Hello. I've just started re loading and am a little lost. I don't think this belongs in the reloading section though. I have a Sendero ll 300 RUM. Loaded to book. 3.600 OAL, 94 gr Retumbo Powder, 200 gr Accubond, Fed 215 Primers, Rem brass full length resized. Brass extensivley preped. De burred, primber pocket uniformed, weighed, etc.. I started with 94 gr, not sure why, but did. Book says 95 is max and 91 was most accurate load tested. Here's where I'm lost. With that caliber and bullet, does it take a certain distance for that bullet to stabilize, or is there just simply fine tuning to be had with bullet seating and powder? Here's why. I chronoed the rounds, got temp, elevation, humidity, etc.. all the works. Went to several ballistic calculators and printed out dope charts. Each bullistic calculator was about the same. I went to the range. Wanted a zero at 275 yards. Said I should be high 1.0 inches at 50 yards. So, I got on paper, got to exactly 1.0 inches high at 50. Shot 2 rounds. Punched paper in exactly the same hole. Thought, good start. Went to 100 yards. Dope chart said should be 2.5 inches high. I put 2 rounds touching right at about 2.25 inches. Roughly, hard to measure 200 gr bullet hole when talking half inch size holes. Ha ha. Anyway, I was like, wow, first time reloading and everything is amazing. Then, go to 300 yards. Chart said I should be 1.5 inches low at 300 yards. I was 3.5 inches HIGH. I shot 1 round, let barrel cool for about 5 min. Shot another, let cool. Shot another again. 3 total. All rounds could be covered with a copenhagen lid I would say. So, now I was wondering if I fouled my barrel up with a little copper. I spent the next hour running patch after patch of Tetra gun until there was no more blue to be seen. Went straight to 300 yards, same thing. 3.5 or so inches high. Went to 50 yards, 1 inch high. Whats the deal??? Why am I shooting high??? Is that bullet not stabilized yet, or does that round just not work out of that rifle and I need to do some fine tuning? I haven't tried 4 or 500 yards yet. I checked scope mount and everything felt tight as can be. Shooting a Sightron Slll 6-24X50. Can't remember the scope mount. Thanks for the help.