Military Surplus reloading

[Wes Sage]

I am reloading Lake City brass for my M1A. Using Hornaday reloading manual number ten. Manual list of recommend powder has Winchester 748 listed. I have a good supply of this powder. Going to use 42.9 gr of powder and a 155 gr BTHP Match. I’m trying to reduce recoil and am only shooting 300 yards. Can anyone recommend this plan?

What is the low and high end charges? Remember with Military LC brass, the case volume is reduced, so pressures build faster.