Load data for .256 Mag. Gibbs + .257 | 87gr | Berger Target FB

Recommended Powder(s): ReloadSwiss RS 52

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 87gr \| Berger Target FB
Manufacturer SKU:	25407
Bullet Weight:	87gr \| 5.6g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	0.965" \| 24.5mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.134" \| 3.4mm
Shank Seated Depth:	0.134" \| 3.4mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B976_C231
Last updated:	2025-01-01

Load data for 108 loads in caliber .256 Mag. Gibbs with .257 | 87gr | Berger Target FB bullet and 54 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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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%	44338	90%	**68	97%
Accurate 4064	<<locked>>	86%	44121	89%	**91	100%
Accurate 4350	<<locked>>	95%	44280	90%	**50	96%
Alliant Reloder- TS 15.5	<<locked>>	87%	44193	90%	**00	98%
Alliant Reloder-15	<<locked>>	85%	43845	89%	**97	97%
Alliant Reloder-16	<<locked>>	95%	43947	89%	**63	96%
Alliant Reloder-17	<<locked>>	91%	43859	89%	**89	98%
[Alliant Reloder-23]*	<<locked>>	97%	33083	67%	**84	93%
Hodgdon CFE223	<<locked>>	85%	44034	89%	**30	96%
Hodgdon H380	<<locked>>	86%	44266	90%	**91	95%
[Hodgdon H414]*	<<locked>>	90%	43874	89%	**27	92%
[Hodgdon H4350]*	<<locked>>	96%	44208	90%	**61	91%
Hodgdon Hybrid 100V	<<locked>>	97%	43062	87%	**94	97%
Hodgdon LVR	<<locked>>	92%	43758	89%	**20	95%
Hodgdon VARGET	<<locked>>	87%	43976	89%	**61	96%
Hodgdon TrailBoss	<<locked>>	95%	32822	67%	**18	100%
IMR 3031	<<locked>>	84%	43540	88%	**07	100%
IMR 4064	<<locked>>	88%	44222	90%	**58	97%
[IMR 4166 Enduron]*	<<locked>>	87%	43976	89%	**09	92%
[IMR 4451 Enduron]*	<<locked>>	89%	43947	89%	**41	92%
IMR 4831	<<locked>>	97%	40408	82%	**35	95%
IMR 4895	<<locked>>	84%	44077	89%	**10	97%
Lovex S062	<<locked>>	85%	44106	89%	**71	98%
[Lovex S065]*	<<locked>>	91%	43540	88%	**38	94%
[Lovex S070]*	<<locked>>	93%	43714	89%	**54	92%
Norma 203B	<<locked>>	85%	43961	89%	**00	97%
Norma URP	<<locked>>	95%	43976	89%	**43	96%
Ramshot Big Game	<<locked>>	85%	43816	89%	**14	97%
[Ramshot Hunter]*	<<locked>>	95%	44005	89%	**30	93%
ReloadSwiss RS 14	<<locked>>	95%	33185	67%	**67	100%
[ReloadSwiss RS 50]*	<<locked>>	86%	43729	89%	**41	93%
ReloadSwiss RS 52 👍	<<locked>>	86%	43743	89%	**40	99%
ReloadSwiss RS 60	<<locked>>	91%	43627	88%	**92	98%
ReloadSwiss RS 62	<<locked>>	95%	44367	90%	**73	96%
[ReloadSwiss RS 70]*	<<locked>>	94%	43888	89%	**56	94%
Rottweil R 902	<<locked>>	84%	43714	89%	**35	98%
Rottweil R 903	<<locked>>	89%	44280	90%	**04	98%
SNPE Vectan SP 11	<<locked>>	88%	44150	90%	**33	97%
SNPE Vectan Tubal 5000	<<locked>>	87%	43816	89%	**86	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	91%	43656	89%	**89	92%
[Shooters World Long Rifle]*	<<locked>>	91%	43540	88%	**38	94%
Shooters World Precision	<<locked>>	85%	44106	89%	**71	98%
Somchem S355	<<locked>>	89%	44237	90%	**87	98%
Somchem S365	<<locked>>	96%	41466	84%	**33	98%
Vihtavuori N133	<<locked>>	83%	43743	89%	**89	100%
Vihtavuori N135	<<locked>>	90%	44193	90%	**58	100%
Vihtavuori N140	<<locked>>	84%	44005	89%	**45	100%
Vihtavuori N150	<<locked>>	94%	43845	89%	**51	99%
Vihtavuori N160	<<locked>>	92%	43918	89%	**91	96%
Vihtavuori N540	<<locked>>	84%	43598	88%	**54	100%
Vihtavuori N550	<<locked>>	92%	44164	90%	**40	96%
[Vihtavuori N555]*	<<locked>>	97%	35056	71%	**66	93%
Winchester 6.5 StaBALL	<<locked>>	93%	44019	89%	**64	98%
[Winchester 760]*	<<locked>>	90%	43874	89%	**27	92%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AR 2208]*	<<locked>>	81%	37014	75%	**97	94%
Accurate 4064	<<locked>>	81%	37492	76%	**43	99%
[Accurate 4350]*	<<locked>>	85%	31183	63%	**18	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	36056	73%	**10	96%
Alliant Reloder-15	<<locked>>	81%	38928	79%	**86	95%
[Alliant Reloder-16]*	<<locked>>	85%	32068	65%	**25	90%
[Alliant Reloder-17]*	<<locked>>	81%	31285	63%	**31	92%
[Alliant Reloder-23]*	<<locked>>	92%	28906	59%	**43	90%
[Hodgdon CFE223]*	<<locked>>	81%	37333	76%	**72	93%
[Hodgdon H380]*	<<locked>>	81%	36724	74%	**07	92%
[Hodgdon H414]*	<<locked>>	86%	38943	79%	**09	90%
[Hodgdon H4350]*	<<locked>>	94%	41002	83%	**86	90%
[Hodgdon Hybrid 100V]*	<<locked>>	84%	27876	57%	**67	90%
[Hodgdon LVR]*	<<locked>>	84%	33518	68%	**54	90%
[Hodgdon VARGET]*	<<locked>>	81%	36695	74%	**87	94%
Hodgdon TrailBoss	<<locked>>	81%	26295	53%	**57	100%
IMR 3031	<<locked>>	81%	39218	80%	**12	100%
[IMR 4064]*	<<locked>>	81%	35969	73%	**64	94%
[IMR 4166 Enduron]*	<<locked>>	83%	39102	79%	**90	90%
[IMR 4451 Enduron]*	<<locked>>	85%	39218	80%	**20	90%
[IMR 4831]*	<<locked>>	89%	30748	62%	**82	90%
IMR 4895	<<locked>>	81%	39769	81%	**15	96%
Lovex S062	<<locked>>	81%	38363	78%	**36	97%
[Lovex S065]*	<<locked>>	84%	35085	71%	**28	90%
[Lovex S070]*	<<locked>>	89%	38000	77%	**20	90%
Norma 203B	<<locked>>	81%	38174	77%	**66	95%
[Norma URP]*	<<locked>>	85%	31662	64%	**08	90%
Ramshot Big Game	<<locked>>	81%	38101	77%	**82	95%
[Ramshot Hunter]*	<<locked>>	90%	36999	75%	**49	90%
ReloadSwiss RS 14	<<locked>>	81%	26687	54%	**06	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	37478	76%	**87	90%
ReloadSwiss RS 52	<<locked>>	81%	36970	75%	**72	97%
[ReloadSwiss RS 60]*	<<locked>>	81%	30603	62%	**05	92%
[ReloadSwiss RS 62]*	<<locked>>	86%	32663	66%	**61	90%
[ReloadSwiss RS 70]*	<<locked>>	89%	35984	73%	**46	90%
Rottweil R 902	<<locked>>	81%	40350	82%	**66	98%
[Rottweil R 903]*	<<locked>>	81%	33692	68%	**41	94%
[SNPE Vectan SP 11]*	<<locked>>	81%	34722	70%	**94	94%
SNPE Vectan Tubal 5000	<<locked>>	81%	36245	74%	**25	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	88%	38319	78%	**71	90%
[Shooters World Long Rifle]*	<<locked>>	84%	35085	71%	**28	90%
Shooters World Precision	<<locked>>	81%	38363	78%	**36	97%
Somchem S355	<<locked>>	81%	34606	70%	**54	95%
[Somchem S365]*	<<locked>>	82%	25512	52%	**31	90%
Vihtavuori N133	<<locked>>	81%	41191	84%	**30	100%
Vihtavuori N135	<<locked>>	81%	33402	68%	**08	99%
Vihtavuori N140	<<locked>>	81%	39610	80%	**43	99%
[Vihtavuori N150]*	<<locked>>	81%	29472	60%	**94	94%
[Vihtavuori N160]*	<<locked>>	82%	31633	64%	**79	90%
Vihtavuori N540	<<locked>>	81%	39450	80%	**69	99%
[Vihtavuori N550]*	<<locked>>	82%	31894	65%	**15	90%
[Vihtavuori N555]*	<<locked>>	92%	29849	61%	**99	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	29370	60%	**71	92%
[Winchester 760]*	<<locked>>	86%	38943	79%	**09	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.