Hornady Interbonds?

T

trimble

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Super GunNutz
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Hi all,
I just purchased a box of Hornady Interbonds in 7mm 139 GR with intention to use them in my 7mm-08 Savage. I heard that they differ in weight, so I weighted all of them. This is what I found out by measuring 100 bullets:
138.5 GR – 14 bullets
139 GR – 48 bullets
139.5 GR – 28 bullets
140 GR – 10 bullets
All of them were measured with RCBS 5-0-5 scale with 0.25 GR rounded to closest weight. Discrepancy was around 2 GR top to bottom.
My questions to all of you are:
Is this common with Interbonds?
Is accuracy influenced by bullet weight?
Does Hornady know about this?
Thanks
 
It's not target ammo, but I can put 5 shots into an inch, (but no better), with the 165 gr interbonds shooting out of my 300WSM Sako A7. Plenty good for hunting. Haven't weighed them.
 
There are several things that will contribute to or take away from accuracy.

Bench rest shooters, are very concerned with jacket concentricity. Or at least they used to be. When manufacturers started using Juenke guages to measure their jackets, they retooled to get their bullet jackets far more consistent all over.

Variations in jacket thickness will cause bullets to increase their spriral diameters as distance increases. Most bullet makers jackets, now rival the old J4 custom jackets from 15 years ago.

Barrel variations, alignment of chamber to bore and bolt face etc will also make a difference.

The list goes on and on.

If you're target shooting in a serious manner, 1 inch groups aren't acceptable.

If you're shooting an off the shelf rifle, that's not a bad group at all.

If you're shooting a custom barreled rifle on a trued action, with a tight chamber, that's not an acceptable group.

That's when it starts to get very expensive.
 
If you want better consistancy you will have to do like I have done. Spend a thousand plus dollars on bullet swaging equipment , weight sort your jackets and cores before assembly and then go to town! This will mean that your bullets will weigh the same but there is still much to do for accuracy. Once your money is where your mouth is you will soon realise that the "batch lot" consistany offered by the big manufactureers is pretty darn good .If the bullets that you have chosen shoot well from your rifle , just enjoy the fruits of someone elses labour and make noise and bug holes on paper. If not the options are only limited by your own patience ,cash on hand and your own sanity. Just my own opinion. YMMV!
 
So now you have them seperated, shoot a number of groups with the same weight bullets, then a number of groups with .5gn lighter, a number of 1gn heavier & see if you can see the diff. My guess is not, unless your Sav shoots a lot better than I'd guess it does.
 
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