Load data for .375 Fl. Mag. N.E. + .375 | 250gr | Speer TBBC

Recommended Powder(s): ReloadSwiss RS 52, ReloadSwiss RS 60, Somchem S355

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.375 \| 250gr \| Speer TBBC
Manufacturer SKU:	1778
Bullet Weight:	250gr \| 16.2g
Bullet Diameter:	0.375" \| 9.52mm
Bullet Length:	1.215" \| 30.9mm
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:	0.412" \| 10.5mm
Shank Seated Depth:	0.412" \| 10.5mm
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_B6244_C541
Last updated:	2025-01-01

Load data for 118 loads in caliber .375 Fl. Mag. N.E. with .375 | 250gr | Speer TBBC bullet and 59 powders such as ReloadSwiss RS 52, ReloadSwiss RS 60, Somchem S355. 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>>	88%	42090	89%	**80	97%
Accurate 4064	<<locked>>	88%	42148	89%	**20	100%
Accurate 4350	<<locked>>	97%	41858	89%	**75	96%
Alliant Reloder- TS 15.5	<<locked>>	88%	42177	89%	**23	98%
Alliant Reloder-15	<<locked>>	86%	41959	89%	**23	97%
Alliant Reloder-16	<<locked>>	97%	42119	89%	**79	96%
Alliant Reloder-17	<<locked>>	93%	41989	89%	**08	98%
[Alliant Reloder-23]*	<<locked>>	97%	29950	64%	**06	92%
Baschieri & Pellagri 107	<<locked>>	83%	42134	89%	**20	96%
Hodgdon CFE223	<<locked>>	87%	41916	89%	**52	96%
Hodgdon H380	<<locked>>	88%	41887	89%	**10	95%
[Hodgdon H414]*	<<locked>>	92%	42264	90%	**62	92%
Hodgdon Hybrid 100V	<<locked>>	97%	39001	83%	**80	97%
Hodgdon LVR	<<locked>>	94%	42293	90%	**56	95%
Hodgdon VARGET	<<locked>>	88%	42177	89%	**87	97%
IMR 3031	<<locked>>	86%	42177	89%	**33	100%
IMR 4064	<<locked>>	89%	42424	90%	**87	97%
[IMR 4166 Enduron]*	<<locked>>	88%	41930	89%	**34	92%
[IMR 4350]*	<<locked>>	96%	41989	89%	**84	91%
[IMR 4451 Enduron]*	<<locked>>	90%	42380	90%	**77	92%
[IMR 4831]*	<<locked>>	97%	35969	76%	**31	94%
IMR 4895	<<locked>>	85%	41901	89%	**33	97%
Lovex D073.6	<<locked>>	84%	42308	90%	**16	100%
Lovex S062	<<locked>>	86%	42293	90%	**90	99%
[Lovex S065]*	<<locked>>	93%	42177	89%	**87	94%
[Lovex S070]*	<<locked>>	95%	41989	89%	**00	93%
Norma 201	<<locked>>	83%	42061	89%	**77	98%
Norma 202	<<locked>>	83%	42105	89%	**93	100%
Norma 203B	<<locked>>	87%	42409	90%	**30	97%
Norma URP	<<locked>>	97%	42366	90%	**69	96%
Ramshot Big Game	<<locked>>	87%	42032	89%	**46	97%
[Ramshot Hunter]*	<<locked>>	97%	41640	88%	**52	93%
[ReloadSwiss RS 50]*	<<locked>>	87%	42221	90%	**80	93%
ReloadSwiss RS 52 👍	<<locked>>	88%	42264	90%	**69	99%
ReloadSwiss RS 60 👍	<<locked>>	94%	42366	90%	**21	99%
ReloadSwiss RS 62	<<locked>>	97%	41785	89%	**89	95%
[ReloadSwiss RS 70]*	<<locked>>	96%	42061	89%	**75	94%
Rottweil R 902	<<locked>>	85%	42003	89%	**67	98%
Rottweil R 903	<<locked>>	91%	42148	89%	**30	98%
[Rottweil R 907]*	<<locked>>	92%	42148	89%	**70	92%
SNPE Vectan SP 11	<<locked>>	90%	42119	89%	**56	97%
SNPE Vectan SP 9	<<locked>>	84%	42322	90%	**07	97%
SNPE Vectan Tubal 5000	<<locked>>	88%	42206	90%	**25	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	94%	42366	90%	**48	93%
[Shooters World Long Rifle]*	<<locked>>	93%	42177	89%	**87	94%
Shooters World Match Rifle	<<locked>>	84%	42308	90%	**16	100%
Shooters World Precision	<<locked>>	86%	42293	90%	**90	99%
Somchem S355 👍	<<locked>>	90%	42163	89%	**16	98%
Somchem S365	<<locked>>	97%	37811	80%	**20	98%
Vihtavuori N133	<<locked>>	84%	41785	89%	**08	100%
Vihtavuori N135	<<locked>>	91%	42192	90%	**80	100%
Vihtavuori N140	<<locked>>	85%	41872	89%	**70	100%
Vihtavuori N150	<<locked>>	96%	42395	90%	**93	99%
Vihtavuori N160	<<locked>>	94%	41989	89%	**26	96%
Vihtavuori N540	<<locked>>	85%	41916	89%	**93	100%
Vihtavuori N550	<<locked>>	94%	42003	89%	**66	96%
[Vihtavuori N555]*	<<locked>>	97%	31372	67%	**82	92%
Winchester 6.5 StaBALL	<<locked>>	95%	42047	89%	**00	98%
[Winchester 760]*	<<locked>>	92%	42264	90%	**62	92%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AR 2208]*	<<locked>>	81%	34243	73%	**20	94%
Accurate 4064	<<locked>>	81%	34142	72%	**59	99%
[Accurate 4350]*	<<locked>>	86%	28253	60%	**67	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	33373	71%	**43	96%
Alliant Reloder-15	<<locked>>	81%	35911	76%	**95	95%
[Alliant Reloder-16]*	<<locked>>	86%	30240	64%	**83	90%
[Alliant Reloder-17]*	<<locked>>	81%	28805	61%	**74	92%
[Alliant Reloder-23]*	<<locked>>	94%	27499	58%	**31	90%
Baschieri & Pellagri 107	<<locked>>	81%	38914	83%	**54	95%
[Hodgdon CFE223]*	<<locked>>	81%	34258	73%	**82	93%
[Hodgdon H380]*	<<locked>>	81%	33721	72%	**33	92%
[Hodgdon H414]*	<<locked>>	88%	37159	79%	**48	90%
[Hodgdon Hybrid 100V]*	<<locked>>	84%	25947	55%	**46	90%
[Hodgdon LVR]*	<<locked>>	85%	31676	67%	**13	90%
[Hodgdon VARGET]*	<<locked>>	81%	34142	72%	**16	94%
IMR 3031	<<locked>>	81%	36187	77%	**18	100%
[IMR 4064]*	<<locked>>	81%	33518	71%	**97	94%
[IMR 4166 Enduron]*	<<locked>>	84%	36608	78%	**23	90%
[IMR 4350]*	<<locked>>	93%	38580	82%	**21	90%
[IMR 4451 Enduron]*	<<locked>>	86%	36941	78%	**59	90%
[IMR 4831]*	<<locked>>	89%	28558	61%	**44	90%
IMR 4895	<<locked>>	81%	36796	78%	**25	96%
Lovex D073.6	<<locked>>	81%	38551	82%	**51	99%
Lovex S062	<<locked>>	81%	35549	75%	**62	97%
[Lovex S065]*	<<locked>>	84%	32460	69%	**70	90%
[Lovex S070]*	<<locked>>	90%	35853	76%	**72	90%
Norma 201	<<locked>>	81%	39450	84%	**25	98%
Norma 202	<<locked>>	81%	39508	84%	**38	100%
Norma 203B	<<locked>>	81%	35447	75%	**88	95%
[Norma URP]*	<<locked>>	85%	29225	62%	**67	90%
Ramshot Big Game	<<locked>>	81%	34824	74%	**92	95%
[Ramshot Hunter]*	<<locked>>	91%	34882	74%	**98	90%
[ReloadSwiss RS 50]*	<<locked>>	81%	34621	73%	**20	90%
ReloadSwiss RS 52	<<locked>>	81%	33692	71%	**92	97%
[ReloadSwiss RS 60]*	<<locked>>	81%	28253	60%	**60	92%
[ReloadSwiss RS 62]*	<<locked>>	87%	30371	64%	**23	90%
[ReloadSwiss RS 70]*	<<locked>>	90%	34055	72%	**92	90%
Rottweil R 902	<<locked>>	81%	37434	79%	**79	97%
[Rottweil R 903]*	<<locked>>	81%	30574	65%	**80	94%
[Rottweil R 907]*	<<locked>>	89%	38638	82%	**98	90%
[SNPE Vectan SP 11]*	<<locked>>	81%	31966	68%	**26	94%
SNPE Vectan SP 9	<<locked>>	81%	38682	82%	**38	96%
SNPE Vectan Tubal 5000	<<locked>>	81%	33765	72%	**64	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	88%	35404	75%	**16	90%
[Shooters World Long Rifle]*	<<locked>>	84%	32460	69%	**70	90%
Shooters World Match Rifle	<<locked>>	81%	38551	82%	**51	99%
Shooters World Precision	<<locked>>	81%	35549	75%	**62	97%
Somchem S355	<<locked>>	81%	31763	67%	**93	95%
[Somchem S365]*	<<locked>>	82%	23670	50%	**26	90%
Vihtavuori N133	<<locked>>	81%	38551	82%	**52	100%
Vihtavuori N135	<<locked>>	81%	30821	65%	**51	99%
Vihtavuori N140	<<locked>>	81%	36782	78%	**72	99%
[Vihtavuori N150]*	<<locked>>	81%	27209	58%	**62	94%
[Vihtavuori N160]*	<<locked>>	83%	29486	63%	**34	90%
Vihtavuori N540	<<locked>>	81%	36448	77%	**85	99%
[Vihtavuori N550]*	<<locked>>	82%	29414	62%	**74	90%
[Vihtavuori N555]*	<<locked>>	93%	27717	59%	**74	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	27267	58%	**46	91%
[Winchester 760]*	<<locked>>	88%	37159	79%	**48	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