257 Roberts Improved

Nomad

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Jul 1, 2007
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Idaho
Just got a 257 plan on using it for varmints, pronghorn, and deer.
Plan on using a 100gr bullet for all, could use some load data for
the 100gr or something close ... Thanks
 
257 Robers Ackley Improved
100gr bullets

Powder--- min load gr./fps.--- max load gr./fps
4895------ 36.3/ 2800-------- 43.5/ 3200
Varget---- 37.6/ 2900-------- 44.2/ 3200
4064------ 35.9/ 2800-------- 43.5/ 3200
RL-15----- 39.1/ 3000-------- 44.1/ 3200
4350------ 45.2/ 3000-------- 48.0/ 3200
RL-19----- 45.8/3000--------- 50.4/ 3200
4831------ 47.3/ 3000-------- 50.4/3200

This is from the Sierra Manual.
 
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