.257 Roberts || .257 | 100gr | Sierra SBT GameKing

Load data for 39 loads in caliber .257 Roberts with .257 | 100gr | Sierra SBT GameKing bullet including underlying parameters such as bullet length, cartridge length and case capacity.

Product number: LID_B5795_C241

Imperial Units Metric Units

Reloading data for caliber .257 Roberts with .257 | 100gr | Sierra SBT GameKing bullet.

Reloading data for caliber .257 Roberts with .257 | 100gr | Sierra SBT GameKing bullet.
Powder	Charge		Max. Pressure		Barrel 23.6''Barrel 60cm		Barrel 18.9''Barrel 48cm
Powder	Weight	FR	psibar	% *	V(0) fpsV(0) m/s	z	V(0) fpsV(0) m/s	z
Accurate 4064	Min:*.	Min:36.6gr36.6gr \| 2.37g	81.0%	43033	2967	84%	2900	884	100%	2756	840	99%
Accurate 4064	Max:*.	Max:37.8gr37.8gr \| 2.45g	83.8%	46267	3190	90%	2986	910	100%	2841	866	99%
Accurate 4350	Min:*.	Min:38.0gr38.0gr \| 2.46g	82.0%	33156	2286	64%	2710	826	92%	2556	779	89%
Accurate 4350	Max:*.	Max:43.2gr43.2gr \| 2.80g	93.7%	45643	3147	89%	3077	938	96%	2920	890	94%
ADI AR 2208	Min:*.	Min:36.3gr36.3gr \| 2.35g	81.0%	40538	2795	79%	2818	859	96%	2677	816	94%
ADI AR 2208	Max:*.	Max:38.4gr38.4gr \| 2.49g	85.9%	46151	3182	90%	2976	907	97%	2828	862	95%
Alliant Reloder- TS 15.5	Min:*.	Min:36.7gr36.7gr \| 2.38g	81.0%	40379	2784	78%	2854	870	97%	2710	826	96%
Alliant Reloder- TS 15.5	Max:*.	Max:38.9gr38.9gr \| 2.52g	85.8%	45919	3166	89%	3009	917	98%	2854	870	97%
Alliant Reloder-15	Min:*.	Min:37.3gr37.3gr \| 2.42g	81.0%	43076	2970	84%	2933	894	97%	2782	848	94%
Alliant Reloder-15	Max:*.	Max:38.6gr38.6gr \| 2.50g	83.7%	46282	3191	90%	3015	919	97%	2871	875	95%
Alliant Reloder-16	Min:*.	Min:37.3gr37.3gr \| 2.42g	83.0%	33997	2344	66%	2733	833	92%	2575	785	89%
Alliant Reloder-16	Max:*.	Max:42.6gr42.6gr \| 2.76g	94.9%	46020	3173	89%	3107	947	96%	2943	897	94%
Alliant Reloder-17	Min:*.	Min:39.2gr39.2gr \| 2.54g	81.0%	35085	2419	68%	2818	859	95%	2648	807	92%
Alliant Reloder-17	Max:*.	Max:43.8gr43.8gr \| 2.84g	90.6%	45788	3157	89%	3150	960	98%	2982	909	96%
Alliant Reloder-23	Min:*.	Min:40.9gr40.9gr \| 2.65g	91.0%	30980	2136	60%	2677	816	92%	2507	764	88%
Alliant Reloder-23	Max:*.	Max:44.0gr44.0gr \| 2.85g	97.5%	36724	2532	71%	2887	880	95%	2720	829	92%
Hodgdon CFE223	Min:*.	Min:40.7gr40.7gr \| 2.64g	81.0%	40698	2806	79%	2936	895	95%	2779	847	92%
Hodgdon CFE223	Max:*.	Max:42.9gr42.9gr \| 2.78g	85.4%	46107	3179	90%	3077	938	96%	2920	890	94%
Hodgdon H380	Min:*.	Min:38.1gr38.1gr \| 2.47g	81.0%	40828	2815	79%	2858	871	94%	2710	826	92%
Hodgdon H380	Max:*.	Max:40.0gr40.0gr \| 2.59g	84.9%	45600	3144	89%	2992	912	96%	2838	865	93%
Hodgdon Hybrid 100V	Min:*.	Min:36.7gr36.7gr \| 2.38g	82.0%	30966	2135	60%	2598	792	93%	2457	749	90%
Hodgdon Hybrid 100V	Max:*.	Max:43.5gr43.5gr \| 2.82g	97.6%	46166	3183	90%	3068	935	98%	2920	890	96%
Hodgdon LVR	Min:*.	Min:38.3gr38.3gr \| 2.48g	83.0%	36332	2505	71%	2789	850	92%	2635	803	89%
Hodgdon LVR	Max:*.	Max:42.3gr42.3gr \| 2.74g	91.7%	45962	3169	89%	3071	936	95%	2904	885	93%
Hodgdon VARGET	Min:*.	Min:36.1gr36.1gr \| 2.34g	81.0%	40175	2770	78%	2805	855	96%	2667	813	94%
Hodgdon VARGET	Max:*.	Max:38.3gr38.3gr \| 2.48g	85.8%	45701	3151	89%	2963	903	97%	2815	858	95%
IMR 4064	Min:*.	Min:35.3gr35.3gr \| 2.29g	81.0%	40204	2772	78%	2799	853	96%	2654	809	94%
IMR 4064	Max:*.	Max:37.5gr37.5gr \| 2.43g	86.1%	45803	3158	89%	2946	898	97%	2812	857	95%
IMR 4166 Enduron	Min:*.	Min:37.0gr37.0gr \| 2.40g	84.0%	42960	2962	83%	2838	865	92%	2690	820	90%
IMR 4166 Enduron	Max:*.	Max:38.3gr38.3gr \| 2.48g	86.7%	46209	3186	90%	2917	889	93%	2772	845	91%
IMR 4831	Min:*.	Min:38.0gr38.0gr \| 2.46g	86.0%	32633	2250	63%	2677	816	92%	2530	771	89%
IMR 4831	Max:*.	Max:43.2gr43.2gr \| 2.80g	97.9%	44382	3060	86%	3031	924	96%	2877	877	93%
Lovex S062	Min:*.	Min:36.3gr36.3gr \| 2.35g	81.0%	42699	2944	83%	2874	876	98%	2736	834	97%
Lovex S062	Max:*.	Max:37.5gr37.5gr \| 2.43g	83.6%	45962	3169	89%	2963	903	99%	2815	858	97%
Lovex S065	Min:*.	Min:37.2gr37.2gr \| 2.41g	82.0%	37275	2570	72%	2726	831	92%	2582	787	89%
Lovex S065	Max:*.	Max:40.9gr40.9gr \| 2.65g	90.7%	46137	3181	90%	2979	908	95%	2825	861	92%
Lovex S070	Min:*.	Min:40.9gr40.9gr \| 2.65g	90.0%	42844	2954	83%	2920	890	92%	2769	844	90%
Lovex S070	Max:*.	Max:42.1gr42.1gr \| 2.73g	92.4%	46078	3177	89%	3002	915	93%	2854	870	90%
Norma 203B	Min:*.	Min:37.3gr37.3gr \| 2.42g	81.0%	42453	2927	82%	2920	890	97%	2769	844	95%
Norma 203B	Max:*.	Max:38.6gr38.6gr \| 2.50g	83.7%	45672	3149	89%	3005	916	98%	2861	872	96%
Norma URP	Min:*.	Min:37.8gr37.8gr \| 2.45g	83.0%	33750	2327	66%	2723	830	92%	2572	784	89%
Norma URP	Max:*.	Max:43.1gr43.1gr \| 2.79g	94.4%	45948	3168	89%	3094	943	96%	2920	890	93%
Ramshot Hunter	Min:*.	Min:43.8gr43.8gr \| 2.84g	92.0%	42032	2898	82%	2989	911	92%	2822	860	89%
Ramshot Hunter	Max:*.	Max:45.4gr45.4gr \| 2.94g	95.3%	45904	3165	89%	3097	944	93%	2933	894	91%
ReloadSwiss RS 50	Min:*.	Min:39.2gr39.2gr \| 2.54g	82.0%	40770	2811	79%	2822	860	92%	2680	817	89%
ReloadSwiss RS 50	Max:*.	Max:41.4gr41.4gr \| 2.68g	86.9%	46151	3182	90%	2972	906	94%	2825	861	91%
ReloadSwiss RS 52	Min:*.	Min:38.6gr38.6gr \| 2.50g	81.0%	40582	2798	79%	2923	891	98%	2769	844	96%
ReloadSwiss RS 52	Max:*.	Max:40.7gr40.7gr \| 2.64g	85.6%	46267	3190	90%	3077	938	99%	2923	891	98%
ReloadSwiss RS 60	Min:*.	Min:39.4gr39.4gr \| 2.55g	81.0%	34708	2393	67%	2818	859	96%	2644	806	92%
ReloadSwiss RS 60	Max:*.	Max:44.3gr44.3gr \| 2.87g	91.1%	46064	3176	89%	3169	966	99%	3009	917	97%
ReloadSwiss RS 62	Min:*.	Min:41.1gr41.1gr \| 2.66g	85.0%	35360	2438	69%	2818	859	92%	2664	812	89%
ReloadSwiss RS 62	Max:*.	Max:45.7gr45.7gr \| 2.96g	95.0%	46137	3181	90%	3150	960	96%	2982	909	93%
ReloadSwiss RS 70	Min:*.	Min:44.8gr44.8gr \| 2.90g	90.0%	40640	2802	79%	2966	904	92%	2805	855	89%
ReloadSwiss RS 70	Max:*.	Max:46.9gr46.9gr \| 3.04g	94.6%	46035	3174	89%	3123	952	94%	2949	899	91%
Rottweil R 903	Min:*.	Min:36.9gr36.9gr \| 2.39g	81.0%	38246	2637	74%	2802	854	97%	2657	810	95%
Rottweil R 903	Max:*.	Max:40.0gr40.0gr \| 2.59g	87.7%	46006	3172	89%	3015	919	98%	2871	875	97%
Shooters World Long Rifle	Min:*.	Min:37.2gr37.2gr \| 2.41g	82.0%	37275	2570	72%	2726	831	92%	2582	787	89%
Shooters World Long Rifle	Max:*.	Max:40.9gr40.9gr \| 2.65g	90.7%	46137	3181	90%	2979	908	95%	2825	861	92%
Shooters World Precision	Min:*.	Min:36.3gr36.3gr \| 2.35g	81.0%	42699	2944	83%	2874	876	98%	2736	834	97%
Shooters World Precision	Max:*.	Max:37.5gr37.5gr \| 2.43g	83.6%	45962	3169	89%	2963	903	99%	2815	858	97%
SNPE Vectan SP 11	Min:*.	Min:38.6gr38.6gr \| 2.50g	81.0%	38406	2648	75%	2848	868	96%	2697	822	93%
SNPE Vectan SP 11	Max:*.	Max:41.7gr41.7gr \| 2.70g	87.5%	45933	3167	89%	3068	935	97%	2904	885	95%
Somchem S355	Min:*.	Min:36.6gr36.6gr \| 2.37g	81.0%	41582	2867	81%	2887	880	97%	2743	836	95%
Somchem S355	Max:*.	Max:38.1gr38.1gr \| 2.47g	84.5%	45600	3144	89%	2992	912	98%	2848	868	96%
Somchem S365	Min:*.	Min:37.2gr37.2gr \| 2.41g	81.0%	34214	2359	66%	2822	860	97%	2651	808	94%
Somchem S365	Max:*.	Max:42.1gr42.1gr \| 2.73g	91.9%	46166	3183	90%	3189	972	99%	3018	920	98%
Vihtavuori N135	Min:*.	Min:35.3gr35.3gr \| 2.29g	81.0%	41307	2848	80%	2818	859	100%	2684	818	100%
Vihtavuori N135	Max:*.	Max:36.9gr36.9gr \| 2.39g	84.6%	45440	3133	88%	2917	889	100%	2789	850	100%
Vihtavuori N140	Min:*.	Min:36.9gr36.9gr \| 2.39g	81.0%	40843	2816	79%	2805	855	98%	2674	815	97%
Vihtavuori N140	Max:*.	Max:38.7gr38.7gr \| 2.51g	84.9%	45658	3148	89%	2930	893	99%	2789	850	98%
Vihtavuori N150	Min:*.	Min:36.9gr36.9gr \| 2.39g	81.0%	36927	2546	72%	2726	831	98%	2585	788	96%
Vihtavuori N150	Max:*.	Max:40.6gr40.6gr \| 2.63g	89.0%	46122	3180	90%	2969	905	99%	2835	864	98%
Vihtavuori N550	Min:*.	Min:39.0gr39.0gr \| 2.53g	83.0%	34432	2374	67%	2730	832	92%	2579	786	89%
Vihtavuori N550	Max:*.	Max:44.0gr44.0gr \| 2.85g	93.4%	45817	3159	89%	3058	932	95%	2900	884	93%
Vihtavuori N555	Min:*.	Min:40.6gr40.6gr \| 2.63g	90.0%	32227	2222	63%	2743	836	92%	2589	789	89%
Vihtavuori N555	Max:*.	Max:44.0gr44.0gr \| 2.85g	97.5%	39088	2695	76%	2982	909	95%	2812	857	92%
Winchester 6.5 StaBall	Min:*.	Min:40.1gr40.1gr \| 2.60g	81.0%	32662	2252	63%	2631	802	94%	2480	756	91%
Winchester 6.5 StaBall	Max:*.	Max:46.3gr46.3gr \| 3.00g	93.3%	46166	3183	90%	3035	925	98%	2874	876	96%

FR ... fill rate of the cartridge
%* ... max pressure of load in percent of the maximum allowed pressure for this caliber
z ... powder burnt in percent

... cells marked in yellow are not dangerous but indicate possible (but not necessary) suboptimal characteristics such as extensive muzzle flash or inaccurate loads.

IMORTANT: Scale down to 90% when printing to ensure the load table gets displayed correctly!

Caliber:	.257 Roberts
Propellant:	ADI AR 2208, Accurate 4064, Accurate 4350, Alliant Reloder-15, Alliant Reloder-16, Alliant Reloder-17, Alliant Reloder-23, Alliant Reloder- TS 15.5, Hodgdon CFE223, Hodgdon H380, Hodgdon Hybrid 100V, Hodgdon LVR, Hodgdon VARGET, IMR 4064, IMR 4166 Enduron, IMR 4831, Lovex S062, Lovex S065, Lovex S070, Norma 203B, Norma URP, Ramshot Hunter, ReloadSwiss RS 50, ReloadSwiss RS 52, ReloadSwiss RS 60, ReloadSwiss RS 62, ReloadSwiss RS 70, Rottweil R 903, SNPE Vectan SP 11, Shooters World Long Rifle, Shooters World Precision, Somchem S355, Somchem S365, Vihtavuori N135, Vihtavuori N140, Vihtavuori N150, Vihtavuori N550, Vihtavuori N555, Winchester 6.5 StaBall
Bullet Weight:	100 gr \| 6.5 g
Bullet Diameter:	0.257 '' \| 6.53 mm
Primer Size:	Large Rifle (LR)
Bullet Length:	0.99 '' \| 25.2 mm
Case Length (l3):	2.23 '' \| 56.7 mm
Cartridge Length / OAL:	2.73 '' \| 69.4 mm
Seated Depth:	0.49 '' \| 12.5 mm
Case Capacity:	56 Grains of Water \| 3.64 cm3

Sierra Bullets

For over 70 years, Sierra Bullets has been dedicated to the manufacture of the most accurate bullets in the world. This commitment to performance has established a “Tradition of Precision” for which we’re known throughout the world.

Over the years, much has changed in the industry and in the marketplace. What hasn’t changed has been our focus on bullets. Hunting and target bullets for rifles and handguns are the only products we make, and we work hard to make them better than anyone else.

If you consider the large number of serious marksmen and hunters who use nothing but Sierra and their many accuracy records, we believe we accomplish our objective of a better bullet.

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.257 Roberts || .257 | 100gr | Sierra SBT GameKing

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