YOU SHOULD BE FINE ..... THIS IS ONLY A start of some things to read on. alot of us on this website have been shooting for years and love the art and science of this , we have been trained , or have years in the field . THIS IS just a little rough of how you could miss just with what you told in post.
Like the other before .. I would zero rifle before I go out .where I was trained if you clean a barrel unless that barrel has about 10,000 rounds threw it its not worn down you will see change at around 6,000 rounds ... if so and you have shot 10,000 rounds or more I would change barrel. If you cant or fund that and have already clean need to rezero it and if cleaner has sat in it for a day or 2 and you have cleaned .. zero again..OTHER NOTES
-Sudden drop in temp more than 20-30 degrees that will change shot a few inches ok rise and fall based on temp rise and fall ever 10 degrees.
-Buck jerking flinching
-Pulmonary pause heart beats .
-Other things that will effect your shot in another sense is external ballistics every plus or minus 10 degrees in temp If i remember right will drop or rise your POI about 1 inch. Super long range which you wont have to worry about things like earth spin and all that . simple and stupid , point shoot
IF YOU HAVE A GUIDE HUNTING NEVER READ THIS
Super Long range Shooting ... Wanting to Hit first time every time.
Extreme effects
Coriolis drift- Summuary is deals with the sping of the earth mainly to a North south shooting situation . where talking major flight time 1700+ yards or so will effect left and right strike of round .
Eötvös effect - Super Long range shooting as well relating to earth rotation as well in a east to west shooting situation dealing with long flight time as well being that your bullet will seem to strike lower or higher based on direction of shot and earth spin and what direction you are shooting at .
JUST A SUMMARY .
-that load I would not make a wind call till 400 yards good guide will keep ya close you hit walk away happy .YOU WILL be shooting at less that 400 yrd with that load ...That round should shoot like a laser beam unless your in a hurricane and 25 mph hour winds ... I DONT LIKE TO SHOOT so close ... hah. Elevated positon of a crazy amount will do it too but still if less than what I would guess of maybe 300 yrd wont matter unless shooting straight down or something crazy . YOUR GUIDE KEEPS IT simple and stupid . YOU WILL BE HAPPY AT END OF THE DAY . IF YOU WANT TO SHOOT LIKE THAT .. near Yellowstone .. HAH look me up ... thats if you want to just up a bit .. shoot around .338 and start glassing other mountains , scouting water holes, and streams, looking for game trails. THATS HUNTING. no feed . no guide . Oh yea and if your shooting at that range ... that you are .. me a man mil your target out dont use a range finder and do a 2 point resection and find your way home.
SAD THING IS ..... THIS WOULD ONLY BE THE START FOR YOU.
HOG