Load data for .256 Mag. Gibbs + .257 | 120gr | Remington PSP Core-Lokt

Recommended Powder(s): Alliant Reloder-16, Alliant Reloder-26, IMR 4831, Somchem S365, Vihtavuori N555

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 120gr \| Remington PSP Core-Lokt
Bullet Weight:	120gr \| 7.8g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.140" \| 29.0mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.309" \| 7.8mm
Shank Seated Depth:	0.309" \| 7.8mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B5144_C231
Last updated:	2025-01-01

Load data for 104 loads in caliber .256 Mag. Gibbs with .257 | 120gr | Remington PSP Core-Lokt bullet and 52 powders such as Alliant Reloder-16, Alliant Reloder-26, IMR 4831, Somchem S365, Vihtavuori N555. 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 (%)
Min FR (%)
Max FR*
Barrel Length (Inch)
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 2209]*	<<locked>>	93%	44367	90%	**33	94%
[ADI AR 2213]*	<<locked>>	96%	43511	88%	**33	92%
Accurate 3100	<<locked>>	97%	43961	89%	**10	98%
Accurate 4350	<<locked>>	87%	43598	88%	**20	99%
Alliant Reloder-16 👍	<<locked>>	88%	43714	89%	**59	99%
Alliant Reloder-17	<<locked>>	84%	43424	88%	**72	100%
Alliant Reloder-19	<<locked>>	93%	44309	90%	**36	95%
Alliant Reloder-22	<<locked>>	97%	43816	89%	**72	95%
Alliant Reloder-23	<<locked>>	97%	41452	84%	**30	100%
Alliant Reloder-25	<<locked>>	97%	36027	73%	**15	95%
Alliant Reloder-26 👍	<<locked>>	95%	43961	89%	**44	99%
Hodgdon H414	<<locked>>	83%	43961	89%	**33	97%
Hodgdon H4350	<<locked>>	90%	43976	89%	**71	96%
[Hodgdon H4831 SC]*	<<locked>>	94%	43685	89%	**94	92%
Hodgdon Hybrid 100V	<<locked>>	91%	44179	90%	**10	100%
Hodgdon LVR	<<locked>>	85%	43772	89%	**17	98%
Hodgdon Superperformance	<<locked>>	86%	43918	89%	**59	96%
Hodgdon TrailBoss	<<locked>>	97%	34519	70%	**39	100%
IMR 4350	<<locked>>	87%	43468	88%	**57	96%
IMR 4831 👍	<<locked>>	93%	44280	90%	**20	99%
[IMR 4955 Enduron]*	<<locked>>	94%	43888	89%	**64	92%
[IMR 7828 SSC]*	<<locked>>	95%	43976	89%	**59	92%
Lovex S065	<<locked>>	85%	43671	89%	**51	98%
Lovex S070	<<locked>>	87%	44367	90%	**80	97%
Lovex S071	<<locked>>	97%	36535	74%	**49	95%
[Norma 204]*	<<locked>>	88%	43816	89%	**00	94%
Norma MRP	<<locked>>	95%	43540	88%	**95	96%
Norma URP	<<locked>>	88%	43656	89%	**17	99%
Ramshot Hunter	<<locked>>	89%	43801	89%	**36	97%
[Ramshot Magnum]*	<<locked>>	96%	41626	84%	**97	94%
ReloadSwiss RS 14	<<locked>>	96%	34664	70%	**72	100%
ReloadSwiss RS 60	<<locked>>	85%	43961	89%	**02	100%
ReloadSwiss RS 62	<<locked>>	88%	43656	89%	**43	99%
ReloadSwiss RS 70	<<locked>>	88%	43947	89%	**79	98%
[Rottweil R 904]*	<<locked>>	92%	44208	90%	**77	93%
Rottweil R 905	<<locked>>	94%	44106	89%	**40	95%
Rottweil R 907	<<locked>>	84%	44121	89%	**48	96%
SNPE Vectan Tubal 7000	<<locked>>	86%	43961	89%	**15	97%
Shooters World Long Rifle	<<locked>>	85%	43671	89%	**51	98%
[Somchem S361]*	<<locked>>	91%	44237	90%	**51	92%
Somchem S365 👍	<<locked>>	91%	43598	88%	**56	100%
Somchem S385	<<locked>>	93%	43888	89%	**07	96%
Vihtavuori N135	<<locked>>	83%	44324	90%	**12	100%
Vihtavuori N150	<<locked>>	87%	44063	89%	**38	100%
Vihtavuori N160	<<locked>>	86%	44324	90%	**97	99%
[Vihtavuori N165]*	<<locked>>	97%	41060	83%	**35	94%
Vihtavuori N550	<<locked>>	85%	43845	89%	**17	99%
Vihtavuori N555 👍	<<locked>>	95%	43918	89%	**72	99%
[Vihtavuori N560]*	<<locked>>	97%	44295	90%	**85	92%
Winchester 6.5 StaBALL	<<locked>>	87%	44106	89%	**80	100%
Winchester 760	<<locked>>	83%	43961	89%	**33	97%
Winchester StaBALL HD	<<locked>>	97%	33765	68%	**46	100%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AR 2209]*	<<locked>>	85%	34447	70%	**03	90%
[ADI AR 2213]*	<<locked>>	92%	39102	79%	**35	90%
[Accurate 3100]*	<<locked>>	82%	26440	54%	**93	90%
Accurate 4350	<<locked>>	81%	34751	70%	**36	97%
Alliant Reloder-16	<<locked>>	81%	34693	70%	**46	97%
Alliant Reloder-17	<<locked>>	81%	39088	79%	**80	99%
[Alliant Reloder-19]*	<<locked>>	85%	33910	69%	**97	90%
[Alliant Reloder-22]*	<<locked>>	89%	33518	68%	**30	90%
[Alliant Reloder-23]*	<<locked>>	81%	25135	51%	**87	93%
[Alliant Reloder-25]*	<<locked>>	89%	28326	57%	**85	90%
[Alliant Reloder-26]*	<<locked>>	81%	26643	54%	**79	91%
Hodgdon H414	<<locked>>	81%	40408	82%	**54	95%
[Hodgdon H4350]*	<<locked>>	81%	33634	68%	**41	92%
[Hodgdon H4831 SC]*	<<locked>>	92%	40263	82%	**15	90%
Hodgdon Hybrid 100V	<<locked>>	81%	31908	65%	**38	97%
Hodgdon LVR	<<locked>>	81%	37739	77%	**92	97%
[Hodgdon Superperformance]*	<<locked>>	81%	36318	74%	**89	93%
Hodgdon TrailBoss	<<locked>>	87%	30081	61%	**50	100%
[IMR 4350]*	<<locked>>	81%	35273	72%	**84	93%
IMR 4831	<<locked>>	81%	30806	62%	**15	95%
[IMR 4955 Enduron]*	<<locked>>	90%	38783	79%	**52	90%
[IMR 7828 SSC]*	<<locked>>	92%	38870	79%	**41	90%
Lovex S065	<<locked>>	81%	38653	78%	**43	96%
[Lovex S070]*	<<locked>>	81%	36854	75%	**23	94%
[Lovex S071]*	<<locked>>	87%	26832	54%	**00	90%
[Norma 204]*	<<locked>>	81%	34766	71%	**97	90%
[Norma MRP]*	<<locked>>	85%	31241	63%	**90	90%
Norma URP	<<locked>>	81%	35157	71%	**39	97%
[Ramshot Hunter]*	<<locked>>	81%	34142	69%	**20	94%
[Ramshot Magnum]*	<<locked>>	91%	33620	68%	**10	90%
ReloadSwiss RS 14	<<locked>>	83%	28601	58%	**44	100%
ReloadSwiss RS 60	<<locked>>	81%	37898	77%	**67	100%
ReloadSwiss RS 62	<<locked>>	81%	34534	70%	**46	96%
ReloadSwiss RS 70	<<locked>>	81%	34214	69%	**49	95%
[Rottweil R 904]*	<<locked>>	86%	37347	76%	**33	90%
[Rottweil R 905]*	<<locked>>	85%	32779	66%	**80	90%
[Rottweil R 907]*	<<locked>>	81%	39755	81%	**59	94%
SNPE Vectan Tubal 7000	<<locked>>	81%	37811	77%	**90	95%
Shooters World Long Rifle	<<locked>>	81%	38653	78%	**43	96%
[Somchem S361]*	<<locked>>	87%	39059	79%	**46	90%
Somchem S365	<<locked>>	81%	31459	64%	**84	99%
[Somchem S385]*	<<locked>>	82%	30647	62%	**95	90%
Vihtavuori N135	<<locked>>	81%	41481	84%	**59	100%
Vihtavuori N150	<<locked>>	81%	36318	74%	**87	99%
Vihtavuori N160	<<locked>>	81%	38247	78%	**69	97%
[Vihtavuori N165]*	<<locked>>	89%	31908	65%	**18	90%
Vihtavuori N550	<<locked>>	81%	38595	78%	**08	97%
[Vihtavuori N555]*	<<locked>>	81%	27093	55%	**62	94%
[Vihtavuori N560]*	<<locked>>	94%	39856	81%	**87	90%
Winchester 6.5 StaBALL	<<locked>>	81%	36158	73%	**13	99%
Winchester 760	<<locked>>	81%	40408	82%	**54	95%
[Winchester StaBALL HD]*	<<locked>>	82%	22785	46%	**51	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.