Load data for .257 Roberts + .257 | 87gr | Sierra SPT Pro-Hunter

Recommended Powder(s):

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 87gr \| Sierra SPT Pro-Hunter
Manufacturer SKU:	1610
Bullet Weight:	87gr \| 5.6g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	<<locked>>
Caliber:	.257 Roberts load data
Case Length (l3):	2.233" \| 56.7mm
Cartridge Length (C.O.L.):	<<locked>>
Seated Depth:	<<locked>>
Shank Seated Depth:	<<locked>>
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	51488 psi \| 3550 bar
LID:	LID_B5788_C241
Last updated:	2026-01-23

Load data for 142 loads in caliber .257 Roberts with .257 | 87gr | Sierra SPT Pro-Hunter bullet and 71 powder(s). 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)
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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%	45527	88%	**84	97%
ADI AR 2208	<<locked>>	89%	46006	89%	**77	97%
[Accurate 2700]*	<<locked>>	90%	45803	89%	**86	91%
Accurate 4064	<<locked>>	88%	45527	88%	**91	100%
Accurate 4350	<<locked>>	97%	44628	87%	**30	96%
Alliant Power Pro 2000-MR	<<locked>>	86%	45818	89%	**96	96%
Alliant Reloder- TS 15.5 👍	<<locked>>	90%	46122	90%	**14	98%
Alliant Reloder-15	<<locked>>	87%	45600	89%	**04	97%
Alliant Reloder-16	<<locked>>	97%	44121	86%	**33	96%
Alliant Reloder-17	<<locked>>	93%	45948	89%	**09	98%
Baschieri & Pellagri 107	<<locked>>	84%	45701	89%	**00	96%
Bofors RP3	<<locked>>	89%	45643	89%	**17	98%
[Bofors RP7]*	<<locked>>	92%	45469	88%	**35	92%
Hodgdon CFE223	<<locked>>	88%	45643	89%	**33	96%
Hodgdon H380	<<locked>>	89%	46079	89%	**94	95%
[Hodgdon H414]*	<<locked>>	93%	46122	90%	**46	93%
Hodgdon H4895	<<locked>>	84%	45890	89%	**00	98%
Hodgdon Hybrid 100V	<<locked>>	96%	40437	79%	**99	96%
Hodgdon LVR	<<locked>>	95%	45876	89%	**33	95%
Hodgdon VARGET	<<locked>>	89%	45455	88%	**68	97%
Hodgdon TrailBoss	<<locked>>	97%	33431	65%	**01	100%
IMR 3031	<<locked>>	87%	45469	88%	**17	100%
IMR 4064	<<locked>>	90%	45977	89%	**68	97%
[IMR 4166 Enduron]*	<<locked>>	90%	46064	89%	**22	93%
[IMR 4350]*	<<locked>>	97%	46035	89%	**74	92%
[IMR 4451 Enduron]*	<<locked>>	91%	45948	89%	**51	92%
[IMR 4831]*	<<locked>>	97%	38159	74%	**56	94%
IMR 4895	<<locked>>	86%	45600	89%	**23	97%
Lovex D073.6	<<locked>>	84%	45353	88%	**91	100%
Lovex S060	<<locked>>	84%	45934	89%	**25	97%
Lovex S062	<<locked>>	88%	45818	89%	**74	99%
[Lovex S065]*	<<locked>>	94%	45397	88%	**54	94%
[Lovex S070]*	<<locked>>	95%	45440	88%	**64	93%
Norma 201	<<locked>>	84%	45861	89%	**71	99%
Norma 202	<<locked>>	84%	45745	89%	**74	100%
Norma 203B	<<locked>>	87%	45774	89%	**10	97%
Norma URP	<<locked>>	97%	44788	87%	**23	96%
Ramshot Big Game	<<locked>>	88%	46035	89%	**40	97%
[Ramshot Hunter]*	<<locked>>	97%	44208	86%	**04	93%
ReloadSwiss RS 14	<<locked>>	96%	33330	65%	**41	100%
[ReloadSwiss RS 50]*	<<locked>>	88%	46180	90%	**64	94%
ReloadSwiss RS 52	<<locked>>	85%	45411	88%	**69	97%
ReloadSwiss RS 60 👍	<<locked>>	91%	45977	89%	**19	100%
ReloadSwiss RS 62	<<locked>>	97%	44280	86%	**33	95%
ReloadSwiss RS 70	<<locked>>	97%	45716	89%	**66	95%
Rottweil R 902	<<locked>>	86%	46064	89%	**64	99%
Rottweil R 903	<<locked>>	91%	45571	89%	**00	98%
[Rottweil R 907]*	<<locked>>	92%	45469	88%	**35	92%
SNPE Vectan SP 11	<<locked>>	90%	45716	89%	**33	97%
SNPE Vectan SP 7	<<locked>>	83%	45687	89%	**61	95%
SNPE Vectan SP 9	<<locked>>	85%	45600	89%	**77	97%
SNPE Vectan Tubal 3000	<<locked>>	83%	45730	89%	**95	100%
SNPE Vectan Tubal 5000	<<locked>>	89%	45861	89%	**99	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	94%	45745	89%	**05	93%
[Shooters World Long Rifle]*	<<locked>>	94%	45397	88%	**54	94%
Shooters World Match Rifle	<<locked>>	84%	45353	88%	**91	100%
Shooters World Precision	<<locked>>	88%	45818	89%	**74	99%
Somchem S335	<<locked>>	84%	46050	89%	**05	100%
Somchem S341	<<locked>>	83%	45484	88%	**61	97%
Somchem S355	<<locked>>	91%	46006	89%	**00	98%
Somchem S365	<<locked>>	97%	39943	78%	**64	98%
Vihtavuori N133	<<locked>>	85%	45527	88%	**86	100%
Vihtavuori N135	<<locked>>	93%	46050	89%	**61	100%
Vihtavuori N140	<<locked>>	86%	45556	88%	**38	100%
Vihtavuori N150	<<locked>>	96%	45774	89%	**68	99%
Vihtavuori N160	<<locked>>	94%	45890	89%	**04	96%
Vihtavuori N540	<<locked>>	87%	46180	90%	**87	100%
Vihtavuori N550	<<locked>>	95%	46311	90%	**59	96%
[Vihtavuori N555]*	<<locked>>	97%	33678	65%	**07	92%
Winchester 6.5 StaBALL	<<locked>>	96%	46253	90%	**74	98%
[Winchester 760]*	<<locked>>	93%	46122	90%	**46	93%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2206H	<<locked>>	81%	41858	81%	**02	96%
[ADI AR 2208]*	<<locked>>	81%	35694	69%	**31	93%
[Accurate 2700]*	<<locked>>	87%	42105	82%	**10	90%
Accurate 4064	<<locked>>	81%	35940	70%	**81	99%
[Accurate 4350]*	<<locked>>	87%	31488	61%	**02	90%
[Alliant Power Pro 2000-MR]*	<<locked>>	81%	37927	74%	**95	93%
Alliant Reloder- TS 15.5	<<locked>>	81%	34722	67%	**48	95%
[Alliant Reloder-15]*	<<locked>>	81%	37652	73%	**17	94%
[Alliant Reloder-16]*	<<locked>>	87%	33069	64%	**25	90%
[Alliant Reloder-17]*	<<locked>>	81%	30095	58%	**69	91%
Baschieri & Pellagri 107	<<locked>>	81%	40930	80%	**92	95%
Bofors RP3	<<locked>>	81%	34360	67%	**51	95%
[Bofors RP7]*	<<locked>>	90%	41669	81%	**49	90%
[Hodgdon CFE223]*	<<locked>>	81%	36230	70%	**07	93%
[Hodgdon H380]*	<<locked>>	81%	35563	69%	**54	92%
[Hodgdon H414]*	<<locked>>	88%	39813	77%	**99	90%
Hodgdon H4895	<<locked>>	81%	42177	82%	**18	97%
[Hodgdon Hybrid 100V]*	<<locked>>	85%	28050	54%	**54	90%
[Hodgdon LVR]*	<<locked>>	86%	33997	66%	**41	90%
[Hodgdon VARGET]*	<<locked>>	81%	35360	69%	**22	93%
Hodgdon TrailBoss	<<locked>>	81%	26455	51%	**37	100%
IMR 3031	<<locked>>	81%	37753	73%	**56	100%
[IMR 4064]*	<<locked>>	81%	34679	67%	**05	93%
[IMR 4166 Enduron]*	<<locked>>	85%	39015	76%	**67	90%
[IMR 4350]*	<<locked>>	94%	41365	80%	**69	90%
[IMR 4451 Enduron]*	<<locked>>	87%	39914	78%	**17	90%
[IMR 4831]*	<<locked>>	91%	31386	61%	**72	90%
IMR 4895	<<locked>>	81%	38464	75%	**56	95%
Lovex D073.6	<<locked>>	81%	40756	79%	**89	99%
Lovex S060	<<locked>>	81%	42293	82%	**53	97%
Lovex S062	<<locked>>	81%	37043	72%	**74	96%
[Lovex S065]*	<<locked>>	86%	35418	69%	**08	90%
[Lovex S070]*	<<locked>>	91%	39044	76%	**27	90%
Norma 201	<<locked>>	81%	41133	80%	**59	98%
Norma 202	<<locked>>	81%	41263	80%	**82	99%
Norma 203B	<<locked>>	81%	36898	72%	**10	95%
[Norma URP]*	<<locked>>	87%	32474	63%	**12	90%
[Ramshot Big Game]*	<<locked>>	81%	36434	71%	**13	94%
[Ramshot Hunter]*	<<locked>>	92%	37507	73%	**36	90%
ReloadSwiss RS 14	<<locked>>	81%	26469	51%	**73	100%
[ReloadSwiss RS 50]*	<<locked>>	82%	37434	73%	**67	90%
ReloadSwiss RS 52	<<locked>>	81%	38769	75%	**15	95%
ReloadSwiss RS 60	<<locked>>	81%	32169	62%	**48	95%
[ReloadSwiss RS 62]*	<<locked>>	88%	32837	64%	**41	90%
[ReloadSwiss RS 70]*	<<locked>>	90%	36390	71%	**20	90%
Rottweil R 902	<<locked>>	81%	38943	76%	**00	97%
[Rottweil R 903]*	<<locked>>	81%	32010	62%	**79	94%
[Rottweil R 907]*	<<locked>>	90%	41669	81%	**49	90%
[SNPE Vectan SP 11]*	<<locked>>	81%	33388	65%	**35	93%
[SNPE Vectan SP 7]*	<<locked>>	81%	42047	82%	**82	94%
SNPE Vectan SP 9	<<locked>>	81%	40364	78%	**69	96%
SNPE Vectan Tubal 3000	<<locked>>	81%	42685	83%	**33	99%
SNPE Vectan Tubal 5000	<<locked>>	81%	35302	69%	**69	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	90%	39218	76%	**61	90%
[Shooters World Long Rifle]*	<<locked>>	86%	35418	69%	**08	90%
Shooters World Match Rifle	<<locked>>	81%	40756	79%	**89	99%
Shooters World Precision	<<locked>>	81%	37043	72%	**74	96%
Somchem S335	<<locked>>	81%	42279	82%	**30	100%
Somchem S341	<<locked>>	81%	41800	81%	**89	96%
[Somchem S355]*	<<locked>>	81%	33286	65%	**92	94%
[Somchem S365]*	<<locked>>	84%	26179	51%	**38	90%
Vihtavuori N133	<<locked>>	81%	39798	77%	**74	100%
Vihtavuori N135	<<locked>>	81%	32198	63%	**59	99%
Vihtavuori N140	<<locked>>	81%	38189	74%	**94	99%
[Vihtavuori N150]*	<<locked>>	81%	28166	55%	**31	93%
[Vihtavuori N160]*	<<locked>>	84%	32445	63%	**69	90%
Vihtavuori N540	<<locked>>	81%	38159	74%	**04	99%
[Vihtavuori N550]*	<<locked>>	84%	32227	63%	**02	90%
[Vihtavuori N555]*	<<locked>>	94%	30197	59%	**92	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	28413	55%	**12	90%
[Winchester 760]*	<<locked>>	88%	39813	77%	**99	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