top of page

Load data for .338-378 Weath. Mag. + .338 | 254gr | CutEdge MTAC

Recommended Powder(s): ADI AR 2213, Accurate MAGPRO, ReloadSwiss RS 76, Vihtavuori N560, Vihtavuori N565

.338-378 Weath. Mag. + .338 | 254gr | CutEdge MTAC

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:
.338 | 254gr | CutEdge MTAC
Manufacturer SKU:
MTAC 338 254
Bullet Weight:
254gr | 16.5g
Bullet Diameter:
0.338" | 8.59mm
Bullet Length:
1.753" | 44.5mm
Caliber:
.338-378 Weath. Mag. load data
Case Length (l3):
2.910" | 73.9mm
Cartridge Length (C.O.L.):
3.694" | 93.8mm
Seated Depth:
0.969" | 24.6mm
Shank Seated Depth:
0.716" | 18.2mm
Case Capacity:
137.0 Grains of Water | 8.90 cm³
Primer Size:
Large Rifle Magnum (LRM)
Max. allowed Pressure:
63817 psi | 4400 bar
LID:
LID_B8520_C472
Last updated:
2025-09-18
Recommended Twist Rate:
1:10 - 1:9

Load data for 108 loads in caliber .338-378 Weath. Mag. with .338 | 254gr | CutEdge MTAC bullet and 54 powders such as ADI AR 2213, Accurate MAGPRO, ReloadSwiss RS 76, Vihtavuori N560, Vihtavuori N565. 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

  • .

    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 2209
<<locked>>
88%
57435
90%
**89
100%
ADI AR 2213 👍
<<locked>>
90%
57232
90%
**31
100%
ADI AR 2217
<<locked>>
97%
52562
82%
**59
100%
ADI AR 2218
<<locked>>
97%
45310
71%
**10
95%
ADI AR 2225
<<locked>>
97%
47210
74%
**17
100%
Accurate 3100
<<locked>>
90%
57087
89%
**26
100%
Accurate MAGPRO 👍
<<locked>>
91%
57145
90%
**38
99%
Alliant Reloder-16
<<locked>>
83%
57203
90%
**66
100%
Alliant Reloder-19
<<locked>>
88%
57305
90%
**85
100%
Alliant Reloder-22
<<locked>>
90%
57406
90%
**12
100%
Alliant Reloder-23
<<locked>>
92%
57377
90%
**53
100%
Alliant Reloder-25
<<locked>>
95%
57072
89%
**18
100%
Alliant Reloder-26
<<locked>>
87%
57334
90%
**31
100%
Alliant Reloder-33
<<locked>>
97%
49429
77%
**62
97%
[Alliant Reloder-50]*
<<locked>>
97%
41495
65%
**08
93%
Hodgdon H1000
<<locked>>
97%
52562
82%
**59
100%
Hodgdon H4350
<<locked>>
86%
57087
89%
**23
100%
Hodgdon H4831
<<locked>>
93%
57130
90%
**76
100%
Hodgdon H4831 SC
<<locked>>
89%
57130
90%
**76
100%
Hodgdon Hybrid 100V
<<locked>>
85%
57406
90%
**90
100%
Hodgdon Retumbo
<<locked>>
97%
47210
74%
**17
100%
Hodgdon TrailBoss
<<locked>>
96%
35679
56%
**96
100%
IMR 4350
<<locked>>
84%
57174
90%
**26
100%
IMR 4831
<<locked>>
87%
57232
90%
**23
100%
IMR 4955 Enduron
<<locked>>
90%
57145
90%
**43
100%
IMR 7828 SSC
<<locked>>
89%
57421
90%
**38
100%
IMR 7977 Enduron
<<locked>>
95%
57000
89%
**03
95%
IMR 8133 Enduron
<<locked>>
97%
43076
68%
**31
98%
[Lovex D100]*
<<locked>>
97%
51764
81%
**67
92%
Lovex S070
<<locked>>
83%
57203
90%
**20
100%
Lovex S071
<<locked>>
96%
57087
89%
**26
100%
Norma 204
<<locked>>
84%
57319
90%
**72
100%
Norma 217
<<locked>>
97%
43439
68%
**44
100%
Norma MRP
<<locked>>
88%
56942
89%
**31
100%
Norma URP
<<locked>>
83%
57058
89%
**36
100%
Ramshot Hunter
<<locked>>
84%
57101
89%
**56
100%
Ramshot Magnum
<<locked>>
91%
57406
90%
**95
100%
ReloadSwiss RS 14
<<locked>>
96%
36535
57%
**36
100%
ReloadSwiss RS 76 👍
<<locked>>
96%
57334
90%
**04
100%
ReloadSwiss RS 80
<<locked>>
97%
54810
86%
**38
99%
Rottweil R 904
<<locked>>
87%
57392
90%
**46
100%
Rottweil R 905
<<locked>>
88%
57072
89%
**76
100%
Somchem S361
<<locked>>
86%
57334
90%
**20
99%
Somchem S365
<<locked>>
84%
57305
90%
**23
100%
Somchem S385
<<locked>>
88%
57334
90%
**43
100%
Vihtavuori N150
<<locked>>
83%
57043
89%
**38
100%
Vihtavuori N165
<<locked>>
93%
57159
90%
**36
100%
Vihtavuori N170
<<locked>>
97%
48820
76%
**28
95%
Vihtavuori N555
<<locked>>
89%
57406
90%
**56
100%
Vihtavuori N560 👍
<<locked>>
90%
57174
90%
**48
100%
Vihtavuori N565 👍
<<locked>>
94%
56855
89%
**18
100%
Vihtavuori N568
<<locked>>
97%
55753
87%
**44
99%
Vihtavuori N570
<<locked>>
97%
53113
83%
**38
97%
Winchester StaBALL HD
<<locked>>
92%
56869
89%
**44
100%

Max Load - Barrel Length: 23.60''

Powder
Charge
FR
MaxP
%
V(0)
z
ADI AR 2209
<<locked>>
81%
45774
72%
**05
99%
ADI AR 2213
<<locked>>
81%
41060
64%
**43
97%
[ADI AR 2217]*
<<locked>>
81%
30168
47%
**87
93%
[ADI AR 2218]*
<<locked>>
91%
36042
56%
**90
90%
ADI AR 2225
<<locked>>
81%
27528
43%
**54
95%
Accurate 3100
<<locked>>
81%
41147
64%
**74
100%
Accurate MAGPRO
<<locked>>
81%
40538
64%
**39
95%
Alliant Reloder-16
<<locked>>
81%
52881
83%
**03
100%
Alliant Reloder-19
<<locked>>
81%
45629
72%
**92
99%
Alliant Reloder-22
<<locked>>
81%
41626
65%
**52
99%
Alliant Reloder-23
<<locked>>
81%
40161
63%
**93
100%
Alliant Reloder-25
<<locked>>
81%
34534
54%
**25
99%
Alliant Reloder-26
<<locked>>
81%
45353
71%
**51
100%
[Alliant Reloder-33]*
<<locked>>
87%
33736
53%
**28
90%
[Alliant Reloder-50]*
<<locked>>
92%
34853
55%
**61
90%
[Hodgdon H1000]*
<<locked>>
81%
30168
47%
**87
93%
Hodgdon H4350
<<locked>>
81%
49240
77%
**02
100%
Hodgdon H4831
<<locked>>
81%
38537
60%
**44
96%
Hodgdon H4831 SC
<<locked>>
81%
43047
67%
**30
97%
Hodgdon Hybrid 100V
<<locked>>
81%
49501
78%
**85
100%
Hodgdon Retumbo
<<locked>>
81%
27528
43%
**54
95%
Hodgdon TrailBoss
<<locked>>
90%
32866
52%
**40
100%
IMR 4350
<<locked>>
81%
51619
81%
**44
100%
IMR 4831
<<locked>>
81%
47137
74%
**75
100%
IMR 4955 Enduron
<<locked>>
81%
42409
66%
**97
97%
IMR 7828 SSC
<<locked>>
81%
42322
66%
**85
98%
[IMR 7977 Enduron]*
<<locked>>
86%
41655
65%
**44
90%
[IMR 8133 Enduron]*
<<locked>>
83%
26324
41%
**15
90%
[Lovex D100]*
<<locked>>
93%
45585
71%
**62
90%
Lovex S070
<<locked>>
81%
53621
84%
**74
100%
Lovex S071
<<locked>>
81%
35418
56%
**52
99%
Norma 204
<<locked>>
81%
52634
82%
**97
100%
[Norma 217]*
<<locked>>
81%
24831
39%
**82
92%
Norma MRP
<<locked>>
81%
43990
69%
**15
100%
Norma URP
<<locked>>
81%
53345
84%
**80
100%
Ramshot Hunter
<<locked>>
81%
52518
82%
**97
100%
Ramshot Magnum
<<locked>>
81%
39059
61%
**00
99%
ReloadSwiss RS 14
<<locked>>
87%
32068
50%
**47
100%
ReloadSwiss RS 76
<<locked>>
81%
32822
51%
**31
98%
[ReloadSwiss RS 80]*
<<locked>>
81%
29602
46%
**20
91%
Rottweil R 904
<<locked>>
81%
47036
74%
**79
99%
Rottweil R 905
<<locked>>
81%
45150
71%
**82
99%
Somchem S361
<<locked>>
81%
47616
75%
**69
98%
Somchem S365
<<locked>>
81%
50879
80%
**41
100%
Somchem S385
<<locked>>
81%
45658
72%
**66
100%
Vihtavuori N150
<<locked>>
81%
52924
83%
**79
100%
Vihtavuori N165
<<locked>>
81%
38406
60%
**18
98%
[Vihtavuori N170]*
<<locked>>
88%
36695
58%
**95
90%
Vihtavuori N555
<<locked>>
81%
44570
70%
**66
100%
Vihtavuori N560
<<locked>>
81%
41800
65%
**69
97%
Vihtavuori N565
<<locked>>
81%
35940
56%
**28
95%
[Vihtavuori N568]*
<<locked>>
81%
31082
49%
**52
91%
[Vihtavuori N570]*
<<locked>>
85%
34447
54%
**57
90%
Winchester StaBALL HD
<<locked>>
81%
37623
59%
**46
100%

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.

bottom of page