Quick Load Request - 257 Roberts 100gr E-Tip

Scrumbag

Beginner
Feb 22, 2021
116
25
Hi folks,

Would someone be kind enough to run a 257 Roberts+P with the 100gr E-Tip for me? (COAL 2.77")

Happy to take recommendations on what a safe max pressure is for 257 Roberts + P.

Many thanks,

Scrummy
 

DrMike

Ballistician
Nov 8, 2006
35,235
1,811
Cartridge : .257 Roberts +P+ (not SAAMI)
Bullet : .257, 100, Nosler E-Tip 59456
Useable Case Capaci: 47.569 grain H2O = 3.089 cm³
Cartridge O.A.L. L6: 2.770 inch = 70.36 mm
Barrel Length : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 58000 psi, or 399 MPa
or a maximum loading ratio or filling of 112 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

6 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Alliant Reloder-26 *C 109.7 51.7 3.35 3329 99.4 58000 11879 1.069 ! Near Maximum !
ReloadSwiss RS 60 *T 99.9 45.9 2.98 3285 100.0 58000 10697 1.065 ! Near Maximum !
Norma MRP *C 110.1 50.4 3.27 3284 97.2 58000 11673 1.071 ! Near Maximum !
Elcho 17 99.0 45.5 2.95 3263 100.0 58000 10642 1.071 ! Near Maximum !
Alliant Reloder-17 *T 99.0 45.5 2.95 3263 100.0 58000 10642 1.071 ! Near Maximum !
ReloadSwiss RS 70 *C 102.5 47.9 3.10 3259 99.0 58000 11073 1.068 ! Near Maximum !
Vihtavuori N560 *C 111.6 50.0 3.24 3251 93.3 58000 11565 1.072 ! Near Maximum !
Vihtavuori N555 *C*T 111.5 48.0 3.11 3247 99.7 58000 10804 1.094 ! Near Maximum !
Alliant Reloder-16 *C *T 103.9 44.4 2.87 3244 99.6 58000 10597 1.068 ! Near Maximum !
Bofors RL16 TZ *C *T 103.9 44.4 2.87 3244 99.6 58000 10597 1.068 ! Near Maximum !
Bofors RP5/NP ~approximation 112.0 49.6 3.22 3242 95.7 57852 11315 1.076 ! Near Maximum !
Raufoss RA15 *C 112.0 49.6 3.22 3242 95.7 57852 11315 1.076 ! Near Maximum !
Alliant Reloder-22 *C 112.0 49.6 3.22 3242 95.7 57852 11315 1.076 ! Near Maximum !
Somchem S365 106.4 46.4 3.01 3241 100.0 58000 10166 1.080 ! Near Maximum !
Accurate MAGPRO 112.0 52.2 3.38 3234 91.4 57985 11492 1.077 ! Near Maximum !
ReloadSwiss RS 62 102.7 47.2 3.06 3225 99.2 58000 10657 1.089 ! Near Maximum !
IMR 7828 SSC 109.5 49.3 3.20 3218 93.4 58000 11147 1.069 ! Near Maximum !
PB Clermont PCL 511 100.3 46.9 3.04 3211 98.2 58000 10686 1.080 ! Near Maximum !
PB Clermont PCL 518 104.5 47.3 3.07 3211 97.8 58000 10722 1.080 ! Near Maximum !
Ramshot Hunter 103.7 46.9 3.04 3209 98.1 58000 10669 1.081 ! Near Maximum !
Winchester 760 97.8 45.4 2.94 3201 97.4 58000 10634 1.084 ! Near Maximum !
Hodgdon H414 97.8 45.4 2.94 3201 97.4 58000 10634 1.084 ! Near Maximum !
ADI AR 2213 110.2 48.9 3.17 3199 93.2 58000 11000 1.070 ! Near Maximum !
Norma URP *C 103.2 44.8 2.90 3198 99.3 58000 10369 1.087 ! Near Maximum !
Bofors RP19 ~approximation 103.2 44.8 2.90 3198 99.3 58000 10366 1.087 ! Near Maximum !
Accurate 4350 102.7 45.0 2.92 3197 99.3 58000 10382 1.102 ! Near Maximum !
Vihtavuori N550 *C*T 100.1 44.9 2.91 3195 99.2 58000 10471 1.093 ! Near Maximum !
Alliant Reloder-19 *C 108.1 47.4 3.07 3194 95.5 58000 10740 1.077 ! Near Maximum !
Ramshot Magnum 110.9 53.0 3.43 3189 95.9 58000 10761 1.073 ! Near Maximum !
Hodgdon LVR 100.5 44.0 2.85 3189 98.9 58000 10298 1.084 ! Near Maximum !
ADI AR 2209 107.2 46.7 3.03 3186 95.2 58000 10632 1.072 ! Near Maximum !
Bofors RP14 ~approximation 108.8 47.7 3.09 3186 95.5 58000 10652 1.078 ! Near Maximum !
IMR 4831 108.4 45.5 2.95 3179 99.4 58000 10163 1.095 ! Near Maximum !
Alliant Reloder-23 *C *T 112.0 48.0 3.11 3177 99.9 53410 10528 1.114 ! Near Maximum !
Bofors RP36 ZT *C *T 112.0 48.0 3.11 3177 99.9 53410 10528 1.114 ! Near Maximum !
Hodgdon Hybrid 100V 106.1 45.0 2.92 3167 100.0 58000 9632 1.083 ! Near Maximum !
Bofors RP4 ~approximation 105.7 46.3 3.00 3166 95.2 58000 10427 1.079 ! Near Maximum !
Raufoss RA4 105.7 46.3 3.00 3166 95.2 58000 10427 1.079 ! Near Maximum !
Norma 204 *C 102.4 46.3 3.00 3166 95.2 58000 10427 1.079 ! Near Maximum !
Somchem S385 108.5 48.1 3.12 3161 96.6 58000 10366 1.096 ! Near Maximum !
Rottweil R905 112.0 48.7 3.16 3158 92.7 55976 10721 1.095 ! Near Maximum !
Accurate 3100 112.0 49.1 3.18 3152 98.0 57450 10219 1.109 ! Near Maximum !
Bofors RP4 NT *C ~approximation 103.3 46.0 2.98 3151 97.0 58000 10199 1.091 ! Near Maximum !
Bofors RP3 95.5 42.4 2.74 3151 100.0 58000 9704 1.108 ! Near Maximum !
Norma 203 old 95.5 42.4 2.74 3151 100.0 58000 9704 1.108 ! Near Maximum !
Vihtavuori N160 *C 100.0 44.8 2.90 3150 99.2 58000 9810 1.089 ! Near Maximum !
SNPE Vectan SP 12 112.0 52.4 3.40 3150 92.8 54500 11110 1.101 ! Near Maximum !
Hodgdon H4831 SC *T 108.9 48.3 3.13 3145 92.7 58000 10345 1.078 ! Near Maximum !
Rottweil R903 97.7 42.4 2.75 3144 100.0 58000 9630 1.108 ! Near Maximum !
Hodgdon H380 94.9 42.5 2.75 3144 99.0 58000 9946 1.100 ! Near Maximum !
PB Clermont PCL 517 112.0 52.4 3.40 3143 92.5 54193 11096 1.104 ! Near Maximum !
Bofors RP15 112.0 48.6 3.15 3141 94.1 52458 11013 1.126 ! Near Maximum !
Winchester WXR 112.0 48.6 3.15 3141 94.1 52458 11013 1.126 ! Near Maximum !
Somchem S355 97.6 41.9 2.71 3136 99.9 58000 9612 1.103 ! Near Maximum !
Shooters World SW4350 102.3 44.4 2.88 3136 97.5 58000 10068 1.102 ! Near Maximum !
Lovex S070 102.3 44.4 2.88 3136 97.5 58000 10068 1.102 ! Near Maximum !
Winchester Supreme 780 106.3 49.1 3.18 3136 95.2 58000 10132 1.082 ! Near Maximum !
Rottweil R904 106.2 45.9 2.98 3126 93.9 58000 10065 1.084 ! Near Maximum !
Lovex D073.6 90.5 40.9 2.65 3121 100.0 58000 9107 1.111 ! Near Maximum !
Shooters World Match Rifle 90.5 40.9 2.65 3121 100.0 58000 9107 1.111 ! Near Maximum !
Accurate 4064 95.2 40.9 2.65 3119 100.0 58000 9099 1.129 ! Near Maximum !
Lovex S065 100.9 43.3 2.81 3116 98.4 58000 9766 1.103 ! Near Maximum !
Shooters World Long Rifle 100.9 43.3 2.81 3116 98.4 58000 9766 1.103 ! Near Maximum !
IMR 4955 Enduron *C*T 109.8 46.8 3.03 3110 93.2 58000 10035 1.086 ! Near Maximum !
Rottweil R907 99.5 42.8 2.78 3106 96.6 58000 9808 1.099 ! Near Maximum !
Bofors RP7 99.5 42.8 2.78 3106 96.6 58000 9808 1.099 ! Near Maximum !
IMR 4007 SSC 96.4 42.9 2.78 3106 96.6 58000 9801 1.099 ! Near Maximum !
Hodgdon H4831 *T 112.0 47.7 3.09 3105 92.1 55678 10221 1.098 ! Near Maximum !
Bofors RP5 NT *C ~approximation 112.0 50.1 3.24 3090 89.4 54835 10420 1.105 ! Near Maximum !
IMR 7828 112.0 47.7 3.09 3090 91.3 51214 10735 1.132 ! Near Maximum !
ADI AP 2214 112.0 51.0 3.30 3089 91.6 54035 10556 1.108 ! Near Maximum !
Somchem S361 104.9 49.0 3.18 3082 92.8 58000 9772 1.097 ! Near Maximum !

SAAMI maximum chamber pressure is 58000 psi. One can push pressure, especially if the firearm is a modern build; but you really won't gain enough velocity to justify pushing it higher.
 

Scrumbag

Beginner
Feb 22, 2021
116
25
Hi folks,

Well, tried 42.5gr of Reload Swiss RS 60 (~92% case fill with by cases) and got rather dirty cases.

a1iKVxdl.png


Group wasn't bad though.

qk68eQGl.jpg


I tried the next GRT predicted load (44.0gr) and not a good group but cleaner cases.

So, what do we think:

Same powder, change charge?
Try a slightly faster powder?
Go from a standard Large Rifle Primer to a Magnum?

Thoughts appreciated folks.

Scrummy
 
Top