Load data for .256 Mag. Gibbs + .257 | 95gr | Hammer HHT

Recommended Powder(s):

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 95gr \| Hammer HHT
Manufacturer SKU:	25095HT
Bullet Weight:	95gr \| 6.2g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	<<locked>>
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	<<locked>>
Seated Depth:	<<locked>>
Shank Seated Depth:	<<locked>>
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B10711_C231
Last updated:	2026-03-24
Recommended Twist Rate:	1:9 - 1:8

Load data for 122 loads in caliber .256 Mag. Gibbs with .257 | 95gr | Hammer HHT bullet and 61 powder(s). 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>>	86%	43714	89%	**40	97%
[Accurate 2700]*	<<locked>>	88%	44179	90%	**77	92%
Accurate 4064	<<locked>>	86%	43903	89%	**66	100%
Accurate 4350	<<locked>>	95%	44309	90%	**28	97%
Alliant Power Pro 2000-MR	<<locked>>	84%	43497	88%	**68	97%
Alliant Reloder- TS 15.5 👍	<<locked>>	87%	43801	89%	**79	99%
Alliant Reloder-15	<<locked>>	85%	44208	90%	**89	97%
Alliant Reloder-16	<<locked>>	95%	44222	90%	**58	97%
Alliant Reloder-17	<<locked>>	91%	43613	88%	**64	98%
[Alliant Reloder-23]*	<<locked>>	97%	32735	66%	**76	94%
[Alliant Reloder-26]*	<<locked>>	97%	35708	72%	**04	92%
Bofors RP3 👍	<<locked>>	87%	44324	90%	**95	99%
[Bofors RP7]*	<<locked>>	90%	43526	88%	**13	92%
Hodgdon CFE223	<<locked>>	86%	44251	90%	**25	97%
Hodgdon H380	<<locked>>	87%	44048	89%	**79	96%
[Hodgdon H414]*	<<locked>>	90%	43874	89%	**12	93%
[Hodgdon H4350]*	<<locked>>	96%	44222	90%	**56	92%
Hodgdon Hybrid 100V	<<locked>>	96%	42003	85%	**53	98%
Hodgdon LVR	<<locked>>	92%	43656	89%	**05	96%
[Hodgdon Superperformance]*	<<locked>>	92%	43976	89%	**18	92%
Hodgdon VARGET	<<locked>>	87%	44222	90%	**49	97%
Hodgdon TrailBoss	<<locked>>	96%	33243	67%	**29	100%
IMR 3031	<<locked>>	85%	44237	90%	**95	100%
IMR 4064	<<locked>>	87%	43613	88%	**36	97%
[IMR 4166 Enduron]*	<<locked>>	88%	44266	90%	**10	93%
[IMR 4350]*	<<locked>>	94%	43642	88%	**40	92%
[IMR 4451 Enduron]*	<<locked>>	89%	43743	89%	**20	93%
IMR 4831	<<locked>>	96%	39334	80%	**10	95%
IMR 4895	<<locked>>	84%	44251	90%	**09	98%
Lovex S062	<<locked>>	86%	44324	90%	**53	99%
Lovex S065	<<locked>>	92%	43932	89%	**43	95%
[Lovex S070]*	<<locked>>	93%	43918	89%	**49	93%
Norma 203B	<<locked>>	85%	43439	88%	**72	98%
Norma URP	<<locked>>	95%	43627	88%	**15	96%
Ramshot Big Game	<<locked>>	85%	43787	89%	**99	98%
[Ramshot Hunter]*	<<locked>>	95%	43714	89%	**12	94%
ReloadSwiss RS 14	<<locked>>	96%	33605	68%	**75	100%
[ReloadSwiss RS 50]*	<<locked>>	86%	43874	89%	**40	94%
ReloadSwiss RS 60 👍	<<locked>>	89%	43700	89%	**87	100%
ReloadSwiss RS 62	<<locked>>	95%	44222	90%	**48	96%
ReloadSwiss RS 70	<<locked>>	95%	44092	89%	**54	95%
Rottweil R 902	<<locked>>	84%	43555	88%	**20	99%
Rottweil R 903	<<locked>>	89%	44106	89%	**89	98%
[Rottweil R 907]*	<<locked>>	90%	43526	88%	**13	92%
SNPE Vectan SP 11	<<locked>>	88%	43613	88%	**09	98%
SNPE Vectan Tubal 5000	<<locked>>	87%	44106	89%	**77	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	92%	44295	90%	**90	93%
Shooters World Long Rifle	<<locked>>	92%	43932	89%	**43	95%
Shooters World Precision	<<locked>>	86%	44324	90%	**53	99%
Somchem S355	<<locked>>	88%	43642	88%	**63	98%
Somchem S365 👍	<<locked>>	97%	41553	84%	**18	99%
Vihtavuori N133	<<locked>>	83%	44193	90%	**71	100%
Vihtavuori N135	<<locked>>	90%	44338	90%	**33	100%
Vihtavuori N140	<<locked>>	84%	44193	90%	**23	100%
Vihtavuori N150	<<locked>>	93%	43526	88%	**33	99%
Vihtavuori N160	<<locked>>	92%	43424	88%	**69	96%
Vihtavuori N540	<<locked>>	84%	43816	89%	**40	100%
Vihtavuori N550	<<locked>>	92%	43671	89%	**09	96%
[Vihtavuori N555]*	<<locked>>	97%	34780	71%	**54	94%
Winchester 6.5 StaBALL	<<locked>>	93%	43787	89%	**49	98%
[Winchester 760]*	<<locked>>	90%	43874	89%	**12	93%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2208	<<locked>>	81%	36869	75%	**82	95%
[Accurate 2700]*	<<locked>>	84%	38928	79%	**59	90%
Accurate 4064	<<locked>>	81%	36869	75%	**15	99%
[Accurate 4350]*	<<locked>>	84%	29080	59%	**51	90%
Alliant Power Pro 2000-MR	<<locked>>	81%	39160	79%	**53	95%
Alliant Reloder- TS 15.5	<<locked>>	81%	36071	73%	**02	97%
Alliant Reloder-15	<<locked>>	81%	38827	79%	**64	96%
[Alliant Reloder-16]*	<<locked>>	84%	30342	62%	**67	90%
[Alliant Reloder-17]*	<<locked>>	81%	30995	63%	**33	93%
[Alliant Reloder-23]*	<<locked>>	91%	27209	55%	**92	90%
[Alliant Reloder-26]*	<<locked>>	94%	32706	66%	**08	90%
Bofors RP3	<<locked>>	81%	35447	72%	**95	96%
[Bofors RP7]*	<<locked>>	86%	38392	78%	**99	90%
[Hodgdon CFE223]*	<<locked>>	81%	37420	76%	**58	94%
[Hodgdon H380]*	<<locked>>	81%	36376	74%	**95	93%
[Hodgdon H414]*	<<locked>>	85%	37014	75%	**48	90%
[Hodgdon H4350]*	<<locked>>	92%	39059	79%	**35	90%
[Hodgdon Hybrid 100V]*	<<locked>>	82%	25918	53%	**07	90%
[Hodgdon LVR]*	<<locked>>	82%	31575	64%	**94	90%
[Hodgdon Superperformance]*	<<locked>>	90%	39552	80%	**17	90%
Hodgdon VARGET	<<locked>>	81%	36419	74%	**72	95%
Hodgdon TrailBoss	<<locked>>	81%	26397	54%	**72	100%
IMR 3031	<<locked>>	81%	39363	80%	**00	100%
IMR 4064	<<locked>>	81%	35810	73%	**46	95%
[IMR 4166 Enduron]*	<<locked>>	82%	36666	74%	**33	90%
[IMR 4350]*	<<locked>>	90%	38522	78%	**18	90%
[IMR 4451 Enduron]*	<<locked>>	84%	37043	75%	**69	90%
[IMR 4831]*	<<locked>>	88%	29515	60%	**44	91%
IMR 4895	<<locked>>	81%	39842	81%	**07	97%
Lovex S062	<<locked>>	81%	38101	77%	**15	98%
[Lovex S065]*	<<locked>>	82%	32634	66%	**61	90%
[Lovex S070]*	<<locked>>	87%	35476	72%	**56	90%
Norma 203B	<<locked>>	81%	38101	77%	**58	96%
[Norma URP]*	<<locked>>	84%	29965	61%	**64	90%
Ramshot Big Game	<<locked>>	81%	37724	76%	**64	96%
[Ramshot Hunter]*	<<locked>>	88%	34824	71%	**95	90%
ReloadSwiss RS 14	<<locked>>	81%	26803	54%	**14	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	37115	75%	**82	91%
ReloadSwiss RS 60	<<locked>>	81%	33025	67%	**15	97%
[ReloadSwiss RS 62]*	<<locked>>	85%	30487	62%	**03	90%
[ReloadSwiss RS 70]*	<<locked>>	87%	33605	68%	**76	90%
Rottweil R 902	<<locked>>	81%	40001	81%	**41	98%
Rottweil R 903	<<locked>>	81%	33069	67%	**26	95%
[Rottweil R 907]*	<<locked>>	86%	38392	78%	**99	90%
SNPE Vectan SP 11	<<locked>>	81%	34389	70%	**85	95%
SNPE Vectan Tubal 5000	<<locked>>	81%	36071	73%	**03	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	86%	35433	72%	**00	90%
[Shooters World Long Rifle]*	<<locked>>	82%	32634	66%	**61	90%
Shooters World Precision	<<locked>>	81%	38101	77%	**15	98%
Somchem S355	<<locked>>	81%	34403	70%	**43	95%
[Somchem S365]*	<<locked>>	81%	24656	50%	**20	91%
Vihtavuori N133	<<locked>>	81%	41350	84%	**18	100%
Vihtavuori N135	<<locked>>	81%	33040	67%	**97	100%
Vihtavuori N140	<<locked>>	81%	39682	80%	**31	100%
Vihtavuori N150	<<locked>>	81%	29124	59%	**85	95%
[Vihtavuori N160]*	<<locked>>	81%	30052	61%	**31	90%
Vihtavuori N540	<<locked>>	81%	39537	80%	**48	99%
[Vihtavuori N550]*	<<locked>>	81%	30182	61%	**71	90%
[Vihtavuori N555]*	<<locked>>	90%	27978	57%	**51	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	29167	59%	**69	93%
[Winchester 760]*	<<locked>>	85%	37014	75%	**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