HELP.. Imr 4350 Swift Aframe 300 Grain .375 h&h Load Data

71.5-76.5 according to loaddata.com. My guess would be 73 would get it done. My experience with swift bullets is they don't like to be moving super fast with maxed out loads.
 
I wouldn't assume the H and IMR data is interchangeable. Start getting close to 80 with IMR 4350 my guess is your going to be seeing signs of pressure.
 
NO, while they are close they are not interchangeable. Use the data published for each. My suggestion is to try H4350 instead of IMR4350- not to interchanged the data! H4350 is an extreme powder so is temperature insensitive.
 
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