Ready to load for 300 Win. Mag.

NYDAN

Handloader
Sep 17, 2013
1,250
222
The only problem is that the lead time on the Bartlein barrel is 8-10 months. Oh well, in the meantime we can decide which 7mmRM (left-handed Win. M70's) will get blue printed and the new barrel.

It was difficult finding brass, FL RCBS dies, a Redding Competition seating die, Hornady modified case, and bullets. I scoured the internet and local gun shops to find these items. One item here and one item there. Finally it all came together. Thank goodness the 300 Win. Mag. is NOT a popular deer hunting cartridge here in NY State. The powders and primers I had on hand from before the election. Every item I bought was the last one to be found.

I am hoping to develop a good 300 Win. Mag., 180 gr. AB load for elk hunting in 2022. I have heard that Reloder 22 works very well in the 300WM. I hope the RL-23 performs equally well. Any other suggestions for powder and bullets?

Dan

DSCN1133.JPG
 

Guy Miner

Master Loader
Apr 6, 2006
16,631
1,319
Reloader 22 was very good in the 300 Win Mag for me. The 7828 I tried worked well too. I liked the 180 & 200 gr bullets. Partitions.

Used some of the early 165 gr Ballistic Tips... Loaded them to about 3200 fps for a buddy... He literally blew the leg off a mule deer with that load! Those early B-Tips were pretty "soft" and expanded too readily at that velocity. Killed the deer, but wow... Lots of damage.

I've had a few 300's over the years and they all shot decently, one was picky and only liked 180 gr bullets at around 3,000 fps. That's not a bad thing if 180's are on hand - that combo is effective.

Felt like the 300 really came into its own when I started shooting 200 gr bullets from it. Velocity went down a bit, accuracy was great. That was quite a while ago though. I haven't had a 300 Win Mag in some years.

Looking forward to seeing your results posted here!

Regards, Guy
 

SJB358

Ballistician
Dec 24, 2006
31,355
655
I really like the 200 grain variety in the 300 Win. That kinda sets it apart from a 7mm in my eyes. R3, 7828,
Etc are all great, as is H4350. My brothers uses H4350 for 2960 with a 200 AB and took his bull at 675 this past fall.

I have a Krieger #2 .308 1-8 twist barrel I’d let go of if you wanted to start sooner.
 

sako2

Beginner
Jan 5, 2019
223
46
Dan you will like rl23 in the 300. Very clean burning. It's what i use with the 190gn ablr. Rl16 should do well to. You have a good selection of powders for the 300.
 

Electron

Beginner
Jan 21, 2019
62
0
No advice here but sure looks like something in what you've assembled should work. Good luck

Sent from my SM-A205U using Tapatalk
 

Guy Miner

Master Loader
Apr 6, 2006
16,631
1,319
SJB358":3b1owsw8 said:
I really like the 200 grain variety in the 300 Win. That kinda sets it apart from a 7mm in my eyes. R3, 7828,
Etc are all great, as is H4350. My brothers uses H4350 for 2960 with a 200 AB and took his bull at 675 this past fall.

I have a Krieger #2 .308 1-8 twist barrel I’d let go of if you wanted to start sooner.

Back in the ancient 1980's - I burned a fair bit of 4350 from a 300 Win Mag using 180 & 200 gr bullets. Worked well. No chronograph in those days, but it was accurate, flat shooting, and very effective the few times I was able to hunt with it.

Guy
 

JD338

Range Officer
Staff member
Nov 4, 2004
21,867
1,267
Dan,
RL22 and 180 gr bullets is a favorite of mine and many others. 75.0-75.5 grs will get you North of 3000 fps and we'll under MOA. I've done that in 3 different rifles and several others have had the same performance.

JD338
 

Elkman

Handloader
Apr 4, 2010
4,551
1
I have been loading the 300 WM for years. My most accurate load is 70 grains of H-4350 behind 180 Sierra flatbase. Best 3 shot group at 100 yards has been .131. For hunting i use the 180 Partition with a few more grains. You can get more velocity with other powders, but I haven't had any animals walk away from me, using the 4350.
 

gbflyer

Handloader
Mar 28, 2017
891
54
I too have had good accuracy with the 4350’s. Not the biggest producer of velocity but good consistency. I get 2850 out of 212eldx with my 30-338. Not quite the same case capacity but close.
 

NYDAN

Handloader
Sep 17, 2013
1,250
222
Thanks, everyone. I do have some H-4350. I am surprised no one is recommending the 4831 powders. Dan
 

SJB358

Ballistician
Dec 24, 2006
31,355
655
NYDAN":3qak3q6f said:
Thanks, everyone. I do have some H-4350. I am surprised no one is recommending the 4831 powders. Dan

H4831 would be my next choice. Like H4350, it isn't the fastest out there, but it'll get over 2800 with any 200+ bullet and over 2900 with anything 180.

Those two have been accurate and pretty easy powders to get working. 26, 23, 7828 and 25 are much speedier but they can be fussier as well. In todays world, I'd sacrifice 100 FPS for something I could have today.
 

diverdown

Handloader
Apr 29, 2015
460
69
As some of the fellas know I throated my Christensen Arms .300Mag so it will seat 180 grain Federal TB's out to 3.640. I went from IMR4831 and RL22 to RL26. Accuracy at 200 yards is under 1 inch. I've been lucky and haven't had any problems with RL26, it's very consistent. Hopefully this fall I'll know how it works on Elk.
 

270elk

Beginner
Aug 14, 2017
74
0
I have been using 74.8 grains of RL-22 and 180gr bullets which gives me around 3075 fps. The Kimber Classic select is very accurate with this load and consistently shoots sub-MOA. That's all I can ask for out of a hunting rifle.
 

gbflyer

Handloader
Mar 28, 2017
891
54
I’ve read the Re22 is touchy at higher temps. Anyone who has it should send it to me here in cool Alaska. [emoji1]
 

HodgemanAK

Beginner
Oct 23, 2020
197
79
I did just a work up with H4831/ 180AB in a buddy's 300WM.

Speeds were a little slow, but accuracy was there. I'm not one to exceed factory load data, but everything points to me seating the bullet long and giving it some more gas.

I really want to load up some H1000, but it's been as rare as unicorn tears up here for well over a year.

You also have Hybrid 100V- it's my preferred powder in the 300WSM- I got a 180AB to 2975 with single digit SD/ES and 3/4MOA.
 

PJGunner

Handloader
Dec 11, 2010
1,799
325
"Felt like the 300 really came into its own when I started shooting 200 gr bullets from it. Velocity went down a bit, accuracy was great."

That's been the case with me as well. I have four rifles in .300 Win. Mag. and every one shoots more accurately with 200 gr. bullet that any 180 gr. I've tried.
Paul B.
 

TXbaldhunter

Handloader
May 12, 2007
277
28
I like IMR4350 or Accurate4350 in the 300 Win Mag.Was messing with a couple of test loads with Hunter powder and I think it just may be one of the best powders for the 300 Win Mag.These are my test load targets.A little tweaking might tighten the groups up more.I used the 180gr Ballistic Tip in this load for a red stag and it was a DRT kill with complete penetration.
 

Attachments

  • ber 200.jpg
    ber 200.jpg
    89.2 KB · Views: 1,143
  • ber 180.jpg
    ber 180.jpg
    64.1 KB · Views: 1,143

baltz526

Handloader
Sep 25, 2005
1,074
8
180gr protected point Partition, 71-72gr H4350 is the load I have been killing Elk/Bear with for the last few freezers full. including the Elk we are eating right now. It also works well with the 180gr Ballistic tip, 180gr Speer hot core.
 
Top