Load data for .256 Mag. Gibbs + .257 | 100gr | Nosler Partition SP

Recommended Powder(s):

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 100gr \| Nosler Partition SP
Manufacturer SKU:	16317
Bullet Weight:	100gr \| 6.5g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.035" \| 26.3mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.204" \| 5.2mm
Shank Seated Depth:	0.204" \| 5.2mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B4002_C231
Last updated:	2025-01-01

Load data for 104 loads in caliber .256 Mag. Gibbs with .257 | 100gr | Nosler Partition SP bullet and 52 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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Muzzle velocity vs. barrel length
Every 1 inch additional barrel length increases muzzle velocity by approx. 34.9 fps
C.O.L. (Inch)
C.O.L. (mm)
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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.
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>>	84%	44106	89%	**87	98%
[ADI AR 2209]*	<<locked>>	96%	44353	90%	**36	91%
[Accurate 2700]*	<<locked>>	85%	44222	90%	**18	93%
[Accurate 3100]*	<<locked>>	97%	37507	76%	**85	93%
Accurate 4350	<<locked>>	92%	43932	89%	**63	97%
Alliant Reloder- TS 15.5 👍	<<locked>>	84%	44005	89%	**13	99%
Alliant Reloder-16	<<locked>>	92%	44280	90%	**02	98%
Alliant Reloder-17 👍	<<locked>>	88%	44222	90%	**25	99%
[Alliant Reloder-19]*	<<locked>>	97%	43947	89%	**43	92%
Alliant Reloder-23	<<locked>>	97%	36521	74%	**31	97%
Alliant Reloder-26	<<locked>>	97%	40161	81%	**69	96%
Hodgdon H380	<<locked>>	84%	43990	89%	**07	97%
[Hodgdon H414]*	<<locked>>	87%	43772	89%	**46	94%
[Hodgdon H4350]*	<<locked>>	93%	43743	89%	**87	93%
Hodgdon Hybrid 100V 👍	<<locked>>	95%	44077	89%	**40	99%
Hodgdon LVR	<<locked>>	89%	43801	89%	**43	96%
[Hodgdon Superperformance]*	<<locked>>	90%	44280	90%	**79	94%
Hodgdon VARGET	<<locked>>	84%	44106	89%	**87	98%
Hodgdon TrailBoss	<<locked>>	96%	33634	68%	**96	100%
IMR 4064	<<locked>>	84%	43642	88%	**71	98%
[IMR 4166 Enduron]*	<<locked>>	85%	43874	89%	**44	94%
[IMR 4350]*	<<locked>>	91%	43656	89%	**81	93%
[IMR 4451 Enduron]*	<<locked>>	86%	43584	88%	**61	94%
IMR 4831	<<locked>>	96%	43497	88%	**33	97%
Lovex S065	<<locked>>	89%	43845	89%	**74	96%
Lovex S070	<<locked>>	90%	44121	89%	**97	95%
[Norma MRP]*	<<locked>>	97%	40103	81%	**30	92%
Norma URP	<<locked>>	92%	43801	89%	**59	97%
Ramshot Hunter	<<locked>>	92%	43888	89%	**56	95%
ReloadSwiss RS 14	<<locked>>	96%	34098	69%	**39	100%
ReloadSwiss RS 50	<<locked>>	83%	43976	89%	**81	95%
ReloadSwiss RS 60 👍	<<locked>>	89%	43801	89%	**31	100%
ReloadSwiss RS 62	<<locked>>	92%	43743	89%	**79	97%
ReloadSwiss RS 70	<<locked>>	92%	43540	88%	**86	96%
Rottweil R 903	<<locked>>	86%	43758	89%	**13	99%
[Rottweil R 905]*	<<locked>>	97%	42714	87%	**23	92%
[Rottweil R 907]*	<<locked>>	87%	43627	88%	**64	93%
SNPE Vectan SP 11	<<locked>>	85%	43830	89%	**46	98%
SNPE Vectan Tubal 5000	<<locked>>	84%	43976	89%	**05	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	89%	43555	88%	**18	94%
Shooters World Long Rifle	<<locked>>	89%	43845	89%	**74	96%
Somchem S355	<<locked>>	85%	43656	89%	**00	99%
Somchem S365 👍	<<locked>>	95%	43700	89%	**02	100%
[Somchem S385]*	<<locked>>	97%	43062	87%	**04	93%
Vihtavuori N135	<<locked>>	87%	43830	89%	**54	100%
Vihtavuori N150	<<locked>>	91%	44193	90%	**74	100%
Vihtavuori N160	<<locked>>	89%	43685	89%	**10	97%
Vihtavuori N550	<<locked>>	88%	43540	88%	**49	97%
Vihtavuori N555	<<locked>>	96%	38943	79%	**94	97%
Winchester 6.5 StaBALL	<<locked>>	90%	44092	89%	**97	99%
[Winchester 760]*	<<locked>>	87%	43772	89%	**46	94%
Winchester StaBALL HD	<<locked>>	97%	32227	65%	**79	95%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2208	<<locked>>	81%	39769	81%	**92	97%
[ADI AR 2209]*	<<locked>>	94%	40901	83%	**61	90%
[Accurate 2700]*	<<locked>>	81%	38276	78%	**94	91%
[Accurate 3100]*	<<locked>>	92%	31444	64%	**35	90%
[Accurate 4350]*	<<locked>>	81%	30240	61%	**28	92%
Alliant Reloder- TS 15.5	<<locked>>	81%	39813	81%	**28	98%
[Alliant Reloder-16]*	<<locked>>	81%	30777	62%	**35	92%
Alliant Reloder-17	<<locked>>	81%	34534	70%	**79	96%
[Alliant Reloder-19]*	<<locked>>	94%	40611	82%	**71	90%
[Alliant Reloder-23]*	<<locked>>	86%	26078	53%	**93	90%
[Alliant Reloder-26]*	<<locked>>	89%	30618	62%	**97	90%
Hodgdon H380	<<locked>>	81%	40596	82%	**38	96%
[Hodgdon H414]*	<<locked>>	81%	35549	72%	**56	91%
[Hodgdon H4350]*	<<locked>>	87%	36550	74%	**13	90%
[Hodgdon Hybrid 100V]*	<<locked>>	81%	28442	58%	**46	93%
[Hodgdon LVR]*	<<locked>>	81%	33504	68%	**94	92%
[Hodgdon Superperformance]*	<<locked>>	85%	36941	75%	**02	90%
Hodgdon VARGET	<<locked>>	81%	39769	81%	**92	97%
Hodgdon TrailBoss	<<locked>>	81%	26934	55%	**42	100%
IMR 4064	<<locked>>	81%	39262	80%	**72	97%
[IMR 4166 Enduron]*	<<locked>>	81%	39015	79%	**33	92%
[IMR 4350]*	<<locked>>	85%	35708	72%	**97	90%
[IMR 4451 Enduron]*	<<locked>>	81%	37173	75%	**13	91%
[IMR 4831]*	<<locked>>	82%	27195	55%	**13	90%
[Lovex S065]*	<<locked>>	81%	34258	69%	**54	92%
[Lovex S070]*	<<locked>>	82%	33910	69%	**57	90%
[Norma MRP]*	<<locked>>	94%	37086	75%	**48	90%
[Norma URP]*	<<locked>>	81%	30647	62%	**31	92%
[Ramshot Hunter]*	<<locked>>	83%	32503	66%	**71	90%
ReloadSwiss RS 14	<<locked>>	81%	27427	56%	**85	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	40596	82%	**05	94%
ReloadSwiss RS 60	<<locked>>	81%	33591	68%	**69	97%
[ReloadSwiss RS 62]*	<<locked>>	81%	30066	61%	**35	91%
[ReloadSwiss RS 70]*	<<locked>>	82%	31763	64%	**64	90%
Rottweil R 903	<<locked>>	81%	37086	75%	**62	97%
[Rottweil R 905]*	<<locked>>	94%	39305	80%	**41	90%
[Rottweil R 907]*	<<locked>>	82%	36187	73%	**84	90%
SNPE Vectan SP 11	<<locked>>	81%	38014	77%	**15	97%
SNPE Vectan Tubal 5000	<<locked>>	81%	39508	80%	**17	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	81%	33779	69%	**98	90%
[Shooters World Long Rifle]*	<<locked>>	81%	34258	69%	**54	92%
Somchem S355	<<locked>>	81%	37652	76%	**62	97%
[Somchem S365]*	<<locked>>	81%	27630	56%	**69	94%
[Somchem S385]*	<<locked>>	91%	35839	73%	**36	90%
Vihtavuori N135	<<locked>>	81%	36782	75%	**13	100%
Vihtavuori N150	<<locked>>	81%	32184	65%	**05	97%
[Vihtavuori N160]*	<<locked>>	81%	33330	68%	**64	93%
[Vihtavuori N550]*	<<locked>>	81%	33968	69%	**13	93%
[Vihtavuori N555]*	<<locked>>	85%	26658	54%	**43	90%
Winchester 6.5 StaBALL	<<locked>>	81%	32227	65%	**12	95%
[Winchester 760]*	<<locked>>	81%	35549	72%	**56	91%
[Winchester StaBALL HD]*	<<locked>>	91%	27093	55%	**85	91%

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