Load data for .256 Mag. Gibbs + .257 | 90gr | Hammer Absolute Hammer

Recommended Powder(s): ReloadSwiss RS 52, ReloadSwiss RS 60, Somchem S365

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 90gr \| Hammer Absolute Hammer
Manufacturer SKU:	25090AH
Bullet Weight:	90gr \| 5.8g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.050" \| 26.7mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.219" \| 5.6mm
Shank Seated Depth:	0.081" \| 2.1mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B10939_C231
Last updated:	2025-02-02
Recommended Twist Rate:	1:10 - 1:9

Load data for 114 loads in caliber .256 Mag. Gibbs with .257 | 90gr | Hammer Absolute Hammer bullet and 57 powders such as ReloadSwiss RS 52, ReloadSwiss RS 60, 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".
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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Min z (%)
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Safety Buffer (%)
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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>>	86%	43976	89%	**18	97%
[Accurate 2700]*	<<locked>>	87%	44164	90%	**40	92%
Accurate 4064	<<locked>>	86%	43801	89%	**35	100%
Accurate 4350	<<locked>>	95%	44309	90%	**00	96%
Alliant Reloder- TS 15.5	<<locked>>	87%	44034	89%	**54	98%
Alliant Reloder-15	<<locked>>	84%	43642	88%	**48	97%
Alliant Reloder-16	<<locked>>	95%	44237	90%	**20	96%
Alliant Reloder-17	<<locked>>	91%	43918	89%	**43	98%
[Alliant Reloder-23]*	<<locked>>	97%	32953	67%	**38	93%
Hodgdon CFE223	<<locked>>	85%	44367	90%	**91	96%
Hodgdon H380	<<locked>>	86%	43859	89%	**28	95%
[Hodgdon H414]*	<<locked>>	90%	44280	90%	**91	93%
[Hodgdon H4350]*	<<locked>>	96%	44048	89%	**12	92%
Hodgdon Hybrid 100V	<<locked>>	97%	42888	87%	**45	98%
Hodgdon LVR	<<locked>>	92%	43685	89%	**71	95%
Hodgdon VARGET	<<locked>>	87%	44324	90%	**25	97%
Hodgdon TrailBoss	<<locked>>	96%	33185	67%	**88	100%
IMR 3031	<<locked>>	84%	44092	89%	**64	100%
IMR 4064	<<locked>>	87%	43947	89%	**05	97%
[IMR 4166 Enduron]*	<<locked>>	87%	43569	88%	**56	92%
[IMR 4350]*	<<locked>>	94%	43497	88%	**95	92%
[IMR 4451 Enduron]*	<<locked>>	89%	43874	89%	**89	92%
IMR 4831	<<locked>>	97%	40379	82%	**99	95%
IMR 4895	<<locked>>	83%	43830	89%	**61	97%
Lovex S062	<<locked>>	85%	43801	89%	**18	99%
Lovex S065	<<locked>>	91%	44266	90%	**15	95%
[Lovex S070]*	<<locked>>	93%	43990	89%	**25	93%
Norma 203B	<<locked>>	85%	43772	89%	**54	97%
Norma URP	<<locked>>	95%	44367	90%	**04	96%
Ramshot Big Game	<<locked>>	85%	44237	90%	**74	97%
[Ramshot Hunter]*	<<locked>>	95%	44005	89%	**87	94%
ReloadSwiss RS 14	<<locked>>	96%	33562	68%	**34	100%
[ReloadSwiss RS 50]*	<<locked>>	85%	43540	88%	**99	93%
ReloadSwiss RS 52 👍	<<locked>>	85%	43700	89%	**87	99%
ReloadSwiss RS 60 👍	<<locked>>	91%	43526	88%	**46	99%
ReloadSwiss RS 62	<<locked>>	94%	43497	88%	**00	96%
ReloadSwiss RS 70	<<locked>>	95%	44295	90%	**23	95%
Rottweil R 902	<<locked>>	84%	44266	90%	**99	99%
Rottweil R 903	<<locked>>	88%	43598	88%	**45	98%
[Rottweil R 907]*	<<locked>>	90%	43642	88%	**79	92%
SNPE Vectan SP 11	<<locked>>	88%	44063	89%	**84	97%
SNPE Vectan Tubal 5000	<<locked>>	86%	43497	88%	**33	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	92%	44280	90%	**53	93%
Shooters World Long Rifle	<<locked>>	91%	44266	90%	**15	95%
Shooters World Precision	<<locked>>	85%	43801	89%	**18	99%
Somchem S355	<<locked>>	88%	44092	89%	**41	98%
Somchem S365 👍	<<locked>>	97%	42279	86%	**07	99%
Vihtavuori N133	<<locked>>	83%	44121	89%	**43	100%
Vihtavuori N135	<<locked>>	89%	43830	89%	**02	100%
Vihtavuori N140	<<locked>>	84%	43569	88%	**89	100%
Vihtavuori N150	<<locked>>	93%	43598	88%	**05	99%
Vihtavuori N160	<<locked>>	92%	44295	90%	**48	96%
Vihtavuori N540	<<locked>>	84%	44309	90%	**22	100%
Vihtavuori N550	<<locked>>	92%	44164	90%	**94	96%
[Vihtavuori N555]*	<<locked>>	97%	35781	73%	**43	94%
Winchester 6.5 StaBALL	<<locked>>	93%	44048	89%	**22	98%
[Winchester 760]*	<<locked>>	90%	44280	90%	**91	93%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2208	<<locked>>	81%	37304	76%	**58	95%
[Accurate 2700]*	<<locked>>	84%	40161	81%	**54	90%
Accurate 4064	<<locked>>	81%	37724	76%	**04	99%
[Accurate 4350]*	<<locked>>	84%	30255	61%	**40	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	36535	74%	**77	96%
Alliant Reloder-15	<<locked>>	81%	39320	80%	**49	95%
[Alliant Reloder-16]*	<<locked>>	84%	31444	64%	**62	90%
[Alliant Reloder-17]*	<<locked>>	81%	31705	64%	**08	93%
[Alliant Reloder-23]*	<<locked>>	91%	28239	57%	**80	90%
[Hodgdon CFE223]*	<<locked>>	81%	37739	77%	**33	94%
[Hodgdon H380]*	<<locked>>	81%	37304	76%	**81	93%
[Hodgdon H414]*	<<locked>>	86%	38392	78%	**46	90%
[Hodgdon H4350]*	<<locked>>	93%	40785	83%	**33	90%
[Hodgdon Hybrid 100V]*	<<locked>>	82%	27137	55%	**02	90%
[Hodgdon LVR]*	<<locked>>	83%	32692	66%	**89	90%
[Hodgdon VARGET]*	<<locked>>	81%	36840	75%	**44	94%
Hodgdon TrailBoss	<<locked>>	81%	26527	54%	**31	100%
IMR 3031	<<locked>>	81%	39610	80%	**69	100%
[IMR 4064]*	<<locked>>	81%	36318	74%	**25	94%
[IMR 4166 Enduron]*	<<locked>>	82%	37927	77%	**28	90%
[IMR 4350]*	<<locked>>	91%	40248	82%	**30	90%
[IMR 4451 Enduron]*	<<locked>>	84%	38116	77%	**54	90%
[IMR 4831]*	<<locked>>	87%	30066	61%	**17	90%
IMR 4895	<<locked>>	81%	40321	82%	**82	96%
Lovex S062	<<locked>>	81%	38682	78%	**97	97%
[Lovex S065]*	<<locked>>	83%	33997	69%	**62	90%
[Lovex S070]*	<<locked>>	88%	37420	76%	**67	90%
Norma 203B	<<locked>>	81%	38696	78%	**36	96%
[Norma URP]*	<<locked>>	84%	31154	63%	**53	90%
Ramshot Big Game	<<locked>>	81%	38319	78%	**36	95%
[Ramshot Hunter]*	<<locked>>	89%	36071	73%	**90	90%
ReloadSwiss RS 14	<<locked>>	81%	26948	55%	**73	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	37811	77%	**54	91%
ReloadSwiss RS 52	<<locked>>	81%	37608	76%	**46	98%
[ReloadSwiss RS 60]*	<<locked>>	81%	30893	63%	**79	93%
[ReloadSwiss RS 62]*	<<locked>>	85%	31792	64%	**99	90%
[ReloadSwiss RS 70]*	<<locked>>	87%	34824	71%	**67	90%
Rottweil R 902	<<locked>>	81%	40785	83%	**27	98%
Rottweil R 903	<<locked>>	81%	33808	69%	**02	95%
[Rottweil R 907]*	<<locked>>	87%	40364	82%	**07	90%
[SNPE Vectan SP 11]*	<<locked>>	81%	35157	71%	**64	94%
SNPE Vectan Tubal 5000	<<locked>>	81%	36579	74%	**85	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	87%	37333	76%	**08	90%
[Shooters World Long Rifle]*	<<locked>>	83%	33997	69%	**62	90%
Shooters World Precision	<<locked>>	81%	38682	78%	**97	97%
Somchem S355	<<locked>>	81%	35056	71%	**25	95%
[Somchem S365]*	<<locked>>	81%	25237	51%	**89	90%
Vihtavuori N133	<<locked>>	81%	41495	84%	**94	100%
Vihtavuori N135	<<locked>>	81%	33794	69%	**79	100%
Vihtavuori N140	<<locked>>	81%	40103	81%	**17	100%
Vihtavuori N150	<<locked>>	81%	29791	60%	**61	95%
[Vihtavuori N160]*	<<locked>>	81%	31140	63%	**23	90%
Vihtavuori N540	<<locked>>	81%	40001	81%	**33	99%
[Vihtavuori N550]*	<<locked>>	81%	31067	63%	**56	90%
[Vihtavuori N555]*	<<locked>>	91%	29080	59%	**43	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	29791	60%	**51	92%
[Winchester 760]*	<<locked>>	86%	38392	78%	**46	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.