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What primer are you using, and how many grains of Retumbo with your Berger 215 grain Hybrids? I'm using a factory Remington 700 barreled action with a 5R 1:10 twist. I've installed a Wyatts extended magazine box allowing me to seat the bullets out to 3.825" if necessary. Thank you in advance for your help.
You do realize his posts are over 5 years old?
 
You will likely get way more discussion by starting a new thread specific to your question than reviving a 5 yr old thread.
 
Warning! This thread is more than 4 years ago old.
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