Nossler Accubonds vs Hornady Interbond

[James 1]

Looking for a bullet for my 7mm Rem Mag. Will be using IMR 4831. I checked the specs on the Nossler 160 gr Accubond loads: 59 to 63 grains 2858 to 3008ft/sec
Hornady 154gr interbond is 54.8-59.1gr 2600 to2800ft/sec.
I thought these bullets were pretty pretty close. Why is there so much more velocity in the Accubonds? Both rifle barrels used were 24"
If you also look at the specs Nossler calls out a starting load of 59 gr and that is the ending load for the Hornady???

[elkhunter11]

Are you taking both loads from the same source? If both loads were not obtained from the same source, and developed in the same rifle, a comparison doesn't mean a lot.

[BackPackHunter]

I'll take the Accubond over anything else anyday
But I'm going to try the LR Accubonds as soon as I run out of the normals
Cheeper + better BC , win win

[James 1]

Originally Posted by elkhunter11

Are you taking both loads from the same source? If both loads were not obtained from the same source, and developed in the same rifle, a comparison doesn't mean a lot.

Why such big differences in max powder ratings. With bullets that aren't that different, or maybe they are?

[Pioneer2]

Don't assume IMR 4831 will be the best in any given rifle.My son's 7mag preferred IMR 4350 and the 160gr Accubond.Harold

[Dick284]

I've had a couple 7's that preferred H1000, and 160gr. AB's

[elkhunter11]

Why such big differences in max powder ratings. With bullets that aren't that different, or maybe they are?

You didn't answer my question about the sources of the two loads. If the sources are different, and they used different guns, different lots of components, and a different means of calculating pressure, the differences in loads and velocities are quite understandable.

[James 1]

Not sure if this is a rhetorical question or not, but hear goes.

The 2 sources are hornady’s reloading manual 9th Ed. for the 154gr interbond and nosslers 160 accubond on the internet. All of course for the 7mm Rem Mag.
#1 Hornady is using a 24” Remington 700.
Nossler is using a 24” Wiseman Barrel.
The means of calculating pressure should come out with the same results?
Nossler is getting mostly 300ft/sec out of their accubond 160's and hornady is getting 2800/2900 out of theirs. They are also grouping a lot of bullets together as in the interbond, Interlock and interlock SP so maybe they are just being on the conservative side.

[elkhunter11]

Exactly, two different sources, two different barrels, two different lots of components, and quite possibly two different instruments for measuring chamber pressures. As well, the Hornady data may simply be very conservative.

[James 1]

Thanks I appreciate your input. As I think I may have told you before. I am finding this science of reloading very interesting. I have a 7mm Rem Mag and am looking for bullets and powder. I also did get out and do some shooting on Sunday unfortunately I had to use store bought ammunition.
Can't wait to get started reloading and trying out some of my own!!

[WABBIT]

I had a Rem 700 in 7mm RM, that loved IMR4831, but the max was 60gr with 160 Accubonds.
I got definite pressure indicators if I went over that. It taught me a very important lesson regarding starting low and working your way up.
I used a starting load of 61 grns, the mid range in the Nosler book (I thought I would save a few bullets and some powder), the first 2 rounds showed pressure signs, the third blew the primer and scared the cwap out of me.
That lesson will always be remembered, you never know when you will run into the rifle that is a little tighter than the norm.