Load data for .256 Mag. Gibbs + .257 | 100gr | Rhino Penetrator

Recommended Powder(s): Alliant Reloder-17, Hodgdon Hybrid 100V, ReloadSwiss RS 60, Rottweil R 903, Somchem S365

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 100gr \| Rhino Penetrator
Bullet Weight:	100gr \| 6.5g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.072" \| 27.2mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.241" \| 6.1mm
Shank Seated Depth:	0.241" \| 6.1mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B5293_C231
Last updated:	2025-01-01

Load data for 108 loads in caliber .256 Mag. Gibbs with .257 | 100gr | Rhino Penetrator bullet and 54 powders such as Alliant Reloder-17, Hodgdon Hybrid 100V, ReloadSwiss RS 60, Rottweil R 903, 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".

Go to the bottom of the "My Account " page to set the measure system (imperial vs. metric)
No data yet
C.O.L. (Inch)
C.O.L. (mm)
Case Length (Inch)
Case Length (mm)
CaseCapacity (GoW)
Min z (%)
Min FR (%)
Max FR*
Barrel Length (Inch)
Barrel Length (cm)
Safety Buffer (%)
.
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>>	84%	43845	89%	**77	98%
[Accurate 2700]*	<<locked>>	85%	43918	89%	**12	93%
[Accurate 3100]*	<<locked>>	97%	37289	76%	**85	93%
Accurate 4064	<<locked>>	84%	44367	90%	**04	100%
Accurate 4350	<<locked>>	92%	43772	89%	**59	97%
Alliant Reloder- TS 15.5	<<locked>>	84%	43874	89%	**07	99%
Alliant Reloder-16	<<locked>>	93%	44092	89%	**86	97%
Alliant Reloder-17 👍	<<locked>>	88%	43540	88%	**99	99%
[Alliant Reloder-19]*	<<locked>>	97%	44034	89%	**46	92%
Alliant Reloder-23	<<locked>>	96%	35505	72%	**02	96%
Alliant Reloder-26	<<locked>>	97%	40045	81%	**72	95%
Hodgdon CFE223	<<locked>>	83%	44367	90%	**59	97%
Hodgdon H380	<<locked>>	84%	44164	90%	**10	97%
[Hodgdon H414]*	<<locked>>	87%	43990	89%	**49	94%
[Hodgdon H4350]*	<<locked>>	93%	43584	88%	**81	93%
Hodgdon Hybrid 100V 👍	<<locked>>	95%	44309	90%	**43	99%
Hodgdon LVR	<<locked>>	89%	43729	89%	**43	96%
[Hodgdon Superperformance]*	<<locked>>	90%	44092	89%	**63	93%
Hodgdon VARGET	<<locked>>	85%	44353	90%	**87	98%
Hodgdon TrailBoss	<<locked>>	96%	33576	68%	**90	100%
IMR 4064	<<locked>>	85%	43453	88%	**64	98%
[IMR 4166 Enduron]*	<<locked>>	85%	43772	89%	**38	94%
[IMR 4350]*	<<locked>>	92%	43874	89%	**84	93%
[IMR 4451 Enduron]*	<<locked>>	87%	44367	90%	**74	94%
IMR 4831	<<locked>>	97%	44135	90%	**46	97%
Lovex S065	<<locked>>	89%	43497	88%	**64	96%
[Lovex S070]*	<<locked>>	91%	43947	89%	**94	94%
[Norma 204]*	<<locked>>	92%	44208	90%	**20	91%
[Norma MRP]*	<<locked>>	97%	40103	81%	**20	92%
Norma URP	<<locked>>	92%	43758	89%	**49	97%
Ramshot Hunter	<<locked>>	93%	43772	89%	**53	95%
ReloadSwiss RS 14	<<locked>>	96%	34026	69%	**32	100%
ReloadSwiss RS 50	<<locked>>	83%	43758	89%	**74	95%
ReloadSwiss RS 52	<<locked>>	83%	44208	90%	**53	100%
ReloadSwiss RS 60 👍	<<locked>>	89%	44048	89%	**35	100%
ReloadSwiss RS 62	<<locked>>	92%	43453	88%	**72	97%
ReloadSwiss RS 70	<<locked>>	92%	44005	89%	**95	96%
Rottweil R 903 👍	<<locked>>	86%	43642	89%	**10	99%
[Rottweil R 907]*	<<locked>>	88%	44222	90%	**74	93%
SNPE Vectan SP 11	<<locked>>	85%	43613	88%	**40	98%
SNPE Vectan Tubal 5000	<<locked>>	84%	43729	89%	**95	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	89%	43729	89%	**22	94%
Shooters World Long Rifle	<<locked>>	89%	43497	88%	**64	96%
Somchem S355	<<locked>>	86%	44222	90%	**10	99%
Somchem S365 👍	<<locked>>	96%	44121	89%	**02	100%
[Somchem S385]*	<<locked>>	97%	42438	86%	**94	93%
Vihtavuori N135	<<locked>>	87%	44353	90%	**64	100%
Vihtavuori N150	<<locked>>	91%	43816	89%	**77	100%
Vihtavuori N160	<<locked>>	89%	43497	88%	**07	97%
Vihtavuori N550	<<locked>>	89%	43903	89%	**56	97%
Vihtavuori N555	<<locked>>	97%	38957	79%	**97	97%
Winchester 6.5 StaBALL	<<locked>>	90%	43555	88%	**84	99%
[Winchester 760]*	<<locked>>	87%	43990	89%	**49	94%
Winchester StaBALL HD	<<locked>>	97%	32242	65%	**82	95%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2208	<<locked>>	81%	39581	80%	**85	97%
[Accurate 2700]*	<<locked>>	81%	38203	77%	**90	91%
[Accurate 3100]*	<<locked>>	92%	31314	64%	**31	90%
Accurate 4064	<<locked>>	81%	40683	83%	**31	100%
[Accurate 4350]*	<<locked>>	81%	29965	61%	**18	92%
Alliant Reloder- TS 15.5	<<locked>>	81%	39523	80%	**18	98%
[Alliant Reloder-16]*	<<locked>>	81%	30530	62%	**21	91%
Alliant Reloder-17	<<locked>>	81%	34011	69%	**59	96%
[Alliant Reloder-19]*	<<locked>>	94%	40509	82%	**58	90%
[Alliant Reloder-23]*	<<locked>>	86%	25831	52%	**90	90%
[Alliant Reloder-26]*	<<locked>>	90%	31314	64%	**17	90%
Hodgdon CFE223	<<locked>>	81%	40814	83%	**87	96%
Hodgdon H380	<<locked>>	81%	39813	81%	**15	95%
[Hodgdon H414]*	<<locked>>	81%	35012	71%	**40	90%
[Hodgdon H4350]*	<<locked>>	88%	36999	75%	**23	90%
[Hodgdon Hybrid 100V]*	<<locked>>	81%	27891	57%	**20	93%
[Hodgdon LVR]*	<<locked>>	81%	33141	67%	**87	92%
[Hodgdon Superperformance]*	<<locked>>	86%	37652	76%	**08	90%
Hodgdon VARGET	<<locked>>	81%	39218	80%	**76	96%
Hodgdon TrailBoss	<<locked>>	81%	26789	54%	**36	100%
IMR 4064	<<locked>>	81%	39044	79%	**62	97%
[IMR 4166 Enduron]*	<<locked>>	81%	38856	79%	**26	92%
[IMR 4350]*	<<locked>>	86%	36593	74%	**20	90%
[IMR 4451 Enduron]*	<<locked>>	81%	36912	75%	**03	91%
[IMR 4831]*	<<locked>>	82%	27688	56%	**23	90%
[Lovex S065]*	<<locked>>	81%	34113	69%	**48	92%
[Lovex S070]*	<<locked>>	82%	33794	69%	**54	90%
[Norma 204]*	<<locked>>	90%	40698	83%	**41	90%
[Norma MRP]*	<<locked>>	94%	36912	75%	**44	90%
[Norma URP]*	<<locked>>	81%	30501	62%	**21	92%
[Ramshot Hunter]*	<<locked>>	83%	32445	66%	**67	90%
ReloadSwiss RS 14	<<locked>>	81%	27282	55%	**78	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	40495	82%	**02	94%
ReloadSwiss RS 52	<<locked>>	81%	40495	82%	**81	99%
ReloadSwiss RS 60	<<locked>>	81%	33199	67%	**53	96%
[ReloadSwiss RS 62]*	<<locked>>	81%	29747	60%	**21	91%
[ReloadSwiss RS 70]*	<<locked>>	83%	31923	65%	**67	90%
Rottweil R 903	<<locked>>	81%	36651	74%	**49	97%
[Rottweil R 907]*	<<locked>>	82%	36056	73%	**77	90%
SNPE Vectan SP 11	<<locked>>	81%	37753	77%	**08	97%
SNPE Vectan Tubal 5000	<<locked>>	81%	39305	80%	**07	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	82%	33910	69%	**02	90%
[Shooters World Long Rifle]*	<<locked>>	81%	34113	69%	**48	92%
Somchem S355	<<locked>>	81%	37478	76%	**56	97%
[Somchem S365]*	<<locked>>	81%	27108	55%	**56	94%
[Somchem S385]*	<<locked>>	92%	36622	74%	**49	90%
Vihtavuori N135	<<locked>>	81%	36521	74%	**03	100%
Vihtavuori N150	<<locked>>	81%	31865	65%	**92	97%
[Vihtavuori N160]*	<<locked>>	81%	33098	67%	**64	93%
[Vihtavuori N550]*	<<locked>>	81%	33373	68%	**94	93%
[Vihtavuori N555]*	<<locked>>	85%	26455	54%	**43	90%
Winchester 6.5 StaBALL	<<locked>>	81%	31691	64%	**02	95%
[Winchester 760]*	<<locked>>	81%	35012	71%	**40	90%
[Winchester StaBALL HD]*	<<locked>>	91%	27050	55%	**82	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.