Load for 6.5 RPM

[Husky user]

Thought I would throw this out to see if it fly's
I have a 6.5RPM Weatherby.
Also have a lb of H4831 that I have no use for.
Would like to load up a box of 120 gr Sierra Pro Hunter for shooting steel at 300-400 yds
Can't find any data.
Could not download Quickload (Bill G said it was dangerous site)
Anybody have any ideas what a starting load would be.

 

[Raudy707]

My buddy was shooting 65 grains of Retumbo under a 147 eld m. 63-66 grains should do pretty good under a 120. He uses slower powders like 7828 ssc and H1000 but I'll ask him if he's ever tried 4831. Good luck.

 

[SPitty]

I checked Hodgdon's site and that combination is not listed.

Reloading Data Center

www.hodgdonreloading.com

 

[Husky user]

I could not find any data for 4831,but took 264 Win Mag data and back it way down.
Going to start with 55gr and go up 1/2 gr at a time.
Will crono each shot .
Hope to get around 3200fps

 

[just_jon]

Maybe this will help you get started.

 

[just_jon]

Just noticed I had barrel length at 18" from a previous search. Revised to 24"

 

[Husky user]

Thanks ,its pretty obvious H4831 is not the best powder for the RPM.
But it works pretty good in 7 Mag so it can't be too bad.
I can get 3100 with 142 Acubond LR and RL25
Do you think 55 gr is too light.?
I have read that you can get too light with slow powder>

 

[just_jon]

Cartridge : 6.5 Weatherby RPM
Bullet : .264, 120, Sierra SP 1720 G7 Litz
Useable Case Capaci: 79.710 grain H2O = 5.176 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H4831 *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 88 62.55 2961 2337 46917 13739 96.3 1.295
-09.0 89 63.25 2994 2389 48426 13895 96.7 1.276
-08.0 90 63.94 3027 2441 49981 14047 97.1 1.257
-07.0 91 64.64 3059 2493 51586 14193 97.5 1.238
-06.0 91 65.33 3091 2546 53240 14335 97.8 1.219
-05.0 92 66.03 3124 2600 54946 14471 98.2 1.201
-04.0 93 66.72 3156 2654 56705 14601 98.4 1.183 ! Near Maximum !
-03.0 94 67.42 3188 2709 58520 14726 98.7 1.166 ! Near Maximum !
-02.0 95 68.11 3221 2764 60392 14845 99.0 1.149 ! Near Maximum !
-01.0 96 68.81 3253 2819 62323 14959 99.2 1.132 ! Near Maximum !
+00.0 97 69.50 3285 2875 64317 15066 99.4 1.116 !DANGEROUS LOAD-DO NOT USE!
+01.0 98 70.20 3317 2931 66375 15166 99.6 1.099 !DANGEROUS LOAD-DO NOT USE!
+02.0 99 70.89 3348 2988 68499 15261 99.7 1.083 !DANGEROUS LOAD-DO NOT USE!
+03.0 100 71.59 3380 3045 70692 15348 99.8 1.068 !DANGEROUS LOAD-DO NOT USE!
+04.0 101 72.28 3412 3102 72956 15429 99.9 1.052 !DANGEROUS LOAD-DO NOT USE!
+05.0 102 72.98 3443 3159 75296 15503 100.0 1.037 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 97 69.50 3419 3115 75446 14683 100.0 1.037 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 97 69.50 3098 2557 53250 14774 94.8 1.217

 

[OldElkHunter1961]

There is a reason you can't find load data for H4831 in the 6.5 RPM. It's the same reason you can't find load data for FFF black powder in the 6.5 RPM. It is ill suited to the task. Both Retumbo and H1000 are starting to show up on shelves. They are suitable choices for the 6.5 RPM. The best I've found is Alliant Reloader 25. Which, like all numbers in the reloader series, is no where to be found. Be careful. I'd hate to see a perfectly good Mark V damaged.

 

[Husky user]

I

There is a reason you can't find load data for H4831 in the 6.5 RPM. It's the same reason you can't find load data for FFF black powder in the 6.5 RPM. It is ill suited to the task. Both Retumbo and H1000 are starting to show up on shelves. They are suitable choices for the 6.5 RPM. The best I've found is Alliant Reloader 25. Which, like all numbers in the reloader series, is no where to be found. Be careful. I'd hate to see a perfectly good Mark V damaged.

I realize its not be best powder for the RPM,but its listed as a usable powder for the 264 Win Mag.which is very similar.
I have no intention of loading anywhere near max loads,just want to make plinking loads.
I have some RL25 and a whole lbs of RL 26,just don't want to waste them.
Also have 100 bullets that are just laying around.

 

[CMP70306]

There is a reason you can't find load data for H4831 in the 6.5 RPM. It's the same reason you can't find load data for FFF black powder in the 6.5 RPM. It is ill suited to the task. Both Retumbo and H1000 are starting to show up on shelves. They are suitable choices for the 6.5 RPM. The best I've found is Alliant Reloader 25. Which, like all numbers in the reloader series, is no where to be found. Be careful. I'd hate to see a perfectly good Mark V damaged.

Not necessarily the case, the .264 win mag has almost the same case capacity and has plenty of load data for H4831 and other powders in the same general burn rate. It's more likely the powder manufactures haven't gotten to testing old powders and are focusing on the new stuff instead.

 

[Don Spence]

There is a reason you can't find load data for H4831 in the 6.5 RPM. It's the same reason you can't find load data for FFF black powder in the 6.5 RPM. It is ill suited to the task. Both Retumbo and H1000 are starting to show up on shelves. They are suitable choices for the 6.5 RPM. The best I've found is Alliant Reloader 25. Which, like all numbers in the reloader series, is no where to be found. Be careful. I'd hate to see a perfectly good Mark V damaged.

R26 works better

 

[PatriotHenry]

Chiming in on this old thread to ask if anyone has some load data now for 140-156 class projos with H1000, RE26, and Retumbo?
Helping a friend. Looks like case capacity is very close to the .264WM.

Thank you,

PH

 

[sable tireur]

Here is a reference list of loads for the RPM:

https://shootersreference.com/reloadingdata/65-weatherby-rebated-precision-magnum/