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Load data for .375 Rem. Ultra Mag + .375 | 256gr | Hammer Stone Hammer

Recommended Powder(s):

.375 Rem. Ultra Mag + .375 | 256gr | Hammer Stone Hammer

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:
.375 | 256gr | Hammer Stone Hammer
Manufacturer SKU:
37256SH
Bullet Weight:
256gr | 16.6g
Bullet Diameter:
0.375" | 9.52mm
Bullet Length:
<<locked>>
Caliber:
.375 Rem. Ultra Mag load data
Case Length (l3):
2.850" | 72.4mm
Cartridge Length (C.O.L.):
<<locked>>
Seated Depth:
<<locked>>
Shank Seated Depth:
<<locked>>
Case Capacity:
117.0 Grains of Water | 7.60 cm³
Primer Size:
Large Rifle Magnum (LRM)
Max. allowed Pressure:
63817 psi | 4400 bar
LID:
LID_B12484_C557
Last updated:
2026-07-07

Load data for 218 loads in caliber .375 Rem. Ultra Mag with .375 | 256gr | Hammer Stone Hammer bullet and 109 powder(s). The key underlying parameters are shown in the table above.

  • Important Notice: DO NOT go below Minimum Charge or above Maximum Charge unless there are reasons. Since xxlreloading.com has no control over the equipment and components used by the customer and the data used in connection with the website, any responsibility and liability for the results achieved is rejected. Also see our Terms of Service

    Questions regarding the load data: Please read the information in the next tab "Explanations".

  • No data yet

  • We recommend you limit powder range to relevant brands to speed up re-calculation of results

    Use the Personalized Load Calculator to customize loads to your own specific requirements. Find more details in the help section.

    Our default view only displays powders/loads that fulfill certain criteria: Max pressure of a load <=90% of Max. Standardized Pressure. Fill Rate (Min FR): >80% and <100% for rife loads,  >60% and <100% for pistol loads. Min. Propellant Combustion (Min z): >90% for rifle loads , >80% for pistol/revolver loads. Relax these criteria at your own risk to potentially get more powders shown in the load tables.

    .

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Click on the desired row in the tables below to add a specific load / powder to your Diary and manage there.

Powder
Charge
FR
MaxP
%
V(0)
z
ADI AR 2206H
<<locked>>
85%
57246
90%
**49
100%
ADI AR 2208
<<locked>>
91%
57435
90%
**40
100%
ADI AR 2209
<<locked>>
97%
47863
75%
**67
95%
ADI Benchmark 8208
<<locked>>
84%
57130
90%
**23
100%
Accurate 2495
<<locked>>
87%
57406
90%
**77
100%
Accurate 2700
<<locked>>
88%
57392
90%
**00
98%
Accurate 3100
<<locked>>
97%
40843
64%
**26
96%
Accurate 4064
<<locked>>
89%
57000
89%
**17
100%
Accurate 4350 👍
<<locked>>
97%
56608
89%
**99
100%
Alliant AR-Comp
<<locked>>
83%
56898
89%
**71
100%
Alliant Power Pro 2000-MR
<<locked>>
87%
57261
90%
**71
100%
Alliant Reloder- TS 15.5
<<locked>>
91%
57203
90%
**53
100%
Alliant Reloder-15
<<locked>>
88%
56942
89%
**69
100%
Alliant Reloder-16 👍
<<locked>>
97%
54027
85%
**99
100%
Alliant Reloder-17
<<locked>>
94%
56985
89%
**58
100%
Alliant Reloder-19
<<locked>>
97%
46978
74%
**57
95%
[Alliant Reloder-22]*
<<locked>>
97%
41220
65%
**85
93%
Alliant Reloder-23
<<locked>>
97%
38827
61%
**52
99%
[Alliant Reloder-25]*
<<locked>>
97%
34330
54%
**48
94%
Alliant Reloder-26
<<locked>>
97%
43482
68%
**03
99%
Baschieri & Pellagri 107
<<locked>>
85%
57217
90%
**69
100%
[Bofors RP15]*
<<locked>>
97%
38058
60%
**16
92%
Bofors RP3
<<locked>>
90%
56942
89%
**59
100%
[Bofors RP5]*
<<locked>>
97%
41220
65%
**85
93%
Bofors RP7
<<locked>>
94%
57406
90%
**43
98%
Hodgdon BL-C2
<<locked>>
84%
57029
89%
**53
100%
Hodgdon Benchmark
<<locked>>
83%
56942
89%
**77
100%
Hodgdon H380
<<locked>>
89%
56753
89%
**59
100%
Hodgdon H414
<<locked>>
96%
57203
90%
**15
99%
Hodgdon H4350
<<locked>>
93%
56710
89%
**66
98%
[Hodgdon H4831]*
<<locked>>
97%
45730
72%
**98
92%
[Hodgdon H4831 SC]*
<<locked>>
97%
45078
71%
**79
92%
Hodgdon H4895
<<locked>>
85%
57305
90%
**56
100%
Hodgdon Hybrid 100V
<<locked>>
97%
50778
80%
**87
100%
Hodgdon LEVERevolution
<<locked>>
87%
57101
89%
**89
100%
Hodgdon Superformance
<<locked>>
95%
57043
89%
**41
99%
Hodgdon TrailBoss
<<locked>>
97%
34316
54%
**60
100%
Hodgdon VARGET
<<locked>>
86%
57145
90%
**43
100%
IMR 3031
<<locked>>
85%
56985
89%
**30
100%
IMR 4064
<<locked>>
89%
56869
89%
**30
100%
IMR 4166 Enduron
<<locked>>
87%
57217
90%
**13
99%
IMR 4350
<<locked>>
97%
55347
87%
**26
98%
IMR 4451 Enduron
<<locked>>
93%
57334
90%
**46
99%
IMR 4831
<<locked>>
97%
53447
84%
**40
100%
IMR 4895
<<locked>>
87%
57043
89%
**76
100%
[IMR 4955 Enduron]*
<<locked>>
97%
47877
75%
**05
93%
IMR 8208 XBR
<<locked>>
84%
57130
90%
**23
100%
Lovex D073.6
<<locked>>
85%
56855
89%
**23
100%
Lovex S060
<<locked>>
86%
57159
90%
**90
100%
Lovex S062
<<locked>>
89%
57435
90%
**30
100%
Lovex S065
<<locked>>
95%
56942
89%
**40
99%
Lovex S070
<<locked>>
97%
57246
90%
**66
99%
[Lovex S071]*
<<locked>>
97%
33939
53%
**85
94%
Norma 201
<<locked>>
86%
57305
90%
**20
100%
Norma 202
<<locked>>
86%
57421
90%
**10
100%
Norma 203B
<<locked>>
89%
57334
90%
**72
100%
Norma 204
<<locked>>
97%
55912
88%
**72
97%
Norma MRP
<<locked>>
97%
43265
68%
**61
96%
Norma URP 👍
<<locked>>
97%
55477
87%
**82
100%
Ramshot Big Game
<<locked>>
88%
57087
89%
**82
100%
Ramshot Hunter
<<locked>>
97%
54331
85%
**79
99%
Ramshot TAC
<<locked>>
84%
57174
90%
**36
100%
Ramshot Wild Boar
<<locked>>
84%
57130
90%
**56
100%
ReloadSwiss RS 14
<<locked>>
96%
34650
54%
**96
100%
ReloadSwiss RS 50
<<locked>>
90%
57377
90%
**43
99%
ReloadSwiss RS 52
<<locked>>
86%
56942
89%
**18
100%
ReloadSwiss RS 60
<<locked>>
92%
57435
90%
**64
100%
ReloadSwiss RS 62 👍
<<locked>>
97%
56855
89%
**25
100%
ReloadSwiss RS 70
<<locked>>
97%
56115
88%
**51
100%
Rottweil R 901
<<locked>>
84%
57435
90%
**87
100%
Rottweil R 902
<<locked>>
88%
57348
90%
**13
100%
Rottweil R 903
<<locked>>
92%
57130
90%
**56
100%
[Rottweil R 904]*
<<locked>>
97%
49792
78%
**44
94%
Rottweil R 905
<<locked>>
97%
45876
72%
**41
95%
Rottweil R 907
<<locked>>
94%
57406
90%
**43
98%
SNPE Vectan SP 11
<<locked>>
91%
56884
89%
**82
100%
SNPE Vectan SP 7
<<locked>>
84%
56811
89%
**30
100%
SNPE Vectan SP 9
<<locked>>
86%
56913
89%
**46
100%
SNPE Vectan Tubal 3000
<<locked>>
85%
56782
89%
**31
100%
SNPE Vectan Tubal 5000
<<locked>>
91%
57319
90%
**28
100%
SNPE Vectan Tubal 7000
<<locked>>
95%
57392
90%
**97
99%
SNPE Vectan Tubal 8000
<<locked>>
97%
45440
71%
**31
95%
Shooters World Long Rifle
<<locked>>
95%
56942
89%
**40
99%
Shooters World Match Rifle
<<locked>>
85%
56855
89%
**23
100%
Shooters World Precision
<<locked>>
89%
57435
90%
**30
100%
Shooters World SW4350
<<locked>>
97%
57246
90%
**66
99%
Somchem S335
<<locked>>
86%
57261
90%
**44
100%
Somchem S341
<<locked>>
85%
57319
90%
**30
100%
Somchem S355
<<locked>>
92%
56913
89%
**49
100%
[Somchem S361]*
<<locked>>
97%
51488
81%
**35
94%
Somchem S365
<<locked>>
97%
50067
78%
**36
100%
Somchem S385
<<locked>>
97%
46789
73%
**28
96%
Vihtavuori N133
<<locked>>
85%
57246
90%
**18
100%
Vihtavuori N135
<<locked>>
89%
57363
90%
**74
100%
Vihtavuori N140
<<locked>>
87%
57058
89%
**77
100%
Vihtavuori N150
<<locked>>
93%
57145
90%
**03
100%
Vihtavuori N160
<<locked>>
96%
57334
90%
**72
100%
[Vihtavuori N165]*
<<locked>>
97%
40016
63%
**84
93%
Vihtavuori N530
<<locked>>
84%
57000
89%
**10
100%
Vihtavuori N540
<<locked>>
88%
57305
90%
**97
100%
Vihtavuori N550 👍
<<locked>>
97%
56782
89%
**79
100%
Vihtavuori N555
<<locked>>
97%
43250
68%
**31
99%
[Vihtavuori N560]*
<<locked>>
97%
44150
69%
**48
92%
Winchester 6.5 StaBALL
<<locked>>
96%
57319
90%
**43
100%
Winchester 748
<<locked>>
84%
57029
89%
**56
100%
Winchester 760
<<locked>>
95%
56768
89%
**12
99%
Winchester StaBALL HD
<<locked>>
97%
34795
55%
**56
99%
Winchester StaBALL Match
<<locked>>
86%
56942
89%
**49
100%
[Winchester Supreme 780]*
<<locked>>
97%
43410
68%
**49
94%

Max Load - Barrel Length: 23.60''

Powder
Charge
FR
MaxP
%
V(0)
z
ADI AR 2206H
<<locked>>
81%
49893
78%
**51
100%
ADI AR 2208
<<locked>>
81%
42163
66%
**03
99%
[ADI AR 2209]*
<<locked>>
87%
35404
55%
**08
90%
ADI Benchmark 8208
<<locked>>
81%
52025
82%
**48
100%
Accurate 2495
<<locked>>
81%
46441
73%
**36
100%
Accurate 2700
<<locked>>
81%
45281
71%
**13
95%
[Accurate 3100]*
<<locked>>
85%
27151
43%
**15
90%
Accurate 4064
<<locked>>
81%
43947
69%
**36
100%
Accurate 4350
<<locked>>
81%
32692
51%
**75
95%
Alliant AR-Comp
<<locked>>
81%
53113
83%
**28
100%
Alliant Power Pro 2000-MR
<<locked>>
81%
45803
72%
**90
99%
Alliant Reloder- TS 15.5
<<locked>>
81%
42264
66%
**26
100%
Alliant Reloder-15
<<locked>>
81%
45310
71%
**92
99%
Alliant Reloder-16
<<locked>>
81%
32721
51%
**88
96%
Alliant Reloder-17
<<locked>>
81%
36637
57%
**03
99%
[Alliant Reloder-19]*
<<locked>>
87%
34621
54%
**02
90%
[Alliant Reloder-22]*
<<locked>>
91%
34418
54%
**31
90%
[Alliant Reloder-23]*
<<locked>>
81%
23815
37%
**42
92%
[Alliant Reloder-25]*
<<locked>>
91%
28427
45%
**80
90%
[Alliant Reloder-26]*
<<locked>>
83%
26571
42%
**70
90%
Baschieri & Pellagri 107
<<locked>>
81%
49487
78%
**54
99%
[Bofors RP15]*
<<locked>>
94%
34592
54%
**38
90%
Bofors RP3
<<locked>>
81%
42221
66%
**33
100%
[Bofors RP5]*
<<locked>>
91%
34418
54%
**31
90%
[Bofors RP7]*
<<locked>>
81%
37695
59%
**02
93%
Hodgdon BL-C2
<<locked>>
81%
51227
80%
**71
100%
Hodgdon Benchmark
<<locked>>
81%
53519
84%
**35
100%
Hodgdon H380
<<locked>>
81%
42844
67%
**39
98%
[Hodgdon H414]*
<<locked>>
81%
34809
55%
**15
93%
[Hodgdon H4350]*
<<locked>>
81%
38159
60%
**41
92%
[Hodgdon H4831]*
<<locked>>
93%
41075
64%
**10
90%
[Hodgdon H4831 SC]*
<<locked>>
94%
41278
65%
**10
90%
Hodgdon H4895
<<locked>>
81%
50372
79%
**54
100%
Hodgdon Hybrid 100V
<<locked>>
81%
30168
47%
**90
96%
Hodgdon LEVERevolution
<<locked>>
81%
46514
73%
**35
100%
[Hodgdon Superformance]*
<<locked>>
81%
34156
54%
**15
92%
Hodgdon TrailBoss
<<locked>>
81%
27079
42%
**19
100%
Hodgdon VARGET
<<locked>>
81%
48196
76%
**08
100%
IMR 3031
<<locked>>
81%
50241
79%
**38
100%
IMR 4064
<<locked>>
81%
44353
69%
**30
99%
IMR 4166 Enduron
<<locked>>
81%
46949
74%
**56
97%
[IMR 4350]*
<<locked>>
81%
33388
52%
**29
91%
[IMR 4451 Enduron]*
<<locked>>
81%
39262
62%
**34
94%
IMR 4831
<<locked>>
81%
31618
50%
**36
95%
IMR 4895
<<locked>>
81%
46514
73%
**18
100%
[IMR 4955 Enduron]*
<<locked>>
91%
39537
62%
**51
90%
IMR 8208 XBR
<<locked>>
81%
52025
82%
**48
100%
Lovex D073.6
<<locked>>
81%
49313
77%
**21
100%
Lovex S060
<<locked>>
81%
49255
77%
**82
100%
Lovex S062
<<locked>>
81%
44251
69%
**33
100%
Lovex S065
<<locked>>
81%
36564
57%
**85
95%
[Lovex S070]*
<<locked>>
81%
34751
54%
**59
93%
[Lovex S071]*
<<locked>>
90%
27064
42%
**15
90%
Norma 201
<<locked>>
81%
48776
76%
**02
100%
Norma 202
<<locked>>
81%
49182
77%
**02
100%
Norma 203B
<<locked>>
81%
44817
70%
**82
99%
[Norma 204]*
<<locked>>
83%
35288
55%
**02
90%
[Norma MRP]*
<<locked>>
87%
31314
49%
**79
90%
Norma URP
<<locked>>
81%
32793
51%
**75
95%
Ramshot Big Game
<<locked>>
81%
44599
70%
**95
99%
[Ramshot Hunter]*
<<locked>>
81%
32082
50%
**52
93%
Ramshot TAC
<<locked>>
81%
52112
82%
**61
99%
Ramshot Wild Boar
<<locked>>
81%
51909
81%
**84
100%
ReloadSwiss RS 14
<<locked>>
81%
27485
43%
**55
100%
ReloadSwiss RS 50
<<locked>>
81%
43221
68%
**20
97%
ReloadSwiss RS 52
<<locked>>
81%
48037
75%
**90
100%
ReloadSwiss RS 60
<<locked>>
81%
39102
61%
**69
100%
ReloadSwiss RS 62
<<locked>>
81%
32343
51%
**85
95%
[ReloadSwiss RS 70]*
<<locked>>
81%
32256
51%
**82
94%
Rottweil R 901
<<locked>>
81%
52765
83%
**28
100%
Rottweil R 902
<<locked>>
81%
46267
72%
**49
100%
Rottweil R 903
<<locked>>
81%
39639
62%
**84
99%
[Rottweil R 904]*
<<locked>>
88%
37927
59%
**25
90%
[Rottweil R 905]*
<<locked>>
88%
33881
53%
**95
90%
[Rottweil R 907]*
<<locked>>
81%
37695
59%
**02
93%
SNPE Vectan SP 11
<<locked>>
81%
40712
64%
**26
99%
SNPE Vectan SP 7
<<locked>>
81%
50705
79%
**44
99%
SNPE Vectan SP 9
<<locked>>
81%
48066
75%
**12
100%
SNPE Vectan Tubal 3000
<<locked>>
81%
49879
78%
**43
100%
SNPE Vectan Tubal 5000
<<locked>>
81%
41669
65%
**18
100%
[SNPE Vectan Tubal 7000]*
<<locked>>
81%
35853
56%
**36
93%
[SNPE Vectan Tubal 8000]*
<<locked>>
88%
34098
53%
**02
90%
Shooters World Long Rifle
<<locked>>
81%
36564
57%
**85
95%
Shooters World Match Rifle
<<locked>>
81%
49313
77%
**21
100%
Shooters World Precision
<<locked>>
81%
44251
69%
**33
100%
[Shooters World SW4350]*
<<locked>>
81%
34751
54%
**59
93%
Somchem S335
<<locked>>
81%
49487
78%
**39
100%
Somchem S341
<<locked>>
81%
50473
79%
**38
100%
Somchem S355
<<locked>>
81%
40292
63%
**80
99%
[Somchem S361]*
<<locked>>
90%
40451
63%
**44
90%
Somchem S365
<<locked>>
81%
29486
46%
**33
98%
[Somchem S385]*
<<locked>>
85%
31024
49%
**03
90%
Vihtavuori N133
<<locked>>
81%
50212
79%
**30
100%
Vihtavuori N135
<<locked>>
81%
43772
69%
**93
100%
Vihtavuori N140
<<locked>>
81%
46543
73%
**33
100%
Vihtavuori N150
<<locked>>
81%
38377
60%
**18
100%
Vihtavuori N160
<<locked>>
81%
34287
54%
**82
96%
[Vihtavuori N165]*
<<locked>>
91%
33069
52%
**33
90%
Vihtavuori N530
<<locked>>
81%
52460
82%
**48
100%
Vihtavuori N540
<<locked>>
81%
44875
70%
**26
100%
Vihtavuori N550
<<locked>>
81%
33823
53%
**79
95%
[Vihtavuori N555]*
<<locked>>
81%
25353
40%
**11
92%
[Vihtavuori N560]*
<<locked>>
94%
40089
63%
**62
90%
Winchester 6.5 StaBALL
<<locked>>
81%
34142
53%
**59
98%
Winchester 748
<<locked>>
81%
52402
82%
**87
100%
[Winchester 760]*
<<locked>>
81%
35128
55%
**21
93%
[Winchester StaBALL HD]*
<<locked>>
84%
23061
36%
**59
90%
Winchester StaBALL Match
<<locked>>
81%
48138
75%
**25
100%
[Winchester Supreme 780]*
<<locked>>
90%
34766
54%
**72
90%

Start Load - Barrel Length: 23.60''

Any powder missing? Then click here.

FR ... fill rate of the cartridge in percent

MaxP ... max. pressure of load in psi or bar

% ... max. pressure of load in percent of the maximum allowed pressure for this caliber 

V(0) ... muzzle velocity in feet per second (fps) or  meters per second (m/s)

z ... powder burnt in percent

[...] *... not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.

[...] ²... fill rate low - you might want to consider using a filler to ensure proper ignition.

[...] ᴾ... possible press load - work up slowly to this load while watching for signs of excessive pressure.

👍  ... recommended powder/load for this caliber and bullet combination based on its ballistic performance.

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