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Load data for .257 Roberts + .257 | 117gr | Winchester SPRN

Recommended Powder(s): Accurate 4350, Alliant Reloder-16, Norma URP, ReloadSwiss RS 62, Somchem S365

.257 Roberts + .257 | 117gr | Winchester SPRN

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:
.257 | 117gr | Winchester SPRN
Bullet Weight:
117gr | 7.6g
Bullet Diameter:
0.257" | 6.53mm
Bullet Length:
1.000" | 25.4mm
Caliber:
.257 Roberts load data
Case Length (l3):
2.233" | 56.7mm
Cartridge Length (C.O.L.):
2.733" | 69.4mm
Seated Depth:
0.500" | 12.7mm
Shank Seated Depth:
0.500" | 12.7mm
Case Capacity:
56.0 Grains of Water | 3.64 cm³
Primer Size:
Large Rifle (LR)
Max. allowed Pressure:
51488 psi | 3550 bar
LID:
LID_B6611_C241
Last updated:
2025-01-01

Load data for 118 loads in caliber .257 Roberts with .257 | 117gr | Winchester SPRN bullet and 59 powders such as Accurate 4350, Alliant Reloder-16, Norma URP, ReloadSwiss RS 62, Somchem S365. 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>>
83%
45310
88%
**84
99%
[ADI AR 2209]*
<<locked>>
95%
45788
89%
**59
94%
Accurate 2700
<<locked>>
84%
45585
89%
**31
95%
Accurate 3100
<<locked>>
96%
40480
79%
**48
96%
Accurate 4350 👍
<<locked>>
90%
45614
89%
**62
99%
Alliant Reloder- TS 15.5
<<locked>>
83%
45324
88%
**07
100%
Alliant Reloder-16 👍
<<locked>>
91%
45774
89%
**05
99%
Alliant Reloder-17
<<locked>>
87%
46151
90%
**28
100%
Alliant Reloder-19
<<locked>>
96%
45818
89%
**62
95%
[Alliant Reloder-22]*
<<locked>>
96%
40886
79%
**07
93%
Alliant Reloder-23
<<locked>>
97%
39247
76%
**90
99%
[Alliant Reloder-25]*
<<locked>>
97%
34374
67%
**72
94%
Alliant Reloder-26
<<locked>>
97%
43468
84%
**38
98%
Hodgdon H414
<<locked>>
86%
45788
89%
**66
97%
Hodgdon H4350
<<locked>>
93%
46166
90%
**17
96%
Hodgdon Hybrid 100V
<<locked>>
94%
46064
89%
**46
100%
Hodgdon LVR
<<locked>>
88%
45847
89%
**62
98%
Hodgdon Superperformance
<<locked>>
89%
45397
88%
**82
96%
Hodgdon VARGET
<<locked>>
83%
45310
88%
**84
99%
Hodgdon TrailBoss
<<locked>>
95%
33794
66%
**19
100%
IMR 4064
<<locked>>
84%
45701
89%
**80
99%
IMR 4166 Enduron
<<locked>>
84%
46006
89%
**67
97%
IMR 4350
<<locked>>
91%
45600
89%
**00
96%
IMR 4451 Enduron
<<locked>>
86%
45600
89%
**84
96%
IMR 4831
<<locked>>
95%
45368
88%
**43
99%
[IMR 4955 Enduron]*
<<locked>>
96%
44512
86%
**74
92%
Lovex S065
<<locked>>
88%
45672
89%
**94
98%
Lovex S070
<<locked>>
89%
45498
88%
**07
97%
[Lovex S071]*
<<locked>>
97%
34040
66%
**00
94%
[Norma 204]*
<<locked>>
91%
45818
89%
**46
94%
Norma MRP
<<locked>>
97%
43250
84%
**95
96%
Norma URP 👍
<<locked>>
91%
45759
89%
**69
99%
Ramshot Hunter
<<locked>>
91%
45687
89%
**72
97%
[Ramshot Magnum]*
<<locked>>
97%
39624
77%
**54
93%
ReloadSwiss RS 14
<<locked>>
97%
34882
68%
**72
100%
ReloadSwiss RS 60
<<locked>>
88%
45600
89%
**35
100%
ReloadSwiss RS 62 👍
<<locked>>
91%
45832
89%
**95
99%
ReloadSwiss RS 70
<<locked>>
91%
46021
89%
**22
98%
Rottweil R 903
<<locked>>
85%
46021
89%
**17
100%
[Rottweil R 904]*
<<locked>>
94%
45716
89%
**10
93%
Rottweil R 905
<<locked>>
97%
45542
88%
**72
95%
Rottweil R 907
<<locked>>
87%
46296
90%
**94
96%
SNPE Vectan SP 11
<<locked>>
84%
45788
89%
**53
100%
SNPE Vectan Tubal 5000
<<locked>>
84%
46021
89%
**08
100%
SNPE Vectan Tubal 7000
<<locked>>
88%
45992
89%
**51
97%
Shooters World Long Rifle
<<locked>>
88%
45672
89%
**94
98%
Somchem S355
<<locked>>
85%
46282
90%
**17
100%
[Somchem S361]*
<<locked>>
93%
45556
88%
**67
92%
Somchem S365 👍
<<locked>>
94%
45788
89%
**05
100%
Somchem S385
<<locked>>
96%
46093
90%
**46
96%
Vihtavuori N135
<<locked>>
86%
45542
88%
**41
100%
Vihtavuori N150
<<locked>>
90%
45658
89%
**71
100%
Vihtavuori N160
<<locked>>
88%
45876
89%
**26
99%
[Vihtavuori N165]*
<<locked>>
97%
39059
76%
**89
93%
Vihtavuori N550
<<locked>>
88%
45788
89%
**62
99%
Vihtavuori N555
<<locked>>
96%
42569
83%
**53
99%
Winchester 6.5 StaBALL
<<locked>>
90%
46253
90%
**20
100%
Winchester 760
<<locked>>
86%
45788
89%
**66
97%
Winchester StaBALL HD
<<locked>>
97%
34780
68%
**80
99%

Max Load - Barrel Length: 23.60''

Powder
Charge
FR
MaxP
%
V(0)
z
ADI AR 2208
<<locked>>
81%
42424
82%
**31
99%
[ADI AR 2209]*
<<locked>>
88%
36027
70%
**43
90%
[Accurate 2700]*
<<locked>>
81%
41089
80%
**49
94%
[Accurate 3100]*
<<locked>>
86%
28021
54%
**39
90%
Accurate 4350
<<locked>>
81%
32793
64%
**87
95%
Alliant Reloder- TS 15.5
<<locked>>
81%
42496
83%
**54
100%
Alliant Reloder-16
<<locked>>
81%
32953
64%
**00
95%
Alliant Reloder-17
<<locked>>
81%
37014
72%
**38
99%
[Alliant Reloder-19]*
<<locked>>
87%
34693
67%
**20
90%
[Alliant Reloder-22]*
<<locked>>
92%
35143
68%
**72
90%
[Alliant Reloder-23]*
<<locked>>
81%
23989
47%
**44
92%
[Alliant Reloder-25]*
<<locked>>
91%
29008
56%
**02
90%
[Alliant Reloder-26]*
<<locked>>
83%
26760
52%
**88
90%
[Hodgdon H414]*
<<locked>>
81%
38290
74%
**12
94%
[Hodgdon H4350]*
<<locked>>
81%
31981
62%
**02
90%
Hodgdon Hybrid 100V
<<locked>>
81%
30487
59%
**05
96%
Hodgdon LVR
<<locked>>
81%
35868
70%
**46
96%
[Hodgdon Superperformance]*
<<locked>>
81%
34272
67%
**30
91%
Hodgdon VARGET
<<locked>>
81%
42424
82%
**31
99%
Hodgdon TrailBoss
<<locked>>
87%
30095
58%
**47
100%
IMR 4064
<<locked>>
81%
41887
81%
**05
99%
IMR 4166 Enduron
<<locked>>
81%
41307
80%
**72
95%
[IMR 4350]*
<<locked>>
81%
33649
65%
**41
91%
[IMR 4451 Enduron]*
<<locked>>
81%
39218
76%
**49
94%
[IMR 4831]*
<<locked>>
81%
28892
56%
**72
94%
[IMR 4955 Enduron]*
<<locked>>
93%
39987
78%
**82
90%
Lovex S065
<<locked>>
81%
36825
72%
**07
95%
[Lovex S070]*
<<locked>>
81%
35099
68%
**87
93%
[Lovex S071]*
<<locked>>
90%
27731
54%
**36
90%
[Norma 204]*
<<locked>>
84%
36027
70%
**33
90%
[Norma MRP]*
<<locked>>
88%
31966
62%
**16
90%
Norma URP
<<locked>>
81%
33286
65%
**00
95%
[Ramshot Hunter]*
<<locked>>
81%
32387
63%
**70
93%
[Ramshot Magnum]*
<<locked>>
93%
34534
67%
**26
90%
ReloadSwiss RS 14
<<locked>>
85%
29341
57%
**57
100%
ReloadSwiss RS 60
<<locked>>
81%
35810
70%
**18
99%
ReloadSwiss RS 62
<<locked>>
81%
32721
64%
**07
95%
[ReloadSwiss RS 70]*
<<locked>>
81%
32590
63%
**03
94%
Rottweil R 903
<<locked>>
81%
40074
78%
**08
99%
[Rottweil R 904]*
<<locked>>
89%
38334
74%
**59
90%
[Rottweil R 905]*
<<locked>>
88%
34867
68%
**33
91%
[Rottweil R 907]*
<<locked>>
81%
37956
74%
**23
93%
SNPE Vectan SP 11
<<locked>>
81%
41089
80%
**61
99%
SNPE Vectan Tubal 5000
<<locked>>
81%
41901
81%
**36
100%
[SNPE Vectan Tubal 7000]*
<<locked>>
81%
36172
70%
**51
93%
Shooters World Long Rifle
<<locked>>
81%
36825
72%
**07
95%
Somchem S355
<<locked>>
81%
40567
79%
**05
99%
[Somchem S361]*
<<locked>>
90%
40886
79%
**79
90%
Somchem S365
<<locked>>
81%
29762
58%
**44
98%
[Somchem S385]*
<<locked>>
85%
31763
62%
**34
90%
Vihtavuori N135
<<locked>>
81%
39523
77%
**36
100%
Vihtavuori N150
<<locked>>
81%
34751
68%
**57
99%
Vihtavuori N160
<<locked>>
81%
35984
70%
**26
96%
[Vihtavuori N165]*
<<locked>>
92%
33562
65%
**61
90%
Vihtavuori N550
<<locked>>
81%
36738
71%
**72
96%
[Vihtavuori N555]*
<<locked>>
81%
25672
50%
**26
92%
Winchester 6.5 StaBALL
<<locked>>
81%
34490
67%
**80
98%
[Winchester 760]*
<<locked>>
81%
38290
74%
**12
94%
[Winchester StaBALL HD]*
<<locked>>
85%
23757
46%
**90
91%

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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