Load data for .257 Roberts + .257 | 90gr | Sierra Blitzking BT

Recommended Powder(s): Alliant Reloder- TS 15.5, Lovex S062, ReloadSwiss RS 52, ReloadSwiss RS 60, Shooters World Precision

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 90gr \| Sierra Blitzking BT
Bullet Weight:	90gr \| 5.8g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.063" \| 27.0mm
Caliber:	.257 Roberts load data
Case Length (l3):	2.233" \| 56.7mm
Cartridge Length (C.O.L.):	2.733" \| 69.4mm
Seated Depth:	0.563" \| 14.3mm
Shank Seated Depth:	0.413" \| 10.5mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	51488 psi \| 3550 bar
LID:	LID_B5790_C241
Last updated:	2025-02-02
Recommended Twist Rate:	1:10 - 1:8

Load data for 142 loads in caliber .257 Roberts with .257 | 90gr | Sierra Blitzking BT bullet and 71 powders such as Alliant Reloder- TS 15.5, Lovex S062, ReloadSwiss RS 52, ReloadSwiss RS 60, Shooters World Precision. 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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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 2206H	<<locked>>	84%	45905	89%	**35	97%
ADI AR 2208	<<locked>>	89%	45614	89%	**09	97%
Accurate 2495	<<locked>>	84%	45876	89%	**35	100%
[Accurate 2700]*	<<locked>>	91%	46311	90%	**43	92%
Accurate 4064	<<locked>>	89%	46180	90%	**51	100%
Accurate 4350	<<locked>>	97%	43526	85%	**48	96%
Alliant AR-Comp	<<locked>>	83%	45745	89%	**25	100%
Alliant Reloder- TS 15.5 👍	<<locked>>	90%	45774	89%	**48	98%
Alliant Reloder-15	<<locked>>	88%	46064	89%	**61	97%
Alliant Reloder-16	<<locked>>	96%	43207	84%	**48	95%
Alliant Reloder-17	<<locked>>	94%	46108	90%	**53	98%
Baschieri & Pellagri 107	<<locked>>	85%	45803	89%	**45	96%
Hodgdon CFE223	<<locked>>	88%	45759	89%	**87	96%
Hodgdon H380	<<locked>>	89%	45397	88%	**25	95%
[Hodgdon H414]*	<<locked>>	93%	45440	88%	**77	93%
Hodgdon Hybrid 100V	<<locked>>	96%	39494	77%	**27	96%
Hodgdon LVR	<<locked>>	95%	45934	89%	**84	95%
Hodgdon VARGET	<<locked>>	90%	46180	90%	**18	97%
Hodgdon TrailBoss	<<locked>>	95%	32474	63%	**32	100%
IMR 3031	<<locked>>	87%	45600	89%	**61	100%
IMR 4064	<<locked>>	90%	46035	89%	**15	97%
[IMR 4166 Enduron]*	<<locked>>	90%	45847	89%	**66	93%
[IMR 4350]*	<<locked>>	97%	45121	88%	**95	92%
[IMR 4451 Enduron]*	<<locked>>	92%	45861	89%	**92	93%
[IMR 4831]*	<<locked>>	97%	37275	72%	**84	93%
IMR 4895	<<locked>>	86%	45281	88%	**54	97%
IMR 8208 XBR	<<locked>>	83%	46253	90%	**18	99%
Lovex D073.6	<<locked>>	85%	45571	89%	**38	100%
Lovex S060	<<locked>>	84%	46151	90%	**69	98%
Lovex S062 👍	<<locked>>	89%	46209	90%	**31	99%
Lovex S065	<<locked>>	95%	46296	90%	**09	95%
[Lovex S070]*	<<locked>>	97%	46209	90%	**31	93%
Norma 201	<<locked>>	85%	46267	90%	**22	99%
Norma 202	<<locked>>	84%	45324	88%	**12	100%
Norma 203B	<<locked>>	89%	46311	90%	**71	98%
Norma URP	<<locked>>	97%	43729	85%	**54	96%
Ramshot Big Game	<<locked>>	88%	45368	88%	**61	97%
[Ramshot Hunter]*	<<locked>>	97%	43584	85%	**35	93%
Ramshot Wild Boar	<<locked>>	83%	46296	90%	**48	98%
ReloadSwiss RS 14	<<locked>>	95%	32880	64%	**78	100%
[ReloadSwiss RS 50]*	<<locked>>	89%	45818	89%	**05	94%
ReloadSwiss RS 52 👍	<<locked>>	89%	46050	89%	**00	99%
ReloadSwiss RS 60 👍	<<locked>>	95%	45832	89%	**59	99%
ReloadSwiss RS 62	<<locked>>	97%	43250	84%	**64	95%
[ReloadSwiss RS 70]*	<<locked>>	97%	44802	87%	**84	94%
Rottweil R 902	<<locked>>	87%	45716	89%	**02	99%
Rottweil R 903	<<locked>>	92%	45469	88%	**45	98%
[Rottweil R 907]*	<<locked>>	93%	45905	89%	**89	92%
SNPE Vectan SP 11	<<locked>>	91%	45629	89%	**81	97%
SNPE Vectan SP 7	<<locked>>	84%	45992	89%	**12	95%
SNPE Vectan SP 9	<<locked>>	85%	45426	88%	**25	97%
SNPE Vectan Tubal 3000	<<locked>>	84%	45963	89%	**40	100%
SNPE Vectan Tubal 5000	<<locked>>	90%	45600	89%	**40	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	94%	45397	88%	**36	93%
Shooters World Long Rifle	<<locked>>	95%	46296	90%	**09	95%
Shooters World Match Rifle	<<locked>>	85%	45571	89%	**38	100%
Shooters World Precision 👍	<<locked>>	89%	46209	90%	**31	99%
Somchem S335	<<locked>>	84%	45295	88%	**36	100%
Somchem S341	<<locked>>	84%	45890	89%	**12	97%
Somchem S355	<<locked>>	92%	45788	89%	**38	98%
Somchem S365	<<locked>>	97%	39189	76%	**89	98%
Vihtavuori N133	<<locked>>	86%	46238	90%	**46	100%
Vihtavuori N135	<<locked>>	93%	45992	89%	**05	100%
Vihtavuori N140	<<locked>>	87%	45992	89%	**95	100%
Vihtavuori N150	<<locked>>	97%	45542	88%	**09	99%
Vihtavuori N160	<<locked>>	95%	45905	89%	**45	96%
Vihtavuori N540	<<locked>>	87%	45440	88%	**12	100%
Vihtavuori N550	<<locked>>	95%	45905	89%	**94	96%
[Vihtavuori N555]*	<<locked>>	97%	32750	64%	**22	92%
Winchester 6.5 StaBALL	<<locked>>	96%	46296	90%	**25	98%
[Winchester 760]*	<<locked>>	93%	45440	88%	**77	93%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2206H	<<locked>>	81%	41205	80%	**40	96%
[ADI AR 2208]*	<<locked>>	81%	35099	68%	**66	93%
Accurate 2495	<<locked>>	81%	41568	81%	**56	100%
[Accurate 2700]*	<<locked>>	88%	42366	82%	**61	90%
Accurate 4064	<<locked>>	81%	35114	68%	**12	99%
[Accurate 4350]*	<<locked>>	87%	30995	60%	**36	90%
Alliant AR-Comp	<<locked>>	81%	42496	83%	**66	100%
Alliant Reloder- TS 15.5	<<locked>>	81%	34127	66%	**76	95%
[Alliant Reloder-15]*	<<locked>>	81%	36869	72%	**51	94%
[Alliant Reloder-16]*	<<locked>>	87%	32677	63%	**62	90%
[Alliant Reloder-17]*	<<locked>>	81%	29849	58%	**13	91%
Baschieri & Pellagri 107	<<locked>>	81%	40190	78%	**27	95%
[Hodgdon CFE223]*	<<locked>>	81%	35331	69%	**38	92%
[Hodgdon H380]*	<<locked>>	81%	34708	67%	**79	91%
[Hodgdon H414]*	<<locked>>	89%	39784	77%	**49	90%
[Hodgdon Hybrid 100V]*	<<locked>>	85%	27775	54%	**92	90%
[Hodgdon LVR]*	<<locked>>	86%	33736	66%	**85	90%
[Hodgdon VARGET]*	<<locked>>	81%	34751	67%	**56	93%
Hodgdon TrailBoss	<<locked>>	81%	26179	51%	**81	100%
IMR 3031	<<locked>>	81%	36883	72%	**81	100%
[IMR 4064]*	<<locked>>	81%	34301	67%	**43	93%
[IMR 4166 Enduron]*	<<locked>>	85%	39465	77%	**22	90%
[IMR 4350]*	<<locked>>	94%	41321	80%	**17	90%
[IMR 4451 Enduron]*	<<locked>>	87%	39537	77%	**54	90%
[IMR 4831]*	<<locked>>	91%	31212	61%	**26	90%
IMR 4895	<<locked>>	81%	37797	73%	**84	95%
IMR 8208 XBR	<<locked>>	81%	43294	84%	**59	98%
Lovex D073.6	<<locked>>	81%	39639	77%	**10	99%
Lovex S060	<<locked>>	81%	41655	81%	**77	96%
Lovex S062	<<locked>>	81%	36390	71%	**08	96%
[Lovex S065]*	<<locked>>	86%	34925	68%	**46	90%
[Lovex S070]*	<<locked>>	91%	38145	74%	**51	90%
Norma 201	<<locked>>	81%	40495	79%	**94	97%
Norma 202	<<locked>>	81%	40466	79%	**04	99%
Norma 203B	<<locked>>	81%	36405	71%	**41	95%
[Norma URP]*	<<locked>>	87%	32111	62%	**56	90%
[Ramshot Big Game]*	<<locked>>	81%	35694	69%	**35	94%
[Ramshot Hunter]*	<<locked>>	92%	37594	73%	**90	90%
Ramshot Wild Boar	<<locked>>	81%	42409	82%	**69	97%
ReloadSwiss RS 14	<<locked>>	81%	26643	52%	**31	100%
[ReloadSwiss RS 50]*	<<locked>>	83%	37536	73%	**12	90%
ReloadSwiss RS 52	<<locked>>	81%	34925	68%	**51	96%
[ReloadSwiss RS 60]*	<<locked>>	81%	29124	57%	**84	91%
[ReloadSwiss RS 62]*	<<locked>>	88%	32387	63%	**82	90%
[ReloadSwiss RS 70]*	<<locked>>	90%	35984	70%	**64	90%
Rottweil R 902	<<locked>>	81%	38218	74%	**31	97%
[Rottweil R 903]*	<<locked>>	81%	31444	61%	**07	93%
[Rottweil R 907]*	<<locked>>	90%	41046	80%	**87	90%
[SNPE Vectan SP 11]*	<<locked>>	81%	32880	64%	**69	93%
[SNPE Vectan SP 7]*	<<locked>>	81%	41278	80%	**04	94%
SNPE Vectan SP 9	<<locked>>	81%	39900	77%	**04	96%
SNPE Vectan Tubal 3000	<<locked>>	81%	42105	82%	**67	99%
SNPE Vectan Tubal 5000	<<locked>>	81%	34563	67%	**00	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	90%	38508	75%	**05	90%
[Shooters World Long Rifle]*	<<locked>>	86%	34925	68%	**46	90%
Shooters World Match Rifle	<<locked>>	81%	39639	77%	**10	99%
Shooters World Precision	<<locked>>	81%	36390	71%	**08	96%
Somchem S335	<<locked>>	81%	41655	81%	**67	100%
Somchem S341	<<locked>>	81%	41046	80%	**13	96%
[Somchem S355]*	<<locked>>	81%	32692	63%	**30	94%
[Somchem S365]*	<<locked>>	84%	25875	50%	**79	90%
Vihtavuori N133	<<locked>>	81%	39465	77%	**18	100%
Vihtavuori N135	<<locked>>	81%	31676	62%	**94	99%
Vihtavuori N140	<<locked>>	81%	37565	73%	**22	99%
[Vihtavuori N150]*	<<locked>>	81%	27572	54%	**62	93%
[Vihtavuori N160]*	<<locked>>	84%	32097	62%	**10	90%
Vihtavuori N540	<<locked>>	81%	37202	72%	**38	99%
[Vihtavuori N550]*	<<locked>>	84%	32300	63%	**62	90%
[Vihtavuori N555]*	<<locked>>	94%	29950	58%	**40	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	27949	54%	**49	90%
[Winchester 760]*	<<locked>>	89%	39784	77%	**49	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