Load data for .256 Mag. Gibbs + .257 | 86gr | Winchester SPRN

Recommended Powder(s): ReloadSwiss RS 52

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 86gr \| Winchester SPRN
Bullet Weight:	86gr \| 5.6g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.000" \| 25.4mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.169" \| 4.3mm
Shank Seated Depth:	0.169" \| 4.3mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B6607_C231
Last updated:	2025-01-01

Load data for 106 loads in caliber .256 Mag. Gibbs with .257 | 86gr | Winchester SPRN bullet and 53 powders such as ReloadSwiss RS 52. 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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Max FR*
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Barrel Length (cm)
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>>	87%	43656	89%	**68	96%
Accurate 4064	<<locked>>	87%	44251	90%	**10	100%
Accurate 4350	<<locked>>	95%	43758	89%	**40	95%
Alliant Reloder- TS 15.5	<<locked>>	87%	43642	88%	**04	98%
Alliant Reloder-15	<<locked>>	85%	44179	90%	**17	96%
Alliant Reloder-16	<<locked>>	96%	43845	89%	**59	96%
Alliant Reloder-17	<<locked>>	92%	44280	90%	**09	98%
[Alliant Reloder-23]*	<<locked>>	96%	32082	65%	**51	92%
Hodgdon CFE223	<<locked>>	86%	44077	89%	**43	96%
Hodgdon H380	<<locked>>	87%	44367	90%	**07	95%
[Hodgdon H414]*	<<locked>>	90%	43772	89%	**27	92%
Hodgdon Hybrid 100V	<<locked>>	97%	41408	84%	**61	97%
Hodgdon LVR	<<locked>>	93%	43976	89%	**36	95%
Hodgdon VARGET	<<locked>>	88%	44164	90%	**77	96%
Hodgdon TrailBoss	<<locked>>	96%	33112	67%	**34	100%
IMR 3031	<<locked>>	85%	43801	89%	**23	100%
IMR 4064	<<locked>>	88%	43685	89%	**58	96%
[IMR 4166 Enduron]*	<<locked>>	88%	44338	90%	**25	92%
[IMR 4451 Enduron]*	<<locked>>	90%	44309	90%	**58	92%
[IMR 4831]*	<<locked>>	97%	38885	79%	**12	94%
IMR 4895	<<locked>>	84%	43468	88%	**10	97%
Lovex S062	<<locked>>	85%	43526	88%	**71	98%
[Lovex S065]*	<<locked>>	92%	43816	89%	**58	94%
[Lovex S070]*	<<locked>>	93%	43627	88%	**68	92%
Norma 203B	<<locked>>	86%	44295	90%	**20	97%
Norma URP	<<locked>>	95%	43845	89%	**43	95%
Ramshot Big Game	<<locked>>	86%	43801	89%	**30	97%
[Ramshot Hunter]*	<<locked>>	96%	43613	88%	**36	93%
ReloadSwiss RS 14	<<locked>>	97%	33881	69%	**93	100%
[ReloadSwiss RS 50]*	<<locked>>	86%	44121	89%	**61	93%
ReloadSwiss RS 52 👍	<<locked>>	86%	44063	89%	**63	99%
ReloadSwiss RS 60	<<locked>>	92%	44077	89%	**15	98%
ReloadSwiss RS 62	<<locked>>	95%	43555	88%	**59	95%
[ReloadSwiss RS 70]*	<<locked>>	95%	43903	89%	**69	94%
Rottweil R 902	<<locked>>	84%	44092	89%	**58	98%
Rottweil R 903	<<locked>>	90%	44121	89%	**17	98%
SNPE Vectan SP 11	<<locked>>	88%	43642	88%	**27	97%
SNPE Vectan Tubal 5000	<<locked>>	88%	44179	90%	**05	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	92%	43758	89%	**05	92%
[Shooters World Long Rifle]*	<<locked>>	92%	43816	89%	**58	94%
Shooters World Precision	<<locked>>	85%	43526	88%	**71	98%
Somchem S355	<<locked>>	89%	43685	89%	**91	97%
Somchem S365	<<locked>>	97%	41017	83%	**27	98%
Vihtavuori N133	<<locked>>	84%	44019	89%	**05	100%
Vihtavuori N135	<<locked>>	91%	44353	90%	**74	100%
Vihtavuori N140	<<locked>>	85%	44324	90%	**64	100%
Vihtavuori N150	<<locked>>	94%	44092	89%	**68	99%
Vihtavuori N160	<<locked>>	93%	44324	90%	**10	95%
Vihtavuori N540	<<locked>>	85%	43947	89%	**74	100%
Vihtavuori N550	<<locked>>	92%	43497	88%	**30	95%
[Vihtavuori N555]*	<<locked>>	97%	34476	70%	**63	93%
Winchester 6.5 StaBALL	<<locked>>	93%	43555	88%	**68	98%
[Winchester 760]*	<<locked>>	90%	43772	89%	**27	92%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AR 2208]*	<<locked>>	81%	36376	74%	**90	94%
Accurate 4064	<<locked>>	81%	36564	74%	**33	99%
[Accurate 4350]*	<<locked>>	86%	31256	63%	**25	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	35534	72%	**10	95%
Alliant Reloder-15	<<locked>>	81%	38348	78%	**82	95%
[Alliant Reloder-16]*	<<locked>>	87%	33199	67%	**71	90%
[Alliant Reloder-17]*	<<locked>>	81%	30879	63%	**28	91%
[Alliant Reloder-23]*	<<locked>>	94%	29530	60%	**66	90%
[Hodgdon CFE223]*	<<locked>>	81%	36883	75%	**59	93%
[Hodgdon H380]*	<<locked>>	81%	36216	73%	**07	92%
[Hodgdon H414]*	<<locked>>	87%	39479	80%	**31	90%
[Hodgdon Hybrid 100V]*	<<locked>>	84%	28036	57%	**84	90%
[Hodgdon LVR]*	<<locked>>	85%	33794	69%	**74	90%
[Hodgdon VARGET]*	<<locked>>	81%	36056	73%	**81	93%
Hodgdon TrailBoss	<<locked>>	81%	26513	54%	**73	100%
IMR 3031	<<locked>>	81%	38493	78%	**09	100%
[IMR 4064]*	<<locked>>	81%	35418	72%	**58	93%
[IMR 4166 Enduron]*	<<locked>>	84%	39407	80%	**17	90%
[IMR 4451 Enduron]*	<<locked>>	87%	40176	81%	**63	90%
[IMR 4831]*	<<locked>>	90%	31662	64%	**18	90%
IMR 4895	<<locked>>	81%	39189	79%	**12	96%
Lovex S062	<<locked>>	81%	37652	76%	**30	97%
[Lovex S065]*	<<locked>>	85%	35143	71%	**41	90%
[Lovex S070]*	<<locked>>	90%	38580	78%	**49	90%
Norma 203B	<<locked>>	81%	37608	76%	**66	95%
[Norma URP]*	<<locked>>	86%	32111	65%	**38	90%
[Ramshot Big Game]*	<<locked>>	81%	37289	76%	**63	94%
[Ramshot Hunter]*	<<locked>>	91%	37826	77%	**79	90%
ReloadSwiss RS 14	<<locked>>	81%	26484	54%	**06	100%
[ReloadSwiss RS 50]*	<<locked>>	82%	37521	76%	**00	90%
ReloadSwiss RS 52	<<locked>>	81%	36390	74%	**72	97%
[ReloadSwiss RS 60]*	<<locked>>	81%	29994	61%	**05	92%
[ReloadSwiss RS 62]*	<<locked>>	87%	32866	67%	**84	90%
[ReloadSwiss RS 70]*	<<locked>>	90%	36550	74%	**72	90%
Rottweil R 902	<<locked>>	81%	39755	81%	**63	97%
[Rottweil R 903]*	<<locked>>	81%	32764	66%	**25	94%
[SNPE Vectan SP 11]*	<<locked>>	81%	34113	69%	**87	93%
SNPE Vectan Tubal 5000	<<locked>>	81%	35694	72%	**25	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	89%	38551	78%	**90	90%
[Shooters World Long Rifle]*	<<locked>>	85%	35143	71%	**41	90%
Shooters World Precision	<<locked>>	81%	37652	76%	**30	97%
[Somchem S355]*	<<locked>>	81%	34069	69%	**51	94%
[Somchem S365]*	<<locked>>	83%	26107	53%	**74	90%
Vihtavuori N133	<<locked>>	81%	40437	82%	**36	100%
Vihtavuori N135	<<locked>>	81%	32764	66%	**02	99%
Vihtavuori N140	<<locked>>	81%	39044	79%	**43	99%
[Vihtavuori N150]*	<<locked>>	81%	28964	59%	**90	94%
[Vihtavuori N160]*	<<locked>>	84%	32518	66%	**08	90%
Vihtavuori N540	<<locked>>	81%	38914	79%	**69	99%
[Vihtavuori N550]*	<<locked>>	83%	32648	66%	**54	90%
[Vihtavuori N555]*	<<locked>>	93%	30530	62%	**41	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	28950	59%	**67	91%
[Winchester 760]*	<<locked>>	87%	39479	80%	**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.