Interesting... I'll have to experiment with a heavier bullet soon and see the results. For right now, I'm very happy with the consistency of this load. They grouped roughly 1.5" at 110yd, and probably would be a tiny bit better with optics. Not sure if it's the propellant or the cumulative 5+ hours of work it took me to reload 20 rounds. I felt like I was pulling out the dial calipers every 10 seconds...
Yeah? Wait till you have a micrometer. If your groups are an inch and a half at 110 yards your doing something right. This is not a race and you have time to go at a pace you are comfortable with. You might just end up like some of us who really enjoy this stuff. Sounds like you have a good start.
Seems like you are well on your way and doing things right. You will find that operating the press at a consistent speed will give you more consistent results when it comes to the COL of each round.
Don't worry about where different loads hit as long as they group well. I have a 30-30 that will shoot Hornady 160gr. gummy points a full 9" higher at a 100yds than my 150 grn loads even though the velocities are very close. They both will group very well.
On a side note, it was interesting to feel the increase in recoil throughout the process. 52 grains was “meh, not bad” while 54 grains was “ok, you have my attention now.”
Barrel time, harmonics, recoil, shotstart pressure, number of rounds in the magazine, neck tension, nose shape, bullet weight, rifling configuration or twist, the way you hold your tongue at the corner of your mouth, primer, temperature, altitude, and barometric pressure all contribute to point of impact moving. Find a load that shoots best with the desired projectile, and stick with it.
I have developed a load in the past that walked the hits diagonally lower left to upper right as powder charge was increased. Sometimes you just get surprised. Internal ballistics is a very complicated science, and it's part luck combined with the black arts.
42gr. of H4198 and a 300gr. hornady XTPHP and life is good,,,,,,,,,,,,,,,