Hey Point Blank,
Before you go buy a keg of IMR, you might want to consider the Hodgdon version of 4895. I have found the Hodgdon "Extreme" powders to be very clean burning with good velocity and good accuracy in most applications. They are also billed as being "temperature insensitive" which I can attest to firsthand (90 degrees or snow on the ground, same group size, same POI).
I will concur with those saying get ahold of as many reloading manuals as you can. Also, many powder manufacturers will have data online. Usually it is pretty basic, but it will give you a basis for comparison.
HTH,
Sub
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