Load data for .256 Mag. Gibbs + .257 | 85gr | Barnes X

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

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 85gr \| Barnes X
Manufacturer SKU:	25705
Bullet Weight:	85gr \| 5.5g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	0.980" \| 24.9mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.149" \| 3.8mm
Shank Seated Depth:	0.149" \| 3.8mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B491_C231
Last updated:	2025-01-01

Load data for 84 loads in caliber .256 Mag. Gibbs with .257 | 85gr | Barnes X bullet and 42 powders such as ReloadSwiss RS 52, 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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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%	43787	89%	**64	96%
Accurate 4350	<<locked>>	92%	43627	88%	**40	95%
Alliant Reloder- TS 15.5	<<locked>>	84%	43584	88%	**94	98%
Alliant Reloder-16	<<locked>>	93%	43598	88%	**53	95%
Alliant Reloder-17	<<locked>>	89%	44150	90%	**96	97%
Alliant Reloder-23	<<locked>>	97%	36651	74%	**89	95%
[Alliant Reloder-26]*	<<locked>>	97%	39856	81%	**14	92%
Hodgdon CFE223	<<locked>>	83%	43845	89%	**27	95%
Hodgdon H380	<<locked>>	83%	43700	89%	**84	95%
[Hodgdon H414]*	<<locked>>	88%	43961	89%	**30	92%
Hodgdon Hybrid 100V	<<locked>>	95%	43743	89%	**07	97%
Hodgdon LVR	<<locked>>	90%	43990	89%	**36	95%
Hodgdon VARGET	<<locked>>	85%	44353	90%	**74	96%
Hodgdon TrailBoss	<<locked>>	96%	33750	68%	**47	100%
IMR 4064	<<locked>>	85%	44150	90%	**58	96%
[IMR 4166 Enduron]*	<<locked>>	85%	43642	88%	**02	92%
[IMR 4451 Enduron]*	<<locked>>	87%	43598	88%	**28	91%
IMR 4831	<<locked>>	96%	43439	88%	**10	95%
[Lovex S065]*	<<locked>>	89%	44106	89%	**54	94%
[Lovex S070]*	<<locked>>	90%	44150	90%	**71	92%
Norma URP	<<locked>>	92%	44106	89%	**46	95%
[Ramshot Hunter]*	<<locked>>	93%	44034	89%	**30	93%
ReloadSwiss RS 14	<<locked>>	96%	34301	70%	**93	100%
[ReloadSwiss RS 50]*	<<locked>>	83%	43932	89%	**51	93%
ReloadSwiss RS 52 👍	<<locked>>	83%	44179	90%	**46	99%
ReloadSwiss RS 60	<<locked>>	89%	43584	88%	**02	98%
ReloadSwiss RS 62	<<locked>>	92%	44048	89%	**56	95%
[ReloadSwiss RS 70]*	<<locked>>	92%	43830	89%	**53	94%
Rottweil R 903	<<locked>>	86%	44338	90%	**07	98%
SNPE Vectan SP 11	<<locked>>	86%	44251	90%	**36	97%
SNPE Vectan Tubal 5000	<<locked>>	85%	44164	90%	**95	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	89%	43772	89%	**95	92%
[Shooters World Long Rifle]*	<<locked>>	89%	44106	89%	**54	94%
Somchem S355	<<locked>>	85%	43758	89%	**81	97%
Somchem S365 👍	<<locked>>	95%	43729	89%	**82	99%
Vihtavuori N135	<<locked>>	87%	44382	90%	**64	100%
Vihtavuori N150	<<locked>>	91%	43816	89%	**54	99%
Vihtavuori N160	<<locked>>	90%	44106	89%	**91	95%
Vihtavuori N550	<<locked>>	89%	43540	88%	**30	95%
Vihtavuori N555	<<locked>>	97%	39189	79%	**77	95%
Winchester 6.5 StaBALL	<<locked>>	91%	43758	89%	**61	97%
[Winchester 760]*	<<locked>>	88%	43961	89%	**30	92%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2208	<<locked>>	81%	40089	81%	**72	95%
[Accurate 4350]*	<<locked>>	82%	32039	65%	**28	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	39726	81%	**95	97%
[Alliant Reloder-16]*	<<locked>>	83%	33214	67%	**58	90%
[Alliant Reloder-17]*	<<locked>>	81%	34708	70%	**36	94%
[Alliant Reloder-23]*	<<locked>>	90%	30211	61%	**76	90%
[Alliant Reloder-26]*	<<locked>>	94%	36419	74%	**09	90%
[Hodgdon CFE223]*	<<locked>>	81%	40669	82%	**58	94%
[Hodgdon H380]*	<<locked>>	81%	40654	82%	**09	94%
[Hodgdon H414]*	<<locked>>	85%	40074	81%	**31	90%
[Hodgdon Hybrid 100V]*	<<locked>>	81%	29109	59%	**97	91%
[Hodgdon LVR]*	<<locked>>	82%	34693	70%	**87	90%
Hodgdon VARGET	<<locked>>	81%	39755	81%	**63	95%
Hodgdon TrailBoss	<<locked>>	81%	27195	55%	**86	100%
IMR 4064	<<locked>>	81%	39262	80%	**46	95%
[IMR 4166 Enduron]*	<<locked>>	81%	39755	81%	**13	90%
[IMR 4451 Enduron]*	<<locked>>	84%	40741	83%	**59	90%
[IMR 4831]*	<<locked>>	85%	31589	64%	**02	90%
[Lovex S065]*	<<locked>>	81%	35447	72%	**28	90%
[Lovex S070]*	<<locked>>	86%	38899	79%	**43	90%
[Norma URP]*	<<locked>>	82%	32735	66%	**38	90%
[Ramshot Hunter]*	<<locked>>	88%	37579	76%	**72	90%
ReloadSwiss RS 14	<<locked>>	81%	27731	56%	**36	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	40828	83%	**72	91%
ReloadSwiss RS 52	<<locked>>	81%	40712	83%	**71	98%
[ReloadSwiss RS 60]*	<<locked>>	81%	34011	69%	**27	94%
[ReloadSwiss RS 62]*	<<locked>>	83%	33301	68%	**81	90%
[ReloadSwiss RS 70]*	<<locked>>	86%	36811	75%	**63	90%
Rottweil R 903	<<locked>>	81%	37985	77%	**53	96%
SNPE Vectan SP 11	<<locked>>	81%	37985	77%	**82	95%
SNPE Vectan Tubal 5000	<<locked>>	81%	39624	80%	**00	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	85%	39175	79%	**90	90%
[Shooters World Long Rifle]*	<<locked>>	81%	35447	72%	**28	90%
Somchem S355	<<locked>>	81%	38363	78%	**56	96%
[Somchem S365]*	<<locked>>	81%	28587	58%	**43	92%
Vihtavuori N135	<<locked>>	81%	37333	76%	**07	100%
Vihtavuori N150	<<locked>>	81%	33112	67%	**95	96%
[Vihtavuori N160]*	<<locked>>	81%	33837	69%	**35	91%
[Vihtavuori N550]*	<<locked>>	81%	34243	69%	**87	91%
[Vihtavuori N555]*	<<locked>>	88%	30908	63%	**31	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	32619	66%	**66	93%
[Winchester 760]*	<<locked>>	85%	40074	81%	**31	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