Favorite .300 RUM loads

elkguide

WKR
Joined
Jan 26, 2016
Messages
4,606
Location
Vermont
Would love to hear some of you guys favorite .300 RUM loads especially if any of you are loading with N570.

I am a died in the wool .300 Win Mag fan boy but picked up a Christensen Arms Custom in .300 Rum. Haven't settled on a bullet weight and since I'm all ready a .30 caliber fanboy, I have a large selection of bullets to work with so what works best for you? I also finally just lucked into 5 pounds of N570, after a long wait, so would be interested in your feelings about using it as well.
I'll use this rifle on whitetails, mulies and elk.
 

Yote Klr

FNG
Joined
Jul 8, 2019
Messages
66
Location
Indiana
I retired my last 300rum barrel on 200gr Accubonds and RL33.

Just rebarreled and the new pipe is running on N570 and 230gr OTM and GM215M primers, 3130 fps 26" 10 twist barrel.
 

Hmr

Lil-Rokslider
Joined
Jun 7, 2015
Messages
110
Running 92 gr of Retumbo with 215 gr VLD’s, GM215M primers and Nosler brass. 26” pipe with 1-10” twist and bullets seated to 3.695” just enough to feed from my HS mag.
 

nhyrum

Lil-Rokslider
Joined
Apr 29, 2019
Messages
174
Location
Wyoming
I just got a rum as well. I'm looking at imr 8133, retumbo and maybe rl33, looking to shoot 230 Berger's or maybe the 230/250 a tip. If I'm feeling saucy, I might run cutting edge

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freebird

WKR
Joined
Nov 15, 2015
Messages
321
Location
SW Idaho
Wow, I'm running a 30" barrel with a 1-8 twist, using 91.5gr of N570 and only getting 3180fps with 215 berger's.
 

Can17

FNG
Joined
Jun 16, 2019
Messages
2
My load is a 230 Hybrid Target, 89.5 gr N570, CCI250. Bullet seated with a .020" jump.
Velocity is 3060fps out of a 27" 9 twist. I loaded up to 91 gr before I started seeing pressure but this load gave me the lowest E.S. and tightest group.

FWIW, I also tried 8133, Retumbo, and RL33.
8133 was the slowest of these powders (started getting sticky bolt lift at around 3000fps)
RL33 and N570 ran neck and neck velocity wise, but I got the most consistent velocity with 570....
 

SOIHUNT

Lil-Rokslider
Joined
Jul 15, 2019
Messages
105
I’m running 215’s and 3.68 90.5gr. Retumbo 300 rum Ridgeline rifle... 200 yds. .41 inches
 

well_known_rokslider

Lil-Rokslider
Joined
Oct 8, 2019
Messages
154
Location
Overthasaddle, Idaho
212gn Hornady ELD-X, 89.6gn of Reloader 25 with Federal GMM magnum primers. I will say, however that after taking my first bull at 60 yards this year, I will likely be looking for a new bullet. The ELD-X absolutely disintegrated on the frontal shot at just under 3000fps. I'm sure it would fare better at longer ranges but I'm not sure I'm willing to risk it.
 

Huntin wv

Lil-Rokslider
Joined
Dec 14, 2015
Messages
213
Location
West Virginia
165 gr nosler accubond, 95.5 grains of RL25, CCI 250 primer. Bullet seated .020 off the lands. 3400 FPS out of a Remington sendero. Shoots .5-.75 moa


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well_known_rokslider

Lil-Rokslider
Joined
Oct 8, 2019
Messages
154
Location
Overthasaddle, Idaho
165 gr nosler accubond, 95.5 grains of RL25, CCI 250 primer. Bullet seated .020 off the lands. 3400 FPS out of a Remington sendero. Shoots .5-.75 moa


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Are you loading rounds into the gun individually? There is no way a bullet seated that close to the lands would fit in my Remington magazine.


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Yote Klr

FNG
Joined
Jul 8, 2019
Messages
66
Location
Indiana
Are you loading rounds into the gun individually? There is no way a bullet seated that close to the lands would fit in my Remington magazine.


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If you want you can get a Wyatt's mbe-3 magazine box, they're ony about $35. They're advertised at 3.825" but mine measured 3.840".
They're on sale at Redhawk rifles for $26.

.https://www.google.com/amp/s/redhawkrifles.com/amp/wyatts-extended-magazine-boxes/
 

Sridge

FNG
Joined
Nov 19, 2019
Messages
20
I put a wyatt's box in my 700 action, let's you seat out quite a bit further. My load is 200 gr eldx with 94 gr of Retumbo @ 3280. I've also had good luck with 200 gr partitions with 87.5 gr of 7828.
 

nhyrum

Lil-Rokslider
Joined
Apr 29, 2019
Messages
174
Location
Wyoming
I've got some 230 Berger's and 230 a tips I'm working on with rl33. I'm not very motivated to shoot load work when it's below zero

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Huntin wv

Lil-Rokslider
Joined
Dec 14, 2015
Messages
213
Location
West Virginia
Are you loading rounds into the gun individually? There is no way a bullet seated that close to the lands would fit in my Remington magazine.


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Yes one at a time usually. I can get one in the magazine but the tip of the bullet is over the feed ramp and when fired the recoil causes the feed ramp to impact the ballistic tip of the round in the magazine and deforms it.


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well_known_rokslider

Lil-Rokslider
Joined
Oct 8, 2019
Messages
154
Location
Overthasaddle, Idaho
Yup that’s what I was worried about. Not ideal. I’m not sure I want the time liability of single loading when I’m out west with an $800 tag. Still good info!


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Huntin wv

Lil-Rokslider
Joined
Dec 14, 2015
Messages
213
Location
West Virginia
No. Not ideal. I haven’t had a problem with it yet, but know it’s a possibility. I’ve hunted mule deer out west with it a few times and whitetail once. I have killed a pile of whitetails with it in the East. I haven’t tried seating them deeper. That’s where I started and found good accuracy and haven’t messed with it since. I don’t reload and shoot near as much as I used to. More focused on archery these days.


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PA Hunter

WKR
Joined
Dec 29, 2018
Messages
582
Location
Bethlehem Pennsylvania
I load for five different .300 rums and I only load 200 gr Accubonds either 91.5 gr RL-25 or 95 gr Retumbo both shoot great getting 3175 FPS Retumbo ADG brass Fed primers. I also played with RL 33 and had good accuracy.

I load for 2 different Fierce
2 different Rem 700 CDLs.
1 Remington Sendero.

All shoot great been reloading the Sendero since 1996 or so.
 
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