Load data for .375 Fl. Mag. N.E. + .375 | 250gr | Sierra SBT GameKing

Recommended Powder(s): ReloadSwiss RS 52, ReloadSwiss RS 60, Rottweil R 903

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.375 \| 250gr \| Sierra SBT GameKing
Manufacturer SKU:	2950
Bullet Weight:	250gr \| 16.2g
Bullet Diameter:	0.375" \| 9.52mm
Bullet Length:	1.183" \| 30.0mm
Caliber:	.375 Fl. Mag. N.E. load data
Case Length (l3):	2.940" \| 74.7mm
Cartridge Length (C.O.L.):	3.743" \| 95.1mm
Seated Depth:	0.380" \| 9.7mm
Shank Seated Depth:	0.240" \| 6.1mm
Case Capacity:	94.1 Grains of Water \| 6.11 cm³
Primer Size:	Large Rifle Magnum (LRM)
Max. allowed Pressure:	47137 psi \| 3250 bar
LID:	LID_B5957_C541
Last updated:	2025-02-02
Recommended Twist Rate:	1:20 - 1:17

Load data for 120 loads in caliber .375 Fl. Mag. N.E. with .375 | 250gr | Sierra SBT GameKing bullet and 60 powders such as ReloadSwiss RS 52, ReloadSwiss RS 60, Rottweil R 903. 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".
A load must fulfill certain criteria to be listed in the default view below - see "powder criteria to fulfill to be listed".

Our load data might deviate from other sources - see the "most common reasons for deviations".

All loads are based on the bullet and case dimensions shown under "Load Specifications" - see "reloading suggestions" if you deviate.

You can set your specifications in the "Personalized Load Calculator".

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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.
Case Length (Inch)
Case Length (mm)
CaseCapacity (GoW)
Min z (%)
Min FR (%)
Max FR*
Barrel Length (Inch)
Barrel Length (cm)
Safety Buffer (%)
.

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>>	87%	42250	90%	**97	97%
[Accurate 2700]*	<<locked>>	89%	42395	90%	**41	91%
Accurate 4064	<<locked>>	87%	42148	89%	**30	100%
Accurate 4350	<<locked>>	97%	42409	90%	**92	96%
Alliant Reloder- TS 15.5	<<locked>>	88%	41916	89%	**30	98%
Alliant Reloder-15	<<locked>>	86%	42134	89%	**36	97%
Alliant Reloder-16	<<locked>>	97%	42351	90%	**89	96%
Alliant Reloder-17	<<locked>>	92%	42119	89%	**25	98%
[Alliant Reloder-23]*	<<locked>>	97%	30139	64%	**26	92%
Baschieri & Pellagri 107	<<locked>>	83%	42409	90%	**43	96%
Hodgdon CFE223	<<locked>>	87%	42163	89%	**72	96%
Hodgdon H380	<<locked>>	87%	41785	89%	**23	95%
[Hodgdon H414]*	<<locked>>	91%	41930	89%	**66	93%
[Hodgdon H4350]*	<<locked>>	97%	41452	88%	**90	91%
Hodgdon Hybrid 100V	<<locked>>	97%	38827	82%	**87	97%
Hodgdon LVR	<<locked>>	94%	42322	90%	**66	95%
Hodgdon VARGET	<<locked>>	88%	41858	89%	**93	97%
IMR 3031	<<locked>>	85%	42076	89%	**43	100%
IMR 4064	<<locked>>	88%	42119	89%	**93	97%
[IMR 4166 Enduron]*	<<locked>>	88%	42206	90%	**54	93%
[IMR 4350]*	<<locked>>	95%	42090	89%	**07	92%
[IMR 4451 Enduron]*	<<locked>>	90%	41916	89%	**77	92%
[IMR 4831]*	<<locked>>	97%	36201	77%	**48	94%
IMR 4895	<<locked>>	85%	42119	89%	**49	98%
Lovex D073.6	<<locked>>	83%	42366	90%	**33	100%
Lovex S062	<<locked>>	86%	42337	90%	**03	99%
Lovex S065	<<locked>>	93%	42264	90%	**00	95%
[Lovex S070]*	<<locked>>	94%	41756	89%	**10	93%
Norma 201	<<locked>>	83%	42206	90%	**93	99%
Norma 203B	<<locked>>	86%	42018	89%	**33	97%
Norma URP	<<locked>>	96%	42076	89%	**75	96%
Ramshot Big Game	<<locked>>	87%	42380	90%	**66	97%
[Ramshot Hunter]*	<<locked>>	97%	42293	90%	**79	94%
[ReloadSwiss RS 50]*	<<locked>>	87%	42424	90%	**00	94%
ReloadSwiss RS 52 👍	<<locked>>	87%	42061	89%	**75	99%
ReloadSwiss RS 60 👍	<<locked>>	93%	41974	89%	**25	99%
ReloadSwiss RS 62	<<locked>>	97%	41800	89%	**98	96%
ReloadSwiss RS 70	<<locked>>	96%	42105	89%	**98	95%
Rottweil R 902	<<locked>>	84%	41843	89%	**74	99%
Rottweil R 903 👍	<<locked>>	90%	41901	89%	**36	98%
[Rottweil R 907]*	<<locked>>	91%	41974	89%	**74	92%
SNPE Vectan SP 11	<<locked>>	89%	41974	89%	**66	97%
SNPE Vectan SP 9	<<locked>>	83%	42206	90%	**13	97%
SNPE Vectan Tubal 5000	<<locked>>	88%	41945	89%	**31	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	93%	42380	90%	**64	93%
Shooters World Long Rifle	<<locked>>	93%	42264	90%	**00	95%
Shooters World Match Rifle	<<locked>>	83%	42366	90%	**33	100%
Shooters World Precision	<<locked>>	86%	42337	90%	**03	99%
Somchem S355	<<locked>>	89%	41887	89%	**20	98%
Somchem S365	<<locked>>	97%	38218	81%	**46	98%
Vihtavuori N133	<<locked>>	84%	42134	89%	**25	100%
Vihtavuori N135	<<locked>>	91%	42351	90%	**93	100%
Vihtavuori N140	<<locked>>	85%	42293	90%	**80	100%
Vihtavuori N150	<<locked>>	95%	42018	89%	**03	99%
Vihtavuori N160	<<locked>>	94%	42380	90%	**39	96%
Vihtavuori N540	<<locked>>	85%	41814	89%	**97	100%
Vihtavuori N550	<<locked>>	93%	41756	89%	**69	96%
[Vihtavuori N555]*	<<locked>>	97%	31647	67%	**98	93%
Winchester 6.5 StaBALL	<<locked>>	94%	42134	89%	**13	98%
[Winchester 760]*	<<locked>>	91%	41930	89%	**66	93%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AR 2208]*	<<locked>>	81%	34461	73%	**39	94%
[Accurate 2700]*	<<locked>>	86%	38812	82%	**72	90%
Accurate 4064	<<locked>>	81%	34243	73%	**72	99%
[Accurate 4350]*	<<locked>>	85%	27920	59%	**64	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	33721	72%	**62	96%
Alliant Reloder-15	<<locked>>	81%	36230	77%	**08	95%
[Alliant Reloder-16]*	<<locked>>	85%	29675	63%	**80	90%
[Alliant Reloder-17]*	<<locked>>	81%	29095	62%	**97	92%
[Alliant Reloder-23]*	<<locked>>	93%	27137	58%	**31	90%
Baschieri & Pellagri 107	<<locked>>	81%	39276	83%	**77	95%
[Hodgdon CFE223]*	<<locked>>	81%	34505	73%	**05	93%
[Hodgdon H380]*	<<locked>>	81%	34055	72%	**49	93%
[Hodgdon H414]*	<<locked>>	87%	36230	77%	**44	90%
[Hodgdon H4350]*	<<locked>>	94%	38609	82%	**31	90%
[Hodgdon Hybrid 100V]*	<<locked>>	83%	25251	54%	**36	90%
[Hodgdon LVR]*	<<locked>>	83%	30560	65%	**97	90%
[Hodgdon VARGET]*	<<locked>>	81%	34360	73%	**33	94%
IMR 3031	<<locked>>	81%	36651	78%	**38	100%
[IMR 4064]*	<<locked>>	81%	33808	72%	**13	94%
[IMR 4166 Enduron]*	<<locked>>	83%	36289	77%	**29	90%
[IMR 4350]*	<<locked>>	92%	38043	81%	**18	90%
[IMR 4451 Enduron]*	<<locked>>	85%	36347	77%	**62	90%
[IMR 4831]*	<<locked>>	88%	28239	60%	**51	90%
IMR 4895	<<locked>>	81%	36999	78%	**44	96%
Lovex D073.6	<<locked>>	81%	39088	83%	**70	99%
Lovex S062	<<locked>>	81%	35795	76%	**75	97%
[Lovex S065]*	<<locked>>	83%	31618	67%	**64	90%
[Lovex S070]*	<<locked>>	89%	35157	75%	**65	90%
Norma 201	<<locked>>	81%	39668	84%	**44	98%
Norma 203B	<<locked>>	81%	35621	76%	**05	96%
[Norma URP]*	<<locked>>	85%	29153	62%	**70	90%
Ramshot Big Game	<<locked>>	81%	35012	74%	**08	95%
[Ramshot Hunter]*	<<locked>>	90%	34243	73%	**02	90%
[ReloadSwiss RS 50]*	<<locked>>	81%	34853	74%	**43	91%
ReloadSwiss RS 52	<<locked>>	81%	34171	72%	**11	97%
[ReloadSwiss RS 60]*	<<locked>>	81%	28398	60%	**80	93%
[ReloadSwiss RS 62]*	<<locked>>	86%	29820	63%	**16	90%
[ReloadSwiss RS 70]*	<<locked>>	89%	33344	71%	**88	90%
Rottweil R 902	<<locked>>	81%	37956	81%	**02	98%
Rottweil R 903	<<locked>>	81%	30893	66%	**00	95%
[Rottweil R 907]*	<<locked>>	88%	37956	81%	**98	90%
[SNPE Vectan SP 11]*	<<locked>>	81%	32227	68%	**43	94%
SNPE Vectan SP 9	<<locked>>	81%	39146	83%	**57	97%
SNPE Vectan Tubal 5000	<<locked>>	81%	34055	72%	**80	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	88%	34954	74%	**20	90%
[Shooters World Long Rifle]*	<<locked>>	83%	31618	67%	**64	90%
Shooters World Match Rifle	<<locked>>	81%	39088	83%	**70	99%
Shooters World Precision	<<locked>>	81%	35795	76%	**75	97%
Somchem S355	<<locked>>	81%	31981	68%	**03	95%
[Somchem S365]*	<<locked>>	81%	23206	49%	**19	90%
Vihtavuori N133	<<locked>>	81%	38972	83%	**69	100%
Vihtavuori N135	<<locked>>	81%	31140	66%	**74	100%
Vihtavuori N140	<<locked>>	81%	37043	79%	**85	99%
[Vihtavuori N150]*	<<locked>>	81%	27238	58%	**72	94%
[Vihtavuori N160]*	<<locked>>	82%	29283	62%	**44	90%
Vihtavuori N540	<<locked>>	81%	36825	78%	**02	99%
[Vihtavuori N550]*	<<locked>>	82%	29066	62%	**74	90%
[Vihtavuori N555]*	<<locked>>	92%	27644	59%	**87	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	27340	58%	**65	92%
[Winchester 760]*	<<locked>>	87%	36230	77%	**44	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.

<<locked>>... you need to buy an access license to unlock the data