I'm searching for a starting load for a 300 Win Mag and wondered about others' experience using the 180g Hornady Interbond, particularly at close ranges. Will it hold together on game at around 3,000 fps?

Jaywalker

Try 75.5grs. RE22 with the 180 IBs and WLRM primers.

They'll hold together at any speed you want to push them.

BTW, This load with 180 Hornady SPs produce moa groups in a friends Sako. Don't see the Interbond doing any worse. Jay

the 300 mag will cause alot more meat loss at close ranges with accubonds- provided you can get them to be accurate. both my friend and i cant get any accuracy out of accubonds. i recomend partitions- they wont do as much meat damage up close and will hold together, shoot well and give you consistant one shot kills

Accubonds??

He was asking about interbonds.

True, I was asking about Interbonds. I think Accubonds will probably hold up, as it's my impression that they expand less than the Interbonds. Interbonds work fine at 30-06 velocities, so I wondered about IB at higher velocities.

Jaywalker

Here's a good article on them.

http://hornady.primediaoutdoors.com/HDstory12.html

And another article.

http://hornady.primediaoutdoors.com/HDstory10.html

I did a lot of expansion tests on the interbond over the last 3-4 years. I posted the results here and on other websites.

Here's a 180 IB that I fired from my 300 WSM, into water filled milk jugs.



I tested the 180 IB alongside of the 180 accu-bond. Nearly the at same velocity, 100 yds.

This pic shows the comparison between the AB and the IB. It can be seen that the AB looses a lot more weight, AND expands a lot less. This has been born out in field experience on various game animals.



Penetration was 3 jugs,(bullet found in 3rd jug), for the IB and 4 jugs for the AB Here's the set-up.

Thanks, grizz, that's what I was looking for. I wonder how I missed it in my search before posting...

What was your muzzle velocity?

Jaywalker

Excellent job Grizz--In some ways I like what I see in the interbond but wonder about penetration a little. That good old fashion $.10 cent corelock didn't do to badly either!!

JW, I was at 3059 for the IB and real close to that for the AB. That was with 68.5 gr. of R-19, out of my Browning a-bolt stalker.

Kraky, those core-locts were at least 25 years old and RN configuration at that! They were also the most uniform mushroom.



They also went into the third jug, to be found there, BUT the first jug showed less extreme disintegreation, while the second was split more than with either the IB or AB. So it seems they open slower without the plastic tip to enitiate expansion.

quote:

Originally posted by kraky:
Excellent job Grizz--In some ways I like what I see in the interbond but wonder about penetration a little. That good old fashion $.10 cent corelock didn't do to badly either!!

But Don, It's a Roundnose. The BC just isn't there. Jay

quote:

Jay Gorski: But Don, It's a Roundnose. The BC just isn't there.

Sure, but those old CoreLoks had excellent jackets. The roundnose CoreLoks still do, but the spitzers' jackets are thinner now. I wouldn't use it either, but it makes a nice comparison.

Jaywalker

I had good luck with the 165 IB at 3200 fps in my 300. They are not as tough as a Barnes by any means, but I have gotten complete pass throughs on several deer and elk (shot through the lungs). They are not tough enough to shoot something in the shoulders at high velocity. They dropped the animals right away but I didn't get an exit wound. The 180 should be tougher and pentrate further than tha 165's I used.

Sure looks like Hornady's just copied the Speer Hot Core technology with the Interbond.

quote:

Originally posted by Ricochet:
Sure looks like Hornady's just copied the Speer Hot Core technology with the Interbond.

Nope, the hot core is simply a molten lead poured into a bare cup, then formed to it's final shape. Little or no bonding occurs between the hot lead and the jacket cup. The theory is that the molten lead forms better that a chunk of lead wire that forms most cup and core bullets.

quote:

grizz: The theory is that the molten lead forms better that a chunk of lead wire that forms most cup and core bullets.

Very true. Apparently, it's the materials slathered on the lead wire to slide it into the cup easily that allows it to break away from the jacket when it's needed. No surprise, if you think about it.

Jaywalker

Essentially, Emary and his staff have taken the SST design and added a thicker jacket to it, as well as having bonded the lead core and the jacket together. This entails pickling and cleaning the jacket, says Emary, then applying flux and essentially melting the core and jacket together. Initially, 130-grain .270, 139-and 154-grain 7mm, and 150-and 165-grain .30-caliber Interbond bullets will be available as handloading components, with loaded ammunition soon to follow.

Interbonds are available in the following calibers and weights.
.277 130
.284 139 and 154
.308 150, 165, and 180
.338 225
.458 500 RN

Loaded ammo is;
.270 win 130 light mag
7mm rem mag 139, 154
7mm rem mag 139 heavy mag, moly
7mm weatherby mag 154
30-06 150,165
300 win mag 150, 165
300 weatherby mag 150
30-06 150, 165 light mag
They are in the process of making an 8 mm 200 grainer, should be usefull for the new 325 WSM.


https://www.hornady.com/shop/?page=shop/search2&keyword=interbond

If they'd just bring one out in 120g .264, I'd have everything I ever needed. Yeah, sure...

Jaywalker