I have a question about ballistics.

The 150 will shoot flatter at all distances but I’d shoot a 3 shot group with the 150 and 180 before dialing the scope in. Your rifle may favor one over the other.

You should be able to find a ballistics chart for both.

There is no way to tell how your rifle/barrel will shoot different bullets (projectiles). At 100 yards, velocity difference between the 2 cartridges will not likely have a significant influence (there should be similar velocity loss at 100 yards, at least not enough to affect bullet drop), assuming they are both factory ammo loaded to achieve similar speed. However, barrel twist rate, barrel harmonics, etc. can result in a significant or minor shift in point of impact (POI). Also, if you are not cleaning the barrel between ammo types, the residual copper/fouling can affect the 1st or 2nd shot with the new ammo until the barrel develops the "new" fouling with the new projectile.

TLDR: There is no way to tell until you shoot both.

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If the 2 rounds had the same muzzle velocity the lighter bullet would be higher at a given distance generally.

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Bullet weight has no affect on drop......like in science class.....drop a bowling ball and a rubber playground ball of the same size, and they hit the ground at the same time.

At equal muzzle velocities (MV's) in the same atmospheric conditions, the only variable on bullet drop is ballistics coefficient (BC). In general terms, most heavier bullets have higher BC's due to their longer, more aerodynamic shape, and they therefore will have less drop than a lighter projectile with a lower BC since they maintain speed better than a bullet with lower BC.

So, at equal muzzle velocities, the heavier bullet will generally have a higher POI at distance if it has a higher BC. The issue is that most factory-loaded cartridges with heavier projectiles will have a lower muzzle velocity than a lighter projectile, resulting in a lower POI for the heavy projectile. But this is not due to weight, rather due to lower MV.

Remington no longer has their ballistic calculator on the website.

https://www.federalpremium.com/ballistics-calculator

You should be able to punch in some numbers on this calculator and see the results.
1" high with that caliber is probably around zero at 170-180 yards.

REM Ballistics Chart

I don't have an answer other than I shoot a .270 and had something similar happen.

I usually shoot 150g rounds thinking I'm not shooting that far, lets send a heavier bullet. I messed up and grabbed a box of 130g rounds a year or 2 ago.

I worried about it so I went to target shoot the 130's and find out. They hit dead on at 100 yards.

I put a 150g in, still dead on.

Didn't seem to matter.

I'm sure if I backed out to 300+ yards there may be a difference, but my main stand has 2 shooting lanes. One is 100 yards, and the other is 150 yards.

Yea I had I backwards.

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Core-Lokts

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They leave a short blood trail a foot wide in my experience.

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Newton's universal law of gravity

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I didn't realize my general question would turn into this! It is entertaining tho