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Started By
Message
I have a question about ballistics.
Posted on 1/13/26 at 3:12 pm
Posted on 1/13/26 at 3:12 pm
I'm shooting a 300wsm 180g core lokt, 1" high at 100 yards. I'm switching to a 150g core lokt. The question is how much difference can I expect between the 2 without sighting the rifle in between the 2 rounds. Will the 150g be lower at the same distance? Of coarse i will shoot on paper asap, I'm just wondering what the opinion of the board will be.
This post was edited on 1/13/26 at 3:16 pm
12
Posted on 1/13/26 at 3:21 pm to animalcracker
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.
Posted on 1/13/26 at 3:22 pm to animalcracker
quote:
Will the 150g be lower at the same distance?
Generally a lighter round is faster so it would generally be higher than a heavier bullet in the same cartridge. Then with that said it could still be lower.
There are way to many variables to give you a definitive answer.
It possible they could have the same POI at 100yds, its possible the POI could be 3" off in any direction at 100yds.
This post was edited on 1/13/26 at 4:40 pm
Posted on 1/13/26 at 3:24 pm to animalcracker
You should be able to find a ballistics chart for both.
Posted on 1/13/26 at 3:25 pm to animalcracker
quote:
1" high at 100 yards
I never understood this theory. Just zero it in at 150 yards.
Posted on 1/13/26 at 3:27 pm to animalcracker
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.
TLDR: There is no way to tell until you shoot both.
Posted on 1/13/26 at 3:32 pm to Shexter
quote:
I never understood this theory. Just zero it in at 150 yards.
Its a maximum point blank range zero. It makes sense, but nobody ever does it the correct way. They just choose an arbitrary range and roll it, which works down here because we normally dont shoot far. Some ballistic programs will calculate this for you.
Posted on 1/13/26 at 3:38 pm to civiltiger07
quote:
If the 2 rounds had the same muzzle velocity the lighter bullet would be higher at a given distance generally.
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.
Posted on 1/13/26 at 3:41 pm to animalcracker
It should shoot higher than an inch high being it's lighter and faster.
Posted on 1/13/26 at 3:42 pm to animalcracker
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.
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.
Posted on 1/13/26 at 3:46 pm to animalcracker
You can look up a ballistics chart for each grain and see what the difference is.
Posted on 1/13/26 at 3:49 pm to animalcracker
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.
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.
Posted on 1/13/26 at 3:51 pm to animalcracker
Core-Lokts…. Woof
Posted on 1/13/26 at 3:52 pm to TIGERRVER
Yea I had I backwards.
This post was edited on 1/13/26 at 4:11 pm
Posted on 1/13/26 at 3:57 pm to TIGERRVER
This. Bullet weight, muzzle velocity doesn’t matter. The barrel’s harmonics dictate change in POI. Shooting even the same bullet at a higher velocity won’t necessarily make it impact higher. It’s all about the individual barrel, pressure, and harmonics… and BC.
This post was edited on 1/13/26 at 4:12 pm
Posted on 1/13/26 at 4:10 pm to TexasHand
quote:They leave a short blood trail a foot wide in my experience.
Core-Lokts
Posted on 1/13/26 at 4:12 pm to civiltiger07
quote:
quote:
Bullet weight has no affect on drop
Really none! Well gosh dang.
quote:
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.
You should go back and take that class again.
Yeah, maybe you should take science class again. Every object on earth accelerates when dropped at 9.81 m/s^2 or 32.2 ft/sec^2....bowling ball, playground ball, army tank, aircraft carrier, bag of feathers. The only thing that would reduce an object's time of fall (acceleration of fall) is air resistance (drag). So, if you drop two objects from a bridge with the same dimensions (say a 12 inch sphere), one weighs 1 lb., and the other weighs 100 lbs, they hit the ground at the same exact time.
I'd like to hear your explanation to disprove Newton's universal law of gravity.
This post was edited on 1/13/26 at 4:13 pm
Posted on 1/13/26 at 4:17 pm to TIGERRVER
quote:I didn't realize my general question would turn into this! It is entertaining tho
Newton's universal law of gravity
Posted on 1/13/26 at 4:18 pm to TIGERRVER
Thanks chief I realized where I was wrong.
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