Welcome SGW
Since you are from Texas the Dallas Safari Club convention (January 5 to 8, 2023) might be a better (closer) option. We (DE KLERK SAFARIS) have booths at both conventions (DSC as well as SCI) but to be honest with you, we just love the Texan hospitality we receive from DSC.
Regarding your (and another hunter's) question about scopes for the 375 I will tell you what I did with my 375 (Winchester Model 70). I got some quick detachable mounts made by Talley and I have a 1-6 power Swarovsky scope on the rifle.
That way you can shoot dangerous game at 1 or 2 power and plains game using 4 to 6 power (which is more than adequate for up to 200 yards). You can also take the scope completely off in just a minute (no tools required) if you are entering thick forest or tall reeds following a wounded animal and just use the rifle with it's open iron sights.
The scope comes back to zero perfectly no matter how many times you take it off or put it back on.
If you are going to use the 375 for plains game then you can experiment with lighter bullets, but if you are going for buffalo I will just stick with the 300 grains and use the same load for plains game.
I have seen many hunters bringing different loads to Africa and they shoot at different point of impact at 100 yards and then they get confused as to which bullet is now in the rifle and where does that bullet shoot. So keep it simple - test many different bullets and once you determined what your rifle likes just stick to that load.
Other advice I can give you, is to load all your ammo through the magazine to make sure they fit in the magazine.
Just had a group of hunters here from Idaho who came with two 375 rifles. One guy hand loaded the ammo but when we were at the lodge's shooting range they realise the bullets are too long to fit inside their magazines (on both rifles). That reduced two fine 375 rifles to single shot rifles.
Luckily I had plenty 375 factory ammo in stock so the clients just used my ammo.
Anyhow welcome to the forum and if you have any questions feel free to ask.
Sincerely
Hans de Klerk