Load data for .256 Mag. Gibbs + .257 | 90gr | CutEdge ER Raptor

Recommended Powder(s): ReloadSwiss RS 52, ReloadSwiss RS 60

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 90gr \| CutEdge ER Raptor
Manufacturer SKU:	ER I90 CU RAPTOR
Bullet Weight:	90gr \| 5.8g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.243" \| 31.6mm
Caliber:	.256 Mag. Gibbs load data
Case Length (l3):	2.173" \| 55.2mm
Cartridge Length (C.O.L.):	3.004" \| 76.3mm
Seated Depth:	0.412" \| 10.5mm
Shank Seated Depth:	0.219" \| 5.6mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	49313 psi \| 3400 bar
LID:	LID_B8420_C231
Last updated:	2025-01-01
Recommended Twist Rate:	1:8 - 1:7

Load data for 116 loads in caliber .256 Mag. Gibbs with .257 | 90gr | CutEdge ER Raptor bullet and 58 powders such as ReloadSwiss RS 52, ReloadSwiss RS 60. 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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C.O.L. (mm)
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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 2208	<<locked>>	88%	44150	90%	**28	97%
Accurate 4064	<<locked>>	88%	44193	90%	**51	100%
Accurate 4350	<<locked>>	96%	44295	90%	**07	96%
Alliant Reloder- TS 15.5	<<locked>>	88%	44121	89%	**54	98%
Alliant Reloder-15	<<locked>>	85%	43540	88%	**45	97%
Alliant Reloder-16	<<locked>>	96%	43671	89%	**07	96%
Alliant Reloder-17	<<locked>>	92%	43584	88%	**36	98%
[Alliant Reloder-23]*	<<locked>>	97%	31589	64%	**05	92%
Hodgdon CFE223	<<locked>>	86%	43598	88%	**84	96%
Hodgdon H380	<<locked>>	87%	44019	89%	**45	95%
[Hodgdon H414]*	<<locked>>	91%	43569	88%	**74	92%
Hodgdon Hybrid 100V	<<locked>>	97%	41133	83%	**05	97%
Hodgdon LVR	<<locked>>	93%	43801	89%	**84	95%
Hodgdon VARGET	<<locked>>	88%	43787	89%	**12	97%
Hodgdon TrailBoss	<<locked>>	97%	33156	67%	**85	100%
IMR 3031	<<locked>>	86%	44077	89%	**74	100%
IMR 4064	<<locked>>	88%	44005	89%	**15	97%
[IMR 4166 Enduron]*	<<locked>>	88%	43816	89%	**66	92%
[IMR 4350]*	<<locked>>	95%	43801	89%	**12	92%
[IMR 4451 Enduron]*	<<locked>>	90%	43976	89%	**99	92%
[IMR 4831]*	<<locked>>	97%	38435	78%	**53	94%
IMR 4895	<<locked>>	85%	43584	88%	**64	97%
Lovex D073.6	<<locked>>	84%	44295	90%	**51	100%
Lovex S062	<<locked>>	86%	43743	89%	**15	98%
[Lovex S065]*	<<locked>>	93%	44150	90%	**12	94%
[Lovex S070]*	<<locked>>	94%	44034	89%	**25	93%
Norma 203B	<<locked>>	86%	43700	89%	**61	97%
Norma URP	<<locked>>	96%	43598	88%	**87	96%
Ramshot Big Game	<<locked>>	86%	43555	88%	**71	97%
[Ramshot Hunter]*	<<locked>>	96%	43859	89%	**84	94%
ReloadSwiss RS 14	<<locked>>	96%	33025	67%	**24	100%
[ReloadSwiss RS 50]*	<<locked>>	87%	44063	89%	**05	93%
ReloadSwiss RS 52 👍	<<locked>>	87%	44048	89%	**04	99%
ReloadSwiss RS 60 👍	<<locked>>	93%	44266	90%	**73	99%
ReloadSwiss RS 62	<<locked>>	96%	43961	89%	**23	96%
[ReloadSwiss RS 70]*	<<locked>>	95%	43758	89%	**14	94%
Rottweil R 902	<<locked>>	85%	44106	89%	**09	98%
Rottweil R 903	<<locked>>	91%	44324	90%	**64	98%
[Rottweil R 907]*	<<locked>>	91%	43816	89%	**95	92%
SNPE Vectan SP 11	<<locked>>	89%	43642	88%	**74	97%
SNPE Vectan SP 9	<<locked>>	83%	43903	89%	**28	97%
SNPE Vectan Tubal 5000	<<locked>>	88%	43584	88%	**43	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	93%	43613	88%	**53	93%
[Shooters World Long Rifle]*	<<locked>>	93%	44150	90%	**12	94%
Shooters World Match Rifle	<<locked>>	84%	44295	90%	**51	100%
Shooters World Precision	<<locked>>	86%	43743	89%	**15	98%
Somchem S355	<<locked>>	90%	43903	89%	**48	98%
Somchem S365	<<locked>>	96%	39798	81%	**51	98%
Vihtavuori N133	<<locked>>	84%	43830	89%	**43	100%
Vihtavuori N135	<<locked>>	91%	43729	89%	**99	100%
Vihtavuori N140	<<locked>>	85%	43598	88%	**89	100%
Vihtavuori N150	<<locked>>	95%	43743	89%	**09	99%
Vihtavuori N160	<<locked>>	93%	43540	88%	**48	96%
Vihtavuori N540	<<locked>>	85%	44367	90%	**35	100%
Vihtavuori N550	<<locked>>	93%	44309	90%	**97	96%
[Vihtavuori N555]*	<<locked>>	97%	33199	67%	**77	93%
Winchester 6.5 StaBALL	<<locked>>	94%	43990	89%	**22	98%
[Winchester 760]*	<<locked>>	91%	43569	88%	**74	92%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AR 2208]*	<<locked>>	81%	35723	72%	**22	94%
Accurate 4064	<<locked>>	81%	35447	72%	**61	99%
[Accurate 4350]*	<<locked>>	86%	30487	62%	**59	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	34751	70%	**38	96%
Alliant Reloder-15	<<locked>>	81%	37478	76%	**10	95%
[Alliant Reloder-16]*	<<locked>>	86%	31836	65%	**85	90%
[Alliant Reloder-17]*	<<locked>>	81%	29863	61%	**49	91%
[Alliant Reloder-23]*	<<locked>>	94%	29008	59%	**17	91%
[Hodgdon CFE223]*	<<locked>>	81%	35998	73%	**97	93%
[Hodgdon H380]*	<<locked>>	81%	35404	72%	**38	92%
[Hodgdon H414]*	<<locked>>	87%	38348	78%	**56	90%
[Hodgdon Hybrid 100V]*	<<locked>>	84%	27340	55%	**15	90%
[Hodgdon LVR]*	<<locked>>	85%	33112	67%	**12	90%
[Hodgdon VARGET]*	<<locked>>	81%	35273	72%	**12	94%
Hodgdon TrailBoss	<<locked>>	81%	26353	53%	**24	100%
IMR 3031	<<locked>>	81%	37536	76%	**40	100%
[IMR 4064]*	<<locked>>	81%	34693	70%	**89	94%
[IMR 4166 Enduron]*	<<locked>>	84%	37956	77%	**25	90%
[IMR 4350]*	<<locked>>	93%	40350	82%	**30	90%
[IMR 4451 Enduron]*	<<locked>>	86%	38928	79%	**81	90%
[IMR 4831]*	<<locked>>	90%	30168	61%	**26	90%
IMR 4895	<<locked>>	81%	38435	78%	**43	96%
Lovex D073.6	<<locked>>	81%	40596	82%	**79	99%
Lovex S062	<<locked>>	81%	36825	75%	**58	97%
[Lovex S065]*	<<locked>>	84%	33707	68%	**56	90%
[Lovex S070]*	<<locked>>	89%	37260	76%	**64	90%
Norma 203B	<<locked>>	81%	36869	75%	**97	95%
[Norma URP]*	<<locked>>	85%	30850	63%	**53	90%
Ramshot Big Game	<<locked>>	81%	36622	74%	**04	95%
[Ramshot Hunter]*	<<locked>>	91%	36376	74%	**97	90%
ReloadSwiss RS 14	<<locked>>	81%	26281	53%	**57	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	35940	73%	**15	90%
ReloadSwiss RS 52	<<locked>>	81%	35288	72%	**97	97%
[ReloadSwiss RS 60]*	<<locked>>	81%	29109	59%	**33	92%
[ReloadSwiss RS 62]*	<<locked>>	87%	31836	65%	**02	90%
[ReloadSwiss RS 70]*	<<locked>>	89%	35592	72%	**90	90%
Rottweil R 902	<<locked>>	81%	38725	79%	**87	97%
[Rottweil R 903]*	<<locked>>	81%	31778	64%	**59	94%
[Rottweil R 907]*	<<locked>>	89%	40234	82%	**13	90%
[SNPE Vectan SP 11]*	<<locked>>	81%	33127	67%	**15	93%
SNPE Vectan SP 9	<<locked>>	81%	40451	82%	**56	96%
SNPE Vectan Tubal 5000	<<locked>>	81%	34925	71%	**49	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	88%	37318	76%	**08	90%
[Shooters World Long Rifle]*	<<locked>>	84%	33707	68%	**56	90%
Shooters World Match Rifle	<<locked>>	81%	40596	82%	**79	99%
Shooters World Precision	<<locked>>	81%	36825	75%	**58	97%
[Somchem S355]*	<<locked>>	81%	33185	67%	**79	94%
[Somchem S365]*	<<locked>>	82%	24816	50%	**82	90%
Vihtavuori N133	<<locked>>	81%	40161	81%	**71	100%
Vihtavuori N135	<<locked>>	81%	31894	65%	**30	99%
Vihtavuori N140	<<locked>>	81%	38363	78%	**77	99%
[Vihtavuori N150]*	<<locked>>	81%	28079	57%	**18	94%
[Vihtavuori N160]*	<<locked>>	83%	31560	64%	**36	90%
Vihtavuori N540	<<locked>>	81%	38189	77%	**04	99%
[Vihtavuori N550]*	<<locked>>	83%	31372	64%	**69	90%
[Vihtavuori N555]*	<<locked>>	93%	29225	59%	**56	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	28166	57%	**02	91%
[Winchester 760]*	<<locked>>	87%	38348	78%	**56	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.

<<locked>>... you need to buy an access license to unlock the data