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Load data for .257 Weath. Mag. + .257 | 100gr | Sierra SBT GameKing

Recommended Powder(s): ADI AR 2209, Alliant Reloder-19, Alliant Reloder-26, Norma MRP, Rottweil R 905

.257 Weath. Mag. + .257 | 100gr | Sierra SBT GameKing

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:
.257 | 100gr | Sierra SBT GameKing
Manufacturer SKU:
1625
Bullet Weight:
100gr | 6.5g
Bullet Diameter:
0.257" | 6.53mm
Bullet Length:
0.991" | 25.2mm
Caliber:
.257 Weath. Mag. load data
Case Length (l3):
2.549" | 64.7mm
Cartridge Length (C.O.L.):
3.122" | 79.3mm
Seated Depth:
0.418" | 10.6mm
Shank Seated Depth:
0.288" | 7.3mm
Case Capacity:
84.0 Grains of Water | 5.45 cm³
Primer Size:
Large Rifle Magnum (LRM)
Max. allowed Pressure:
63817 psi | 4400 bar
LID:
LID_B5795_C247
Last updated:
2025-02-02
Recommended Twist Rate:
1:12 - 1:10

Load data for 152 loads in caliber .257 Weath. Mag. with .257 | 100gr | Sierra SBT GameKing bullet and 76 powders such as ADI AR 2209, Alliant Reloder-19, Alliant Reloder-26, Norma MRP, Rottweil R 905. 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".

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    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.

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 2208
<<locked>>
84%
63019
99%
**63
100%
ADI AR 2209 👍
<<locked>>
94%
63686
100%
**58
100%
ADI AR 2213
<<locked>>
96%
62917
99%
**81
99%
ADI AR 2217
<<locked>>
97%
46601
73%
**56
96%
ADI AR 2225
<<locked>>
97%
42047
66%
**04
98%
Accurate 2700
<<locked>>
85%
63005
99%
**17
100%
Accurate 3100
<<locked>>
97%
63614
100%
**76
100%
Accurate 4350
<<locked>>
88%
63527
100%
**09
100%
Accurate MAGPRO
<<locked>>
97%
63063
99%
**84
97%
Alliant Reloder- TS 15.5
<<locked>>
83%
63005
99%
**63
100%
Alliant Reloder-16
<<locked>>
90%
63237
99%
**58
100%
Alliant Reloder-17
<<locked>>
85%
63657
100%
**55
100%
Alliant Reloder-19 👍
<<locked>>
94%
63440
99%
**51
100%
Alliant Reloder-22
<<locked>>
97%
63759
100%
**84
100%
Alliant Reloder-23
<<locked>>
97%
60510
95%
**83
100%
Alliant Reloder-25
<<locked>>
97%
52707
83%
**27
100%
Alliant Reloder-26 👍
<<locked>>
93%
63353
99%
**04
100%
Hodgdon H1000
<<locked>>
97%
46601
73%
**56
96%
Hodgdon H414
<<locked>>
85%
63005
99%
**38
100%
Hodgdon H4350
<<locked>>
92%
63135
99%
**79
100%
Hodgdon H4831
<<locked>>
97%
58175
91%
**33
97%
Hodgdon H4831 SC
<<locked>>
95%
62946
99%
**15
98%
Hodgdon Hybrid 100V
<<locked>>
92%
63164
99%
**53
100%
Hodgdon LVR
<<locked>>
87%
63730
100%
**25
100%
Hodgdon Retumbo
<<locked>>
97%
42047
66%
**04
98%
Hodgdon Superperformance
<<locked>>
86%
62917
99%
**58
100%
Hodgdon VARGET
<<locked>>
85%
63454
99%
**63
100%
Hodgdon TrailBoss
<<locked>>
96%
35317
55%
**10
100%
IMR 4064
<<locked>>
85%
63759
100%
**53
100%
IMR 4166 Enduron
<<locked>>
86%
63469
99%
**63
100%
IMR 4350
<<locked>>
90%
63512
100%
**92
100%
IMR 4451 Enduron
<<locked>>
87%
63570
100%
**92
100%
IMR 4831
<<locked>>
93%
63179
99%
**92
100%
IMR 4955 Enduron
<<locked>>
97%
63425
99%
**99
99%
IMR 7828 SSC
<<locked>>
95%
62932
99%
**84
99%
[IMR 8133 Enduron]*
<<locked>>
97%
37434
59%
**76
92%
Lovex S065
<<locked>>
88%
63150
99%
**69
100%
Lovex S070
<<locked>>
89%
63556
100%
**89
100%
Lovex S071
<<locked>>
97%
52982
83%
**05
100%
Norma 204
<<locked>>
89%
63295
99%
**28
99%
Norma 217
<<locked>>
97%
37695
59%
**12
95%
Norma MRP 👍
<<locked>>
94%
63251
99%
**07
100%
Norma URP
<<locked>>
89%
63164
99%
**06
100%
Ramshot Hunter
<<locked>>
90%
63396
99%
**25
100%
Ramshot Magnum
<<locked>>
97%
63599
100%
**42
100%
ReloadSwiss RS 14
<<locked>>
97%
36405
57%
**62
100%
ReloadSwiss RS 50
<<locked>>
83%
63672
100%
**86
100%
ReloadSwiss RS 60
<<locked>>
86%
63701
100%
**68
100%
ReloadSwiss RS 62
<<locked>>
88%
63773
100%
**35
100%
ReloadSwiss RS 70
<<locked>>
89%
63121
99%
**71
100%
ReloadSwiss RS 76
<<locked>>
97%
52359
82%
**76
100%
ReloadSwiss RS 80
<<locked>>
97%
47761
75%
**32
95%
Rottweil R 903
<<locked>>
84%
63411
99%
**53
100%
Rottweil R 904
<<locked>>
93%
63048
99%
**92
99%
Rottweil R 905 👍
<<locked>>
94%
63353
99%
**45
100%
Rottweil R 907
<<locked>>
87%
63628
100%
**89
100%
SNPE Vectan SP 11
<<locked>>
84%
63411
99%
**89
100%
SNPE Vectan Tubal 5000
<<locked>>
85%
63541
100%
**19
100%
SNPE Vectan Tubal 7000
<<locked>>
88%
63005
99%
**10
100%
Shooters World Long Rifle
<<locked>>
88%
63150
99%
**69
100%
Somchem S355
<<locked>>
85%
63541
100%
**60
100%
Somchem S361
<<locked>>
92%
63295
99%
**63
98%
Somchem S365
<<locked>>
91%
63585
100%
**99
100%
Somchem S385
<<locked>>
94%
63324
99%
**99
100%
Vihtavuori N135
<<locked>>
86%
63353
99%
**55
100%
Vihtavuori N150
<<locked>>
90%
63643
100%
**04
100%
Vihtavuori N160
<<locked>>
87%
63222
99%
**76
100%
Vihtavuori N165
<<locked>>
97%
58842
92%
**10
99%
Vihtavuori N550
<<locked>>
87%
63614
100%
**12
100%
Vihtavuori N555
<<locked>>
95%
63309
99%
**22
100%
Vihtavuori N560
<<locked>>
96%
63135
99%
**01
99%
Vihtavuori N565
<<locked>>
97%
54969
86%
**23
97%
[Vihtavuori N568]*
<<locked>>
97%
48791
76%
**41
94%
Winchester 6.5 StaBALL
<<locked>>
88%
63164
99%
**20
100%
Winchester 760
<<locked>>
85%
63005
99%
**38
100%
Winchester StaBALL HD
<<locked>>
97%
59190
93%
**71
100%

Max Load - Barrel Length: 23.60''

Powder
Charge
FR
MaxP
%
V(0)
z
ADI AR 2208
<<locked>>
81%
57334
90%
**61
100%
ADI AR 2209
<<locked>>
81%
41147
64%
**22
95%
[ADI AR 2213]*
<<locked>>
81%
36695
58%
**20
91%
[ADI AR 2217]*
<<locked>>
88%
34925
55%
**54
90%
[ADI AR 2225]*
<<locked>>
86%
29660
46%
**20
90%
Accurate 2700
<<locked>>
81%
55840
87%
**02
99%
Accurate 3100
<<locked>>
81%
37043
58%
**67
96%
Accurate 4350
<<locked>>
81%
49530
78%
**69
100%
[Accurate MAGPRO]*
<<locked>>
84%
39784
62%
**09
90%
Alliant Reloder- TS 15.5
<<locked>>
81%
58813
92%
**91
100%
Alliant Reloder-16
<<locked>>
81%
47137
74%
**76
100%
Alliant Reloder-17
<<locked>>
81%
55100
86%
**17
100%
Alliant Reloder-19
<<locked>>
81%
41205
65%
**09
95%
[Alliant Reloder-22]*
<<locked>>
81%
36898
58%
**27
93%
Alliant Reloder-23
<<locked>>
81%
35476
56%
**94
99%
[Alliant Reloder-25]*
<<locked>>
81%
30792
48%
**72
94%
Alliant Reloder-26
<<locked>>
81%
39523
62%
**51
98%
[Hodgdon H1000]*
<<locked>>
88%
34925
55%
**54
90%
Hodgdon H414
<<locked>>
81%
55666
87%
**17
100%
Hodgdon H4350
<<locked>>
81%
44860
70%
**48
97%
[Hodgdon H4831]*
<<locked>>
82%
35998
56%
**48
90%
[Hodgdon H4831 SC]*
<<locked>>
81%
38493
60%
**23
91%
Hodgdon Hybrid 100V
<<locked>>
81%
44730
70%
**48
100%
Hodgdon LVR
<<locked>>
81%
51735
81%
**19
100%
[Hodgdon Retumbo]*
<<locked>>
86%
29660
46%
**20
90%
Hodgdon Superperformance
<<locked>>
81%
51430
81%
**61
99%
Hodgdon VARGET
<<locked>>
81%
56797
89%
**58
100%
Hodgdon TrailBoss
<<locked>>
81%
28326
44%
**42
100%
IMR 4064
<<locked>>
81%
56173
88%
**38
100%
IMR 4166 Enduron
<<locked>>
81%
54737
86%
**15
99%
IMR 4350
<<locked>>
81%
47036
74%
**94
98%
IMR 4451 Enduron
<<locked>>
81%
53359
84%
**12
99%
IMR 4831
<<locked>>
81%
42583
67%
**12
99%
[IMR 4955 Enduron]*
<<locked>>
81%
38711
61%
**00
92%
[IMR 7828 SSC]*
<<locked>>
81%
37637
59%
**49
91%
[IMR 8133 Enduron]*
<<locked>>
94%
34243
54%
**84
90%
Lovex S065
<<locked>>
81%
50691
79%
**50
100%
Lovex S070
<<locked>>
81%
48936
77%
**40
99%
[Lovex S071]*
<<locked>>
81%
31575
49%
**17
94%
Norma 204
<<locked>>
81%
47645
75%
**36
97%
[Norma 217]*
<<locked>>
90%
29892
47%
**69
90%
Norma MRP
<<locked>>
81%
38957
61%
**22
96%
Norma URP
<<locked>>
81%
48385
76%
**66
100%
Ramshot Hunter
<<locked>>
81%
47355
74%
**46
99%
[Ramshot Magnum]*
<<locked>>
81%
34287
54%
**41
93%
ReloadSwiss RS 14
<<locked>>
81%
28848
45%
**82
100%
ReloadSwiss RS 50
<<locked>>
81%
59524
93%
**14
100%
ReloadSwiss RS 60
<<locked>>
81%
53272
83%
**07
100%
ReloadSwiss RS 62
<<locked>>
81%
49559
78%
**99
100%
ReloadSwiss RS 70
<<locked>>
81%
47848
75%
**05
100%
[ReloadSwiss RS 76]*
<<locked>>
82%
30429
48%
**72
90%
[ReloadSwiss RS 80]*
<<locked>>
91%
38189
60%
**92
90%
Rottweil R 903
<<locked>>
81%
56536
89%
**51
100%
[Rottweil R 904]*
<<locked>>
81%
42540
67%
**95
94%
Rottweil R 905
<<locked>>
81%
40480
63%
**89
95%
Rottweil R 907
<<locked>>
81%
51822
81%
**86
99%
SNPE Vectan SP 11
<<locked>>
81%
58378
91%
**17
100%
SNPE Vectan Tubal 5000
<<locked>>
81%
55970
88%
**17
100%
SNPE Vectan Tubal 7000
<<locked>>
81%
49719
78%
**91
99%
Shooters World Long Rifle
<<locked>>
81%
50691
79%
**50
100%
Somchem S355
<<locked>>
81%
56217
88%
**51
100%
[Somchem S361]*
<<locked>>
81%
43424
68%
**82
94%
Somchem S365
<<locked>>
81%
45397
71%
**10
100%
Somchem S385
<<locked>>
81%
41075
64%
**76
96%
Vihtavuori N135
<<locked>>
81%
54157
85%
**23
100%
Vihtavuori N150
<<locked>>
81%
48080
75%
**58
100%
Vihtavuori N160
<<locked>>
81%
51967
81%
**92
100%
[Vihtavuori N165]*
<<locked>>
81%
34621
54%
**05
93%
Vihtavuori N550
<<locked>>
81%
52373
82%
**35
100%
Vihtavuori N555
<<locked>>
81%
39827
62%
**92
99%
[Vihtavuori N560]*
<<locked>>
81%
36883
58%
**40
91%
[Vihtavuori N565]*
<<locked>>
84%
35201
55%
**77
90%
[Vihtavuori N568]*
<<locked>>
91%
39160
61%
**12
90%
Winchester 6.5 StaBALL
<<locked>>
81%
49153
77%
**10
100%
Winchester 760
<<locked>>
81%
55666
87%
**17
100%
Winchester StaBALL HD
<<locked>>
81%
31720
50%
**10
99%

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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