Affects of bullet grain wt.

[Richard S.]

How much would bullet grain weight affect impact point. If you are zero at 100 yds with 150 grain bullet, what would impact be with 180 grain bullet?

[Artos]

It’s more with barrel harmonics than weight...think of barrel whip shooting the same bullet with & without a suppressor. Competitive rimfire shooters have weighted / threaded tuners on the muzzle to tighten groups screwing in & out for the same rounds.

[sendit]

It’s hard to say without shooting a particular load against another. The poi can be the same or it could be 3” left and an inch high. You really can say for certain. Barrel harmonics play a key role in this.

[texasdeerhunter]

I think barrel harmonics is bull****. Physics say that a bullet weight of 150 grains shot with the same amount of force (gun powder) will not fly as far or as flat as a bullet that has a higher weight (180 grains).

[PondPopper]

I think barrel harmonics is bull****. Physics say that a bullet weight of 150 grains shot with the same amount of force (gun powder) will not fly as far or as flat as a bullet that has a higher weight (180 grains).

Yes.. Heavier will have more drop the the lighter even if the muzzle velocity is the same.. Its called gravity and the difference in the two flight paths widens the further they travel. I've never heard harmonics having anything to do with bullet drop.. Accuracy yes but not bullet drop. But heavier bullets will cause more barrel whip. This is one of the main reasons the TC Prohunters are notorious for not being accurate especially in the heavier calibers.. The barrels are to long.. The harmonics are all over the place. Its a design flaw. Cut 3 inches off, re-crown, and its a completely different shooter....

[Artos]

I’ve clearly shot / reloaded / printed a lot more pills on paper than some here...claiming absolutes is foolish but please carry on.

[sendit]

I think barrel harmonics is bull****. Physics say that a bullet weight of 150 grains shot with the same amount of force (gun powder) will not fly as far or as flat as a bullet that has a higher weight (180 grains).

Yes.. Heavier will have more drop the the lighter even if the muzzle velocity is the same.. Its called gravity and the difference in the two flight paths widens the further they travel. I've never heard harmonics having anything to do with bullet drop.. Accuracy yes but not bullet drop. But heavier bullets will cause more barrel whip. This is one of the main reasons the TC Prohunters are notorious for not being accurate especially in the heavier calibers.. The barrels are to long.. The harmonics are all over the place. Its a design flaw. Cut 3 inches off, re-crown, and its a completely different shooter....

These two comments contradict each other and make my head hurt.

As I read the op’s post I take as he is asking whether or not the two different loads (bullet weight)will have the same impact at 100 yards. The answer is not known until the shots are actually taken and compared. They may very well shoot to the same impact but at the same time may not. It’s not about drop or how far the bullet “flies”. At 100 yards the point of impact is affected where the muzzle is pointing when the bullets exits the muzzle, which boils down to barrel harmonics.

[PondPopper]

I’ve clearly shot / reloaded / printed a lot more pills on paper than some here...claiming absolutes is foolish but please carry on.

Is this an absolute??

[Old Bald Guy]

As I read the op’s post I take as he is asking whether or not the two different loads (bullet weight)will have the same impact at 100 yards. The answer is not known until the shots are actually taken and compared. They may very well shoot to the same impact but at the same time may not. It’s not about drop or how far the bullet “flies”. At 100 yards the point of impact is affected where the muzzle is pointing when the bullets exits the muzzle, which boils down to barrel harmonics.

100% correct.

[PondPopper]

100% correct.

Either mass weight and gravity mean something or they do not.. Which is it?
If you are agreeing that its 100% harmonics then your are dead wrong also..

[tdwinklr]

just read ballistic charts for each bullet from the manufacturer ... they've shot many more than we have and are using test barrels that do not waver much at all.
Bullet weight is what it is, don't complicate it.

[junkmanhunter]

My inexperience will tell you, that when I was younger and didnt pay attention to ammo brand or bullet weight and would buy and shoot whatever, "because it didn't matter ", so I thought.

I can remember shooting my 270 with 130 gr and driving tracks with it. Bought a different manufacturers ammo, bullet type and a 150 gr bullet. It was a couple inches low and left.

Being a 20 yr young experienced know it all, I argued with dumb people about it and tried to convince them my scope had been bumped so I zeroed my rifle back in. Yep, you guessed it, next week when I shot a 130 gr, it was high right. I finally decided to listen to an old dumb guy and shot both rounds on the same day. That was a huge learning point in my life.

Ammo manufacturers, bullet type and bullet weight will all affect point of impact.

My inexperience says minimum an inch at 100 yds. Only sure way to know is to take both rounds with you and go shoot 3 of one, clean gun then shoot 3 of other and you'll have the answer. Report back and let us know, please.

If it wasn't raining, I'd do it this morning and post up target.


Sent from my SM-N950U using Tapatalk

[canny]

Too many variables to have an absolute. Assuming all things equal at 150 yds there will be a difference, but a small one at that. However that rarely happens. As Artos said, barrel harmonics plays a big role. The vibrations created in a barrel as a bullet travels down need to have little difference for rounds to contact the same place. A heavier pill vs a lighter pill will change that based on pressures and bearing surface of the bullet. Don’t think that barrel harmonics have a big impact. Zero your rifle with the rest under the recoil lug, then shoot it with your barrel sitting on the rest. That will change the harmonics greatly and you will normally see a shift in impact point.


Sent from my iPhone using Tapatalk

[JhuntsAlot]

I like this website for this topic. Doesnt give a lot of bullet sizes, but has what I need.

http://www.shooterscalculator.com/

J

[HTOWN]

The last time I did that the 180s dropped about a inch.
Then I put in some 200 grain and those shot high.
Never really know until you put it on paper.