moa for 3 shots .

I can't see why the 30wsm cartridge shoudn't safely and reliably get around 3000 fps with 180s , given the identical case capacity to the 300 H&H and also the pressure data I've seen . But H4350 ain't gonna get you there . That powder is about a perfect match for the 30/06 case ; and it's gonna be on the fast side for the WSM in my view .

I am looking forward to trying some RL17......

I load mine with 200 gr barnes tsx
WW cases and 60 gr of H4350
From my penetration tests I think it will shoot thru 2 bears...

Tested some loads today so far I like what I am seeing with Ramshot Hunter and 168 TTSX combo. But got to do some more testing. Here what I got yesterday.
Groups were 3 shots at 100 Yards.

64.0 = 1.435
65.0 = 1.940
66.0 = 2.115
67.0 = .510
68.0 = .790

Going to try a run of 67.0 thru 70.0 next week since pressure didn't seem to be an issue yet.

What surprised me yesterday was I tried some factory loaded 180 Winchester Power points in 300 WSM yesterday bolt lift was ranged from hard to very hard.

Sam what was the best velocity you could do with RL19 and the 180's??? My darn rifle likes the stuff so well in the accuracy department. I have a light load and a max load that shoot 180 hornady's and accubonds pretty good in my Kimber. I did get IMR4350 to shoot pretty good as well, but I never could get anywhere with N550.

Ramshot Hunter!

Jimmy, looking back at some poorly kept notes, the only load I could find showed 2950 for some 150 E-Tips(69.5 grs.). I don't believe I've ever shot it behind 180's.

Slightly over max book charges of R22 were always about 100 fps slower(low 2800's) with 180's than max charges of H4350.

Sam, I am pretty much sworn off RL22 as well but in a .270Win. I had a great load for my .270 with a max charge of RL22 behind a 130AB using Fed 210's, pretty accurate but folks here say that RL22 is temp sensitive, so I use H4831 behind a nosler 130grain solid base now, have not tried anything else with it cause I bought 250 of those nosler seconds. Too many guns, and not enough hunting season to use them all...

Jimmy, as to your R22 load that you went away from cause folks here say it's temp sensitive, what issues did you personally have with it?

Also in what states did you or do you hunt with it and what is their temp ranges?

I can't imagine you're only hunting your home state if you're concerned with this, right?

Thx
Dober

We've been known to have 80 degree temp changes here in OK from one day to the next. In fact we expect to hunt in chicken skins one day and T-shirts the next. A load that wasn't temp sensitive would be a good thing, even for a one state hunter like myself.

I'd spect that could happen but I'd be for bettin it's as rare as hens teeth...

Dober

80 degree temp changes in a day would probably be rare as hens teeth. Didn't mean that so literaly (kind of like I've told you a million times never to exaggerate) but we do see a wide varying temp during our deer gun season.

What kind of velocity are you getting with those loads.

I don't have the data on the velocities anymore- sent it along with the owners of the rifles.

One rifle, a MRC 1999 action got exceptional velocity, IMR4831 & 165gr Sierra's were darned near 3300fps. (IIRC)

The other two rifles using the same load combination were hovering right at 3200fps.

All three rifles shot sub MOA at 100 yds.

I'll see if I can get one of the fellows to weigh in here with exact figures for you.

Just put "Magic" in front of Desertsandman and you get the picture...this was when there wasn't a whole lot of stats on reloading .300wsm.

First Loads... shot at Sea Level about 40f Bulllet GK165gr Sierra shot in 2003

IMR4831 68.5grs 3220, 3234, & 3222 fps
IMR4831 69.0grs 3265, 3276, & 3305 fps. Best group < 1"
IMR4831 69.5grs 3267, 3250, & 3262 fps. DSMan and I agreed we reached ability of barrel to burn powder when more gave same or less fps.

Next batch shot on different Chrony at 6k feet in Nevada. Bullet GK165gr Sierra shot on 04/17/2004

IMR4831 69.5grs 3275, 3274, & 3270 fps. ES 5fps....group .472"

None of the load produced hard bolt.

This last set was shot with my broinlaw hurrying me up cause he was cold.

During this hurry up I also shot some 125gr prohunters. IMR4895 59.0gr for no speed (broinlaw had loaded up his chrony) I'm guessing 3250fps range and got a .501" group this was with a dirty barrel and felt good to know the .300wsm can handle light bullets!

DSM I'm still thanking you for your tutoring and can still see the smile on your face when you were writing down the results. Thanks again Bro.

As already mentioned:
64gr. H4350, 180 Partitions, Fed 215 with an OAL in my Montana at 2.850". This produces anywhere from 2935 - 2965fps. Great accuracy which is 1/2 - 3/4".

H4831, R-19 and R-22 struggled with 2850ish velocity.

Win brass, win primers, 66grs of H4350. 165gr Accubonds. Likes the bullet seated deeper. (picky little bitch) 2930fps. A little slower than I'd like but accuracy truimps speed for me anyday.

Next time out going 66.5