Home Forums Reloading Big Game Rifles Good .300 RUM loads

I currently have .308 caliber 150 grain ballistic tips, 165 grain ballistic tips, 178 grain a-max's, and 208 grain a-max's. Anybody have real accurate loads with these or similar bullets? If not other loads will still be appreciated. The rifle these loads may possibly be fired out of is a Remington 700 Sendero SF II. Thanks!

92 gr rl 25, rem case, 200 gr nosler accubond, Fed 215M, OAL--as long as your magazine allows; probably around 3.650 or a little longer. Work up to this load as it may be too hot for some guns and also because RL 25 can vary in burning rate from one lot to the next. Velocity is usually around 3150. If that don't turn your crank you can keep all things the same except work up to 94 or 95 gr of Retumbo instead of RL 25. Some have great luck with this powder. Great hunting bullet, great BC, and its pretty much as tough as a partition. Just be sure to work up from lower levels as each gun is different.

I run ramshot magnum 95 gr. with 200 gr. Nosler partitions. This is max in Noslers manual. Goes 3100 fps. I did load some 165 sst bullets with reloader 25. I will have to find the load info and get back to you.

I run 96.0 gr of RL 25 with 180 grain partition or accubond. average velocity of 3347 from my 26 inch barrel sako.
Dink

.300 Remington Ultra Mag Page 1.

Bullet Load Powder O. A. L. Velocity Energy Comments

130gn Barnes TTSX 96gn* H 4831sc 3452 3 touching - .2 Mild
98gn* H 4831sc 3555 3649 Shoots into above, tight!
97gn Rel 22
98gn* Rel 22 3679 3908 Shoots into above - Warm load

150gn Sirocco Remington 3.569" 3582 4275 Hot Loads, loose primers + plunger marks
Factory* Factory cases -.545", fired =.549"

150gn Part Gold 98gn AR 2213 3.640" 3557 4215 same powder as H 4831
96gn WMR 3479 4032 powder discontinued
96gn Rel 22 3606 4332

150gn Nosler SB 97gn AR2213sc 3.618" 3468 4007 same powder as H 4831sc
97gn IMR 7828 3487 4051
99gn AR 2217 3323 3679 same powder as H 1000

165gn Barnes XBT 94gn AR 2213 3.631" 3407 4254 same powder as H 4831
96gn AR 2213 3467 4405

165gn Woodleigh 102gn AR 2217 3.568" 3442 4342 Extremely Accurate @ .400"

168gn Barnes TSX 97gn* Retumbo 3.570" 3314 4099 Warm
101gn* Retumbo 3522 4629 Hot
102gn* Retumbo 3593 4817 Too Hot
95gn* Rel 25 3264 3975 Mild

180gn Barnes TSX 94gn* Retumbo 3240 4197 Good Load
96gn* Retumbo 3360 Hot
94gn* Rel 25 3226 4161 .437" Mild

180gn Barnes XBT 88gn Rel 22 3.631" 3140 3942
92gn AR 2213 3270 4275

180gn Woodleigh 101gn AR 2217 3.568" 3377 4559 Extremely Accurate @ .507"
96gn* H1000

180gn Nosler Part. 92gn AR 2213sc 3.618" 3238 4192
Remington Factory 3357 4505 Top Velocity
92gn IMR 7828 3232 4176

190gn Hornady BT 90gn IMR 7828 3.616" 3105 4068 Mild Load

200gn Accubond 94gn* H1000 3084 4225 Shooting into 130 TTSX group - perfect.
94gn* Retumbo 3164 4447 Sighted - .5 MOA load but top end.
85gn* Rel 22
87gn* Rel 22 3167 too hot - 85gn MAX.
93gn* Rel 25

.300 Remington Ultra Mag Page 2.

Bullet Load Powder O. A. L. Velocity Energy Comments

200gn Nosler Part 94gn* H1000 3120 4324 Shoots into 130gn TTSX Group
92gn* Retumbo
93gn* Retumbo 3147 4400 Too Hot - Sticky Extraction
85gn* Rel 22
93gn* Rel 25
90gn IMR 7828 3.607" 3090 4241 Mild load, MOA

200gn Speer SP 86gn WMR 3.645" 2973 3926
88gn Rel 22 3.630" 3163 4444

220gn Woodleigh 90gn* Retumbo
91gn* H1000
91gn* Rel 25

220gn Sierra RN 80gn WMR 3.557" 2716 3604
86gn Rel 22 2876 4042

NOTE: Loads marked with *asterisk, were fired in Winchester Model 70 Stainless. All other data chronographed in 2
separate Remington 700 stainless rifles. Oehler 35P Chronograph used for all load development.


JW

I've ran:

150IB's over 95grs of R-22 for 3650fps
168TTSX's over 100grs Retumbo for 3450fps
180NAB's over 97grs Retumbo for 3375fps

All had good accuracy but the 180's are my main longish elk load...

Work up to these charges in your rifle

100gr Retumbo, Rem brass. CCI mag primers,180 gr barnes TSX.

I think that Retumbo and 200gr Accubonds were made to shoot in the 300 RUM. This combo has shot great for me in a couple different 300 RUM's...............................DJ

There are relatively few cartridges that ever come along where a bullet and powder combination is deemed so perfectly matched by the majority of users. The .300 RUM with the aforementioned components is one such cartridge combo.

You will see from my own notes that I too favored this very combo. We may vary a grain or so by rifle to rifle, but the Retumbo / 200gn Accubond is a superb hunting rifle combination capable and suitable to all, save a very few animals, interationally.

JW

The best load I've found for my 300 RUM is 95.5 gr of Retumbo and a 200 gr accubond.

I'm tryin to fight the urge to run 200's...

. Couldn't agree more

200 grain Accubonds, and a stiff charge of Retumbo or RL-25, whichever works best. mtmuley

RE 25 and 200 gr. Accubonds were my favorite.. Plus the same powder and 150 gr. BTBT for coyotes..

180 Nosler Partitions and 97 grains of Retumbo

. I couldn't Agee more, just 95.6 in mine

I am bringing back this thread as I have a couple questions for you guys shooting 200 accubonds and retumbo...I took out my buddies 300 RUM that I am doing load work for and shot today to break her in. I only loaded H1000 today as it seems to have some good recommendations. I didn't play much with seating depths, just loaded to max length that would still fit and feed in magazine (3.650) and loaded rounds at 90, 90.5, 91, 91.5....The 90 grain group produced a .94" group at a 3070 FPS average....The rest of the loads all opened up and averaged 1.5-2.5" maxing out at 3200 FPS....Need to do better than this considering the quality of rifle, optics, componets, ect.

Sooooo....it seems Retumbo and the 200 grain accubonds are very popular and successful combo for many. My question is were do I start? The Nosler manual 8 shows a max load of 91.5 grains at 3070 FPS (24" barrel)...Yet many are saying loadings in the 94-95.6 grains are there go to loads....Is the manual a little to cautious? Are these 94-95 grain loads super hot?

My goal is to have the 200 grain accubonds shooting tight clusters in the 3100 FPS range - I would be happy with that at with a 26" tube - shouldn't be too much hassel. On a side note, I do believe the rifle has a pretty standard if not touch tight chamber as the rifle was showing slight pressure at 91.5 of H1000 and the nosler max shows 92????

If I were you I would start pretty light and just watch the velocities on the Chronograph. I would be very careful of velocities much over 3100fps with 200gr bullets. If you find a load in the 3050-3100 range that shoots well it would be golden. If I were shooting that same rifle again with a new lot of Retumbo I would do the same and rework up the load. over 9yrs powder lots can vary. My new lots of H1000 are giving me much better velocities than before as just one example.........

What brass are you using? Brass capacity varies quit a bit between the available 300 rum brass(Hornady has 3 grains more capacity than Norma for instance).
Hornady has the most capacity and is the best for the 300 rum followed by Remington, which hasnt been made in over a decade.

I'm running new Norma Brass...Picked up 75 pieces from sportsmans so that is all I will have access to.