Load data for .257 Roberts + .257 | 100gr | Nosler Partition SP

Recommended Powder(s): Alliant Reloder-17, IMR 4895, ReloadSwiss RS 52, ReloadSwiss RS 60, Somchem S365

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 100gr \| Nosler Partition SP
Manufacturer SKU:	16317
Bullet Weight:	100gr \| 6.5g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.035" \| 26.3mm
Caliber:	.257 Roberts load data
Case Length (l3):	2.233" \| 56.7mm
Cartridge Length (C.O.L.):	2.733" \| 69.4mm
Seated Depth:	0.535" \| 13.6mm
Shank Seated Depth:	0.535" \| 13.6mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	51488 psi \| 3550 bar
LID:	LID_B4002_C241
Last updated:	2025-01-01

Load data for 122 loads in caliber .257 Roberts with .257 | 100gr | Nosler Partition SP bullet and 61 powders such as Alliant Reloder-17, IMR 4895, ReloadSwiss RS 52, ReloadSwiss RS 60, 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 "Dashboard " page to set the measure system (imperial vs. metric)
Muzzle velocity vs. barrel length
Every 1 inch additional barrel length increases muzzle velocity by approx. 33.2 fps
C.O.L. (Inch)
C.O.L. (mm)
We recommend you limit powder range to relevant brands to speed up re-calculation of results
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.
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 2208	<<locked>>	87%	45832	89%	**81	98%
[Accurate 2700]*	<<locked>>	88%	45672	89%	**12	93%
Accurate 4064	<<locked>>	87%	45992	89%	**04	100%
Accurate 4350	<<locked>>	95%	45919	89%	**66	97%
Alliant Reloder- TS 15.5	<<locked>>	88%	46267	90%	**27	99%
Alliant Reloder-15	<<locked>>	85%	45513	88%	**13	98%
Alliant Reloder-16	<<locked>>	96%	45847	89%	**89	98%
Alliant Reloder-17 👍	<<locked>>	92%	45861	89%	**15	99%
Alliant Reloder-23	<<locked>>	96%	33373	65%	**07	95%
[Alliant Reloder-26]*	<<locked>>	97%	37231	72%	**61	94%
Hodgdon CFE223	<<locked>>	86%	45382	88%	**43	97%
Hodgdon H380	<<locked>>	87%	46064	89%	**07	97%
[Hodgdon H414]*	<<locked>>	91%	46282	90%	**63	94%
[Hodgdon H4350]*	<<locked>>	96%	45440	88%	**81	93%
Hodgdon Hybrid 100V	<<locked>>	96%	43120	84%	**84	98%
Hodgdon LVR	<<locked>>	93%	45788	89%	**46	97%
[Hodgdon Superperformance]*	<<locked>>	93%	46296	90%	**79	94%
Hodgdon VARGET	<<locked>>	87%	45397	88%	**71	98%
Hodgdon TrailBoss	<<locked>>	95%	33069	64%	**44	100%
IMR 3031	<<locked>>	85%	45585	89%	**13	100%
IMR 4064	<<locked>>	88%	46195	90%	**81	98%
[IMR 4166 Enduron]*	<<locked>>	88%	45977	89%	**41	94%
[IMR 4350]*	<<locked>>	95%	45571	89%	**87	93%
[IMR 4451 Enduron]*	<<locked>>	90%	46166	90%	**77	94%
IMR 4831	<<locked>>	97%	41031	80%	**51	96%
IMR 4895 👍	<<locked>>	84%	45774	89%	**36	99%
Lovex S062	<<locked>>	86%	46195	90%	**87	99%
Lovex S065	<<locked>>	92%	45745	89%	**81	96%
[Lovex S070]*	<<locked>>	94%	45382	88%	**87	94%
Norma 203B	<<locked>>	86%	45788	89%	**23	98%
[Norma 204]*	<<locked>>	95%	46064	89%	**23	92%
Norma URP	<<locked>>	95%	45295	88%	**46	97%
Ramshot Big Game	<<locked>>	86%	45716	89%	**40	98%
Ramshot Hunter	<<locked>>	96%	46311	90%	**79	96%
ReloadSwiss RS 14	<<locked>>	96%	34026	66%	**00	100%
ReloadSwiss RS 50	<<locked>>	86%	45600	89%	**74	95%
ReloadSwiss RS 52 👍	<<locked>>	86%	45730	89%	**53	100%
ReloadSwiss RS 60 👍	<<locked>>	92%	45556	88%	**22	100%
ReloadSwiss RS 62	<<locked>>	95%	45542	88%	**79	97%
ReloadSwiss RS 70	<<locked>>	95%	45905	89%	**02	96%
Rottweil R 902	<<locked>>	84%	45368	88%	**54	99%
Rottweil R 903	<<locked>>	89%	45542	88%	**13	99%
[Rottweil R 907]*	<<locked>>	91%	45788	89%	**61	93%
SNPE Vectan SP 11	<<locked>>	88%	45527	88%	**36	98%
SNPE Vectan Tubal 5000	<<locked>>	87%	45614	89%	**95	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	92%	45426	88%	**22	94%
Shooters World Long Rifle	<<locked>>	92%	45745	89%	**81	96%
Shooters World Precision	<<locked>>	86%	46195	90%	**87	99%
Somchem S355	<<locked>>	89%	45368	88%	**00	99%
Somchem S365 👍	<<locked>>	97%	42902	83%	**53	99%
Vihtavuori N133	<<locked>>	84%	46253	90%	**02	100%
Vihtavuori N135	<<locked>>	90%	45571	89%	**54	100%
Vihtavuori N140	<<locked>>	84%	45469	88%	**48	100%
Vihtavuori N150	<<locked>>	94%	45643	89%	**71	100%
Vihtavuori N160	<<locked>>	92%	45818	89%	**17	97%
Vihtavuori N540	<<locked>>	85%	46311	90%	**87	100%
Vihtavuori N550	<<locked>>	92%	45876	89%	**53	97%
Vihtavuori N555	<<locked>>	97%	36289	70%	**08	95%
Winchester 6.5 StaBALL	<<locked>>	94%	45977	89%	**94	99%
[Winchester 760]*	<<locked>>	91%	46282	90%	**63	94%
[Winchester StaBALL HD]*	<<locked>>	97%	30182	59%	**61	93%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2208	<<locked>>	81%	37637	73%	**03	96%
[Accurate 2700]*	<<locked>>	83%	38479	75%	**57	90%
Accurate 4064	<<locked>>	81%	38406	75%	**53	100%
[Accurate 4350]*	<<locked>>	82%	28311	55%	**36	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	36970	72%	**26	97%
Alliant Reloder-15	<<locked>>	81%	39958	78%	**95	97%
[Alliant Reloder-16]*	<<locked>>	82%	29646	58%	**59	90%
[Alliant Reloder-17]*	<<locked>>	81%	32242	63%	**74	94%
[Alliant Reloder-23]*	<<locked>>	89%	26411	51%	**80	90%
[Alliant Reloder-26]*	<<locked>>	92%	31836	62%	**00	90%
Hodgdon CFE223	<<locked>>	81%	38232	74%	**92	95%
[Hodgdon H380]*	<<locked>>	81%	37550	73%	**26	94%
[Hodgdon H414]*	<<locked>>	83%	35505	69%	**20	90%
[Hodgdon H4350]*	<<locked>>	91%	38101	74%	**17	90%
[Hodgdon Hybrid 100V]*	<<locked>>	81%	26324	51%	**38	91%
[Hodgdon LVR]*	<<locked>>	81%	31270	61%	**92	91%
[Hodgdon Superperformance]*	<<locked>>	88%	39015	76%	**05	90%
Hodgdon VARGET	<<locked>>	81%	37260	72%	**90	95%
Hodgdon TrailBoss	<<locked>>	81%	26731	52%	**99	100%
IMR 3031	<<locked>>	81%	40712	79%	**18	100%
IMR 4064	<<locked>>	81%	36825	72%	**80	96%
[IMR 4166 Enduron]*	<<locked>>	81%	36956	72%	**38	91%
[IMR 4350]*	<<locked>>	89%	37623	73%	**07	90%
[IMR 4451 Enduron]*	<<locked>>	82%	35694	69%	**38	90%
[IMR 4831]*	<<locked>>	85%	27804	54%	**03	90%
IMR 4895	<<locked>>	81%	40843	79%	**31	97%
Lovex S062	<<locked>>	81%	39624	77%	**53	98%
[Lovex S065]*	<<locked>>	81%	32401	63%	**66	91%
[Lovex S070]*	<<locked>>	85%	34243	67%	**31	90%
Norma 203B	<<locked>>	81%	39334	76%	**82	97%
[Norma 204]*	<<locked>>	92%	42105	82%	**38	90%
[Norma URP]*	<<locked>>	81%	28848	56%	**39	90%
Ramshot Big Game	<<locked>>	81%	39044	76%	**92	97%
[Ramshot Hunter]*	<<locked>>	86%	33460	65%	**61	90%
ReloadSwiss RS 14	<<locked>>	81%	26803	52%	**32	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	38319	74%	**13	92%
ReloadSwiss RS 52	<<locked>>	81%	38101	74%	**99	98%
ReloadSwiss RS 60	<<locked>>	81%	31401	61%	**61	95%
[ReloadSwiss RS 62]*	<<locked>>	83%	29617	58%	**82	90%
[ReloadSwiss RS 70]*	<<locked>>	86%	33214	65%	**74	91%
Rottweil R 902	<<locked>>	81%	41626	81%	**76	99%
Rottweil R 903	<<locked>>	81%	34708	67%	**71	96%
[Rottweil R 907]*	<<locked>>	85%	37637	73%	**80	90%
SNPE Vectan SP 11	<<locked>>	81%	35563	69%	**20	96%
SNPE Vectan Tubal 5000	<<locked>>	81%	37072	72%	**31	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	84%	34403	67%	**82	90%
[Shooters World Long Rifle]*	<<locked>>	81%	32401	63%	**66	91%
Shooters World Precision	<<locked>>	81%	39624	77%	**53	98%
Somchem S355	<<locked>>	81%	35505	69%	**77	96%
[Somchem S365]*	<<locked>>	81%	25643	50%	**70	92%
Vihtavuori N133	<<locked>>	81%	42163	82%	**26	100%
Vihtavuori N135	<<locked>>	81%	34374	67%	**31	100%
Vihtavuori N140	<<locked>>	81%	40596	79%	**59	100%
Vihtavuori N150	<<locked>>	81%	30269	59%	**23	96%
[Vihtavuori N160]*	<<locked>>	81%	31169	61%	**72	92%
Vihtavuori N540	<<locked>>	81%	40640	79%	**79	100%
[Vihtavuori N550]*	<<locked>>	81%	31299	61%	**12	92%
[Vihtavuori N555]*	<<locked>>	88%	27050	53%	**30	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	30008	58%	**13	94%
[Winchester 760]*	<<locked>>	83%	35505	69%	**20	90%
[Winchester StaBALL HD]*	<<locked>>	94%	27688	54%	**69	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