Affects of bullet grain wt.

[okrattler]

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.

This is what I was going to say. Every bullet will shoot different out of different guns so you can't really go by past experiences with a different rifle. Even different bullet types of the same weight will shoot different. May not be enough to tell a difference shooting an animal but on paper you can tell.

[rjtkdplus]

For cryin out loud! Don’t y’all know this is a BOWhunting forum?

[McClain]

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....

Will someone please take the time to explain to these two the factors involved in the answer to the OP’s question as asked? I am not going to do it by phone. Don’t thumb type that well.

[TxAg]

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..

Gravity acts the same for a bullet weighing 100 gr as it does for a bullet weighing 200 gr.

[Briar Friar]

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.

I recently saw this with a 16.5” 1-9 twist .223 when I was sighting in a scope...using 45 gr JHP Varmint loads. It was a shotgun pattern. I changed to Federal 55 gr...the groups tightened immediately and sighted scope. After researching some ...it seems the 45 JHPs are super fast and need a long barrel with a slower twist...say 1-14. I ran out of 45 JHP playing hokey pokey with my scope and havent been able to test on paper.

I shortened my barrel on my 308. It went from loving 168 gr Federal Game kings to hating same round. I found it changed preferences to 150 gr CoreLokt.

Proof is on the paper.

Good luck MrRichard.

[Mission408]

When i switch from a 400 grain arrows to a 460 grain arrows my groups were about 6" low. So by my math your only increasing bullet weight 30 grains. Or half what i did. I went up 60 and lost 6" so i would put you 3" low.

[TxAg]

when i switch from a 400 grain arrows to a 460 grain arrows my groups were about 6" low. So by my math your only increasing bullet weight 30 grains. Or half what i did. I went up 60 and lost 6" so i would put you 3" low.

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[Mission408]

Lol no hahaha! Perfect pic!

[TxAg]

Lol no hahaha! Perfect pic!

Phew! I was worried where this thread was headed.

[canny]

Affects of bullet grain wt.

When i switch from a 400 grain arrows to a 460 grain arrows my groups were about 6" low. So by my math your only increasing bullet weight 30 grains. Or half what i did. I went up 60 and lost 6" so i would put you 3" low.

lol!

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[cva34]

Just my 2c Most of my factory dealin's just changing brand with same Grain weight /profile will change point of impact...So expect same with Gr weight change.

maybe Up down R or L and sometimes (no change ) (Choot em and see)

And the reason WHY? I do not Know! (maybe one of the members hit on answer above)

[Richard S.]

Wow... A lot of information and wasn't expecting that. Never really thought or know much about Harmonics... The reason I asked this question is because of the difficulty in finding ammo these days was wondering how different grain weights might affect POI for hunting purposes so if my rifle is sighted with 130 or say 150 grain and I can only find 180 grain could I still hunt with it.. Seems like the general conclusion is that I probably could but best to shoot them before hand to confirm.
Thanks guys for all the information.

[Anteloper]

The heavier bullet usually isnt moving as fast which is why it generally hits lower. The harmonics wouldnt factor in as much in most cases(assuming youre shooting out of the same barrel). You never know until you shoot it.

[wdtorque]

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

LOL! Killing me 🥸
“Please carry on” [emoji28][emoji23][emoji1787]


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[Drycreek3189]

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

The phrase “Never say never” comes to mind.