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Rifles, Reloading, Optics, Equipment
Reloading
Trouble Loading for a 257 Wheatherby
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<blockquote data-quote="fishingstockwell" data-source="post: 1208571" data-attributes="member: 96590"><p>Thanks to everyone for all the responses. Your information has certainly helped me rethink what to try next with this project. Norma's load data shows 69.0-72.4 grains of MRP for the 100 gr Nosler Ballistic Tip and 66.0-69.8 for a 117 gr Hornady round nose bullet. I'm going to pick up a pound of MRP and try loading the Accubond 110 with about 68.0-70.0 grains with the Weatherby factory seating depth provided by MudRunner. I don't know how temperature stable MRP is, but RL 22 is well know for wide velocity swings with temp changes. I have had great luck loading very accurate loads with RL 22, but I live near Sacramento, CA and load development during the summer is done around 90 degrees. I've been reluctant to use it for my hunting loads because we typically hunt the other western states and average temperatures are roughly 50 degrees, or more, lower. I have heard that RL 23 is a very temperature stable powder, with an almost identical burn rate to 22, but alliant shows no load data for the 257 Wby. I might give them a call to see if there is a conversion for 22 to 23, and give that a try as well. Thanks again for all the suggestions. </p><p></p><p>Matt</p></blockquote><p></p>
[QUOTE="fishingstockwell, post: 1208571, member: 96590"] Thanks to everyone for all the responses. Your information has certainly helped me rethink what to try next with this project. Norma's load data shows 69.0-72.4 grains of MRP for the 100 gr Nosler Ballistic Tip and 66.0-69.8 for a 117 gr Hornady round nose bullet. I'm going to pick up a pound of MRP and try loading the Accubond 110 with about 68.0-70.0 grains with the Weatherby factory seating depth provided by MudRunner. I don't know how temperature stable MRP is, but RL 22 is well know for wide velocity swings with temp changes. I have had great luck loading very accurate loads with RL 22, but I live near Sacramento, CA and load development during the summer is done around 90 degrees. I've been reluctant to use it for my hunting loads because we typically hunt the other western states and average temperatures are roughly 50 degrees, or more, lower. I have heard that RL 23 is a very temperature stable powder, with an almost identical burn rate to 22, but alliant shows no load data for the 257 Wby. I might give them a call to see if there is a conversion for 22 to 23, and give that a try as well. Thanks again for all the suggestions. Matt [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Trouble Loading for a 257 Wheatherby
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