Load data for .256 Mag. Gibbs + .257 | 115gr | CutEdge MTH

Recommended Powder(s): Accurate 4350, Alliant Reloder-16, Hodgdon Hybrid 100V, Norma URP, Somchem S365

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 115gr \| CutEdge MTH
Manufacturer SKU:	MTH K02
Bullet Weight:	115gr \| 7.5g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.290" \| 32.8mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.459" \| 11.7mm
Shank Seated Depth:	0.266" \| 6.8mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B8422_C231
Last updated:	2025-01-01
Recommended Twist Rate:	1:8 - 1:7

Load data for 110 loads in caliber .256 Mag. Gibbs with .257 | 115gr | CutEdge MTH bullet and 55 powders such as Accurate 4350, Alliant Reloder-16, Hodgdon Hybrid 100V, Norma URP, 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 2209]*	<<locked>>	94%	43656	89%	**76	94%
Accurate 2700	<<locked>>	83%	43787	89%	**57	95%
Accurate 3100	<<locked>>	96%	39769	81%	**84	96%
Accurate 4350 👍	<<locked>>	90%	44280	90%	**99	99%
Alliant Reloder-16 👍	<<locked>>	90%	43947	89%	**18	99%
Alliant Reloder-17	<<locked>>	86%	44019	89%	**41	100%
[Alliant Reloder-19]*	<<locked>>	95%	43511	88%	**76	94%
[Alliant Reloder-22]*	<<locked>>	96%	40277	82%	**46	93%
Alliant Reloder-23	<<locked>>	97%	38667	78%	**33	99%
[Alliant Reloder-25]*	<<locked>>	97%	33794	69%	**08	94%
Alliant Reloder-26	<<locked>>	97%	42859	87%	**90	98%
Hodgdon H414	<<locked>>	85%	44121	89%	**89	96%
Hodgdon H4350	<<locked>>	92%	44324	90%	**36	95%
Hodgdon Hybrid 100V 👍	<<locked>>	92%	43381	88%	**53	100%
Hodgdon LVR	<<locked>>	87%	44034	89%	**85	98%
Hodgdon Superperformance	<<locked>>	88%	43453	88%	**05	95%
Hodgdon TrailBoss	<<locked>>	97%	34229	69%	**72	100%
IMR 4064	<<locked>>	83%	43932	89%	**10	99%
IMR 4166 Enduron	<<locked>>	84%	44251	90%	**87	96%
IMR 4350	<<locked>>	90%	43584	88%	**20	95%
IMR 4451 Enduron	<<locked>>	85%	44092	89%	**10	96%
IMR 4831	<<locked>>	94%	43656	89%	**66	99%
[IMR 4955 Enduron]*	<<locked>>	96%	43714	89%	**17	92%
Lovex S065	<<locked>>	87%	43787	89%	**10	97%
Lovex S070	<<locked>>	89%	44063	89%	**36	96%
[Lovex S071]*	<<locked>>	97%	33098	67%	**33	93%
[Norma 204]*	<<locked>>	90%	43627	88%	**56	94%
Norma MRP	<<locked>>	96%	42438	86%	**38	95%
Norma URP 👍	<<locked>>	90%	44193	90%	**95	99%
Ramshot Hunter	<<locked>>	90%	43482	88%	**89	97%
[Ramshot Magnum]*	<<locked>>	97%	39392	80%	**00	93%
ReloadSwiss RS 14	<<locked>>	96%	34243	69%	**08	100%
ReloadSwiss RS 60	<<locked>>	87%	43584	88%	**58	100%
ReloadSwiss RS 62	<<locked>>	90%	43439	88%	**05	98%
ReloadSwiss RS 70	<<locked>>	90%	43656	89%	**31	98%
Rottweil R 903	<<locked>>	84%	43540	88%	**30	100%
[Rottweil R 904]*	<<locked>>	93%	43627	88%	**20	92%
[Rottweil R 905]*	<<locked>>	96%	44092	89%	**99	94%
Rottweil R 907	<<locked>>	86%	44092	89%	**10	95%
SNPE Vectan SP 11	<<locked>>	83%	44005	89%	**69	99%
SNPE Vectan Tubal 5000	<<locked>>	83%	44092	89%	**31	100%
SNPE Vectan Tubal 7000	<<locked>>	88%	44106	89%	**74	96%
Shooters World Long Rifle	<<locked>>	87%	43787	89%	**10	97%
Somchem S355	<<locked>>	84%	43613	88%	**23	99%
Somchem S365 👍	<<locked>>	93%	43526	88%	**25	100%
Somchem S385	<<locked>>	95%	43714	89%	**53	95%
Vihtavuori N135	<<locked>>	85%	43700	89%	**64	100%
Vihtavuori N150	<<locked>>	89%	44309	90%	**10	100%
Vihtavuori N160	<<locked>>	87%	44005	89%	**46	98%
[Vihtavuori N165]*	<<locked>>	97%	38101	77%	**21	92%
Vihtavuori N550	<<locked>>	87%	43830	89%	**82	98%
Vihtavuori N555	<<locked>>	97%	42453	86%	**05	99%
Winchester 6.5 StaBALL	<<locked>>	89%	43990	89%	**36	100%
Winchester 760	<<locked>>	85%	44121	89%	**89	96%
Winchester StaBALL HD	<<locked>>	97%	33997	69%	**10	99%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AR 2209]*	<<locked>>	88%	36071	73%	**92	90%
[Accurate 2700]*	<<locked>>	81%	40248	82%	**85	94%
[Accurate 3100]*	<<locked>>	86%	27528	56%	**82	90%
Accurate 4350	<<locked>>	81%	32024	65%	**20	95%
Alliant Reloder-16	<<locked>>	81%	32590	66%	**52	95%
Alliant Reloder-17	<<locked>>	81%	36245	73%	**71	98%
[Alliant Reloder-19]*	<<locked>>	88%	35418	72%	**92	90%
[Alliant Reloder-22]*	<<locked>>	93%	35433	72%	**31	90%
[Alliant Reloder-23]*	<<locked>>	81%	23337	47%	**70	91%
[Alliant Reloder-25]*	<<locked>>	92%	29167	59%	**64	90%
[Alliant Reloder-26]*	<<locked>>	84%	27108	55%	**51	90%
[Hodgdon H414]*	<<locked>>	81%	37811	77%	**61	94%
[Hodgdon H4350]*	<<locked>>	82%	32271	65%	**61	90%
Hodgdon Hybrid 100V	<<locked>>	81%	29733	60%	**41	96%
Hodgdon LVR	<<locked>>	81%	35346	72%	**92	95%
[Hodgdon Superperformance]*	<<locked>>	81%	33692	68%	**66	91%
Hodgdon TrailBoss	<<locked>>	83%	28050	57%	**44	100%
IMR 4064	<<locked>>	81%	41060	83%	**48	99%
IMR 4166 Enduron	<<locked>>	81%	40625	82%	**15	95%
[IMR 4350]*	<<locked>>	81%	33257	67%	**87	91%
[IMR 4451 Enduron]*	<<locked>>	81%	38856	79%	**02	94%
[IMR 4831]*	<<locked>>	81%	28036	57%	**95	93%
[IMR 4955 Enduron]*	<<locked>>	94%	40248	82%	**41	90%
Lovex S065	<<locked>>	81%	36289	74%	**46	95%
[Lovex S070]*	<<locked>>	81%	34127	69%	**10	93%
[Lovex S071]*	<<locked>>	91%	27528	56%	**82	90%
[Norma 204]*	<<locked>>	84%	35955	73%	**85	90%
[Norma MRP]*	<<locked>>	88%	32126	65%	**75	90%
Norma URP	<<locked>>	81%	32460	66%	**23	95%
[Ramshot Hunter]*	<<locked>>	81%	31662	64%	**10	92%
[Ramshot Magnum]*	<<locked>>	93%	34418	70%	**82	90%
ReloadSwiss RS 14	<<locked>>	81%	27325	55%	**57	100%
ReloadSwiss RS 60	<<locked>>	81%	35172	71%	**64	99%
[ReloadSwiss RS 62]*	<<locked>>	81%	31966	65%	**43	94%
[ReloadSwiss RS 70]*	<<locked>>	81%	31763	64%	**33	93%
Rottweil R 903	<<locked>>	81%	38957	79%	**44	99%
[Rottweil R 904]*	<<locked>>	89%	38276	78%	**08	90%
[Rottweil R 905]*	<<locked>>	89%	34679	70%	**75	90%
[Rottweil R 907]*	<<locked>>	81%	37115	75%	**56	93%
SNPE Vectan SP 11	<<locked>>	81%	40277	82%	**00	99%
SNPE Vectan Tubal 5000	<<locked>>	81%	41263	84%	**85	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	81%	35476	72%	**90	93%
Shooters World Long Rifle	<<locked>>	81%	36289	74%	**46	95%
Somchem S355	<<locked>>	81%	40016	81%	**54	99%
Somchem S365	<<locked>>	81%	29109	59%	**77	97%
[Somchem S385]*	<<locked>>	86%	31531	64%	**77	90%
Vihtavuori N135	<<locked>>	81%	39015	79%	**79	100%
Vihtavuori N150	<<locked>>	81%	34011	69%	**93	99%
Vihtavuori N160	<<locked>>	81%	35389	72%	**69	96%
[Vihtavuori N165]*	<<locked>>	93%	33518	68%	**10	90%
Vihtavuori N550	<<locked>>	81%	36027	73%	**15	96%
[Vihtavuori N555]*	<<locked>>	81%	24729	50%	**46	91%
Winchester 6.5 StaBALL	<<locked>>	81%	33649	68%	**16	98%
[Winchester 760]*	<<locked>>	81%	37811	77%	**61	94%
[Winchester StaBALL HD]*	<<locked>>	86%	23786	48%	**43	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.

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