Load data for .257 Roberts + .257 | 100gr | Peregrine Glider GRM

Recommended Powder(s): Alliant Reloder- TS 15.5, Alliant Reloder-17, ReloadSwiss RS 60, Rottweil R 903, Somchem S355

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.257 \| 100gr \| Peregrine Glider GRM
Bullet Weight:	100gr \| 6.5g
Bullet Diameter:	0.257" \| 6.53mm
Bullet Length:	1.280" \| 32.5mm
Caliber:	.257 Roberts load data
Case Length (l3):	2.233" \| 56.7mm
Cartridge Length (C.O.L.):	2.733" \| 69.4mm
Seated Depth:	0.780" \| 19.8mm
Shank Seated Depth:	0.579" \| 14.7mm
Case Capacity:	56.0 Grains of Water \| 3.64 cm³
Primer Size:	Large Rifle (LR)
Max. allowed Pressure:	51488 psi \| 3550 bar
LID:	LID_B8047_C241
Last updated:	2025-01-01
Recommended Twist Rate:	1:8 - 1:7

Load data for 146 loads in caliber .257 Roberts with .257 | 100gr | Peregrine Glider GRM bullet and 73 powders such as Alliant Reloder- TS 15.5, Alliant Reloder-17, ReloadSwiss RS 60, Rottweil R 903, Somchem S355. 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)
No data yet
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 2206H	<<locked>>	84%	45948	89%	**87	98%
ADI AR 2208	<<locked>>	89%	45643	89%	**58	97%
Accurate 2495	<<locked>>	83%	45542	88%	**64	100%
Accurate 2520	<<locked>>	83%	46267	90%	**97	100%
[Accurate 2700]*	<<locked>>	90%	46079	89%	**92	93%
Accurate 4064	<<locked>>	89%	46296	90%	**97	100%
Accurate 4350	<<locked>>	97%	44599	87%	**27	97%
Alliant Reloder- TS 15.5 👍	<<locked>>	90%	45919	89%	**00	99%
Alliant Reloder-15	<<locked>>	88%	46282	90%	**07	98%
Alliant Reloder-16	<<locked>>	97%	44005	85%	**30	97%
Alliant Reloder-17 👍	<<locked>>	93%	45542	88%	**86	99%
[Alliant Reloder-23]*	<<locked>>	97%	31125	60%	**15	93%
Baschieri & Pellagri 107	<<locked>>	84%	45861	89%	**97	97%
Hodgdon CFE223	<<locked>>	88%	46137	90%	**46	97%
Hodgdon H380	<<locked>>	89%	45847	89%	**84	96%
[Hodgdon H414]*	<<locked>>	93%	45890	89%	**33	94%
[Hodgdon H4350]*	<<locked>>	97%	42598	83%	**02	92%
Hodgdon Hybrid 100V	<<locked>>	97%	40625	79%	**15	97%
Hodgdon LVR	<<locked>>	95%	45716	89%	**30	96%
[Hodgdon Superperformance]*	<<locked>>	95%	46282	90%	**49	93%
Hodgdon VARGET	<<locked>>	89%	45643	89%	**58	97%
Hodgdon TrailBoss	<<locked>>	96%	32895	64%	**18	100%
IMR 3031	<<locked>>	87%	45847	89%	**07	100%
IMR 4064	<<locked>>	90%	45890	89%	**58	98%
[IMR 4166 Enduron]*	<<locked>>	90%	45934	89%	**18	94%
[IMR 4350]*	<<locked>>	96%	45034	87%	**48	93%
[IMR 4451 Enduron]*	<<locked>>	92%	46267	90%	**51	94%
IMR 4831	<<locked>>	97%	37768	73%	**59	95%
IMR 4895	<<locked>>	86%	45310	88%	**04	98%
Lovex D073.6	<<locked>>	85%	45730	89%	**87	100%
Lovex S060	<<locked>>	84%	46296	90%	**22	98%
Lovex S062	<<locked>>	88%	45803	89%	**67	99%
Lovex S065	<<locked>>	94%	45876	89%	**54	95%
[Lovex S070]*	<<locked>>	96%	46180	90%	**81	94%
Norma 201	<<locked>>	85%	46064	89%	**58	99%
Norma 202	<<locked>>	85%	46021	89%	**61	100%
Norma 203B	<<locked>>	88%	45469	88%	**94	98%
Norma URP	<<locked>>	97%	44672	87%	**23	97%
Ramshot Big Game	<<locked>>	88%	45585	89%	**20	98%
[Ramshot Hunter]*	<<locked>>	96%	43207	84%	**81	94%
Ramshot Wild Boar	<<locked>>	83%	46050	89%	**97	98%
ReloadSwiss RS 14	<<locked>>	96%	33315	65%	**60	100%
ReloadSwiss RS 50	<<locked>>	89%	46224	90%	**67	95%
ReloadSwiss RS 52	<<locked>>	89%	46050	89%	**46	99%
ReloadSwiss RS 60 👍	<<locked>>	94%	45339	88%	**95	99%
ReloadSwiss RS 62	<<locked>>	96%	43497	84%	**23	96%
ReloadSwiss RS 70	<<locked>>	96%	44614	87%	**43	95%
Rottweil R 902	<<locked>>	86%	45745	89%	**41	99%
Rottweil R 903 👍	<<locked>>	92%	45948	89%	**00	99%
[Rottweil R 907]*	<<locked>>	93%	45745	89%	**38	93%
SNPE Vectan SP 11	<<locked>>	91%	45890	89%	**30	98%
SNPE Vectan SP 7	<<locked>>	84%	45803	89%	**54	96%
SNPE Vectan SP 9	<<locked>>	85%	46079	89%	**81	98%
SNPE Vectan Tubal 3000	<<locked>>	83%	45861	89%	**85	100%
SNPE Vectan Tubal 5000	<<locked>>	90%	45832	89%	**85	100%
[SNPE Vectan Tubal 7000]*	<<locked>>	95%	46195	90%	**15	94%
Shooters World Long Rifle	<<locked>>	94%	45876	89%	**54	95%
Shooters World Match Rifle	<<locked>>	85%	45730	89%	**87	100%
Shooters World Precision	<<locked>>	88%	45803	89%	**67	99%
Somchem S335	<<locked>>	84%	46093	90%	**95	100%
Somchem S341	<<locked>>	84%	45658	89%	**54	98%
Somchem S355 👍	<<locked>>	91%	46050	89%	**97	99%
Somchem S365	<<locked>>	96%	39276	76%	**48	98%
Vihtavuori N133	<<locked>>	86%	46166	90%	**89	100%
Vihtavuori N135	<<locked>>	92%	45368	88%	**38	100%
Vihtavuori N140	<<locked>>	86%	45527	88%	**38	100%
Vihtavuori N150	<<locked>>	96%	45542	88%	**54	99%
Vihtavuori N160	<<locked>>	95%	45919	89%	**97	97%
Vihtavuori N540	<<locked>>	87%	45614	89%	**64	100%
Vihtavuori N550	<<locked>>	95%	45934	89%	**46	97%
[Vihtavuori N555]*	<<locked>>	97%	33069	64%	**03	93%
Winchester 6.5 StaBALL	<<locked>>	96%	46296	90%	**84	99%
[Winchester 760]*	<<locked>>	93%	45890	89%	**33	94%

Max Load - Barrel Length: 23.60''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AR 2206H	<<locked>>	81%	41713	81%	**02	97%
[ADI AR 2208]*	<<locked>>	81%	35404	69%	**35	94%
Accurate 2495	<<locked>>	81%	42105	82%	**05	100%
Accurate 2520	<<locked>>	81%	42931	83%	**35	100%
[Accurate 2700]*	<<locked>>	85%	39218	76%	**54	90%
Accurate 4064	<<locked>>	81%	35418	69%	**77	99%
[Accurate 4350]*	<<locked>>	85%	28819	56%	**49	90%
Alliant Reloder- TS 15.5	<<locked>>	81%	34592	67%	**54	96%
Alliant Reloder-15	<<locked>>	81%	37507	73%	**23	95%
[Alliant Reloder-16]*	<<locked>>	85%	30414	59%	**69	90%
[Alliant Reloder-17]*	<<locked>>	81%	30037	58%	**89	92%
[Alliant Reloder-23]*	<<locked>>	93%	27876	54%	**07	90%
Baschieri & Pellagri 107	<<locked>>	81%	40886	79%	**99	96%
[Hodgdon CFE223]*	<<locked>>	81%	35766	69%	**13	94%
[Hodgdon H380]*	<<locked>>	81%	35244	68%	**54	93%
[Hodgdon H414]*	<<locked>>	87%	37246	72%	**43	90%
[Hodgdon H4350]*	<<locked>>	94%	38928	76%	**13	90%
[Hodgdon Hybrid 100V]*	<<locked>>	83%	26063	51%	**11	90%
[Hodgdon LVR]*	<<locked>>	83%	31401	61%	**85	90%
[Hodgdon Superperformance]*	<<locked>>	91%	40306	78%	**18	90%
[Hodgdon VARGET]*	<<locked>>	81%	35404	69%	**35	94%
Hodgdon TrailBoss	<<locked>>	81%	26179	51%	**63	100%
IMR 3031	<<locked>>	81%	37420	73%	**40	100%
[IMR 4064]*	<<locked>>	81%	34490	67%	**05	94%
[IMR 4166 Enduron]*	<<locked>>	82%	36419	71%	**05	90%
[IMR 4350]*	<<locked>>	91%	38377	75%	**07	90%
[IMR 4451 Enduron]*	<<locked>>	85%	36970	72%	**44	90%
[IMR 4831]*	<<locked>>	88%	29109	57%	**30	90%
IMR 4895	<<locked>>	81%	38319	74%	**53	96%
Lovex D073.6	<<locked>>	81%	40379	78%	**82	99%
Lovex S060	<<locked>>	81%	42380	82%	**46	97%
Lovex S062	<<locked>>	81%	37028	72%	**84	97%
[Lovex S065]*	<<locked>>	83%	32416	63%	**46	90%
[Lovex S070]*	<<locked>>	88%	35636	69%	**51	90%
Norma 201	<<locked>>	81%	40756	79%	**56	98%
Norma 202	<<locked>>	81%	40973	80%	**69	100%
Norma 203B	<<locked>>	81%	36883	72%	**10	96%
[Norma URP]*	<<locked>>	84%	29820	58%	**52	90%
Ramshot Big Game	<<locked>>	81%	36071	70%	**13	95%
[Ramshot Hunter]*	<<locked>>	89%	34505	67%	**77	90%
Ramshot Wild Boar	<<locked>>	81%	43018	84%	**31	97%
ReloadSwiss RS 14	<<locked>>	81%	26672	52%	**13	100%
[ReloadSwiss RS 50]*	<<locked>>	81%	35853	70%	**31	91%
ReloadSwiss RS 52	<<locked>>	81%	35201	68%	**20	97%
[ReloadSwiss RS 60]*	<<locked>>	81%	29399	57%	**75	93%
[ReloadSwiss RS 62]*	<<locked>>	86%	30647	60%	**02	90%
[ReloadSwiss RS 70]*	<<locked>>	88%	33881	66%	**71	90%
Rottweil R 902	<<locked>>	81%	38928	76%	**07	98%
Rottweil R 903	<<locked>>	81%	31807	62%	**85	95%
[Rottweil R 907]*	<<locked>>	87%	38101	74%	**77	90%
[SNPE Vectan SP 11]*	<<locked>>	81%	33098	64%	**41	94%
SNPE Vectan SP 7	<<locked>>	81%	41756	81%	**72	95%
SNPE Vectan SP 9	<<locked>>	81%	40161	78%	**59	97%
SNPE Vectan Tubal 3000	<<locked>>	81%	42656	83%	**26	100%
SNPE Vectan Tubal 5000	<<locked>>	81%	35041	68%	**75	99%
[SNPE Vectan Tubal 7000]*	<<locked>>	87%	36013	70%	**08	90%
[Shooters World Long Rifle]*	<<locked>>	83%	32416	63%	**46	90%
Shooters World Match Rifle	<<locked>>	81%	40379	78%	**82	99%
Shooters World Precision	<<locked>>	81%	37028	72%	**84	97%
Somchem S335	<<locked>>	81%	42061	82%	**20	100%
Somchem S341	<<locked>>	81%	41597	81%	**79	97%
Somchem S355	<<locked>>	81%	32967	64%	**02	95%
[Somchem S365]*	<<locked>>	81%	23975	47%	**88	90%
Vihtavuori N133	<<locked>>	81%	39972	78%	**74	100%
Vihtavuori N135	<<locked>>	81%	32010	62%	**59	100%
Vihtavuori N140	<<locked>>	81%	38435	75%	**90	100%
[Vihtavuori N150]*	<<locked>>	81%	28094	55%	**44	94%
[Vihtavuori N160]*	<<locked>>	82%	29849	58%	**20	90%
Vihtavuori N540	<<locked>>	81%	37884	74%	**07	99%
[Vihtavuori N550]*	<<locked>>	82%	29994	58%	**56	90%
[Vihtavuori N555]*	<<locked>>	92%	27963	54%	**49	90%
[Winchester 6.5 StaBALL]*	<<locked>>	81%	28253	55%	**44	92%
[Winchester 760]*	<<locked>>	87%	37246	72%	**43	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