SB,
He was using 230 gr. - I don't recall the type/brand. If you do a comparison between an '06 and .375 using this same bullet weight and both being loaded to 2,500 fps, the .375 has an energy advantage at the muzzle of only about 200 fp (at the muzzle). As I recall he had loaded the entire range recommended in his loading manual and couldn't get what was in his mind a decent group. So he began backing off loads and got a one holer somewhere down around 2300 - 2350 fps. When we did the math it turned out that an '06 bullet of the same weight had more fp than did his .375. A 230 gr. bullet in a .375 at about 2400 fps is equal to one out of an '06 going 2500 fps - someone correct me if I'm wrong. All this was corrected when he started going over max published loads. I don't recall his powder. It was only a grain over 'max' and he got the same accuracy results, with a significant increase in energy (2750 fps range I believe). If you don't have a chrony, you don't know what you're shooting. A basic chrony can be had for 100$
Happy New Year to all the big bore fans out there...
Doc