Interesting thread. I dont like copper only bullets because you have to use longer bullets to get the same weight and those long bullets dont stabilize well in my 7mm RemMag. However, there is one Nosler I really dont like on deer and that is Nosler/Winchester joint venture balistic tip. (I dont know if this is the same bullet as Nosler balistic tip) Anyway I did use this bullet on reindeer once and it made a hole in the entrance with the size of my head, but it didnt penetrate trough the shoulderblade of the deer, it just exploded on the deers skin. I had to shoot it in the neck at 3 meter range to finish it off and the f.... bullet didnt penetrate the neckspine this time eigter, so I had to take another to the head. This time the deer died, but the bullet just eksploded in the deers head and didnt get trough... And this last shot was at a 2 feet range!!! That bullet must be constructed for varmintshooting?
THAT is part of the problem...
The BT's (both versions) are constructed for shots out over 300 feet (100 yards) and is at its best out at 150-300 yards (both the CT and plain Nosler Ballistic Tips). They are DESIGNED for shooting animals at long range where the velocity is tapering off so that they will open effectively at slower speeds.
The fact that you were shooting them at TWO feet is the worst possible scenario for that bullet....like throwing gasoline on a fire....especially if you were shooting that 7mm Mag!
I have killed multiple deer and antelope stone dead like they were hit by lighting out at 200 yards with complete rib cage pass throughs and fist sized exit wounds.
The problem with the ballistic tips is when they show up closer than the 150 yards you were expecting and you are shooting a high velocity cartridge and shoot the shoulder blade not the lungs....that is a worst/worst/worst case sceario for a Nosler or Combined Technology BT bullet.
I quit using them for most hunting because I might be in a swamp shooting at bow ranges at one point and a shooting across a food plot at 200+ yards at another point in the day and need a bullet that can handle both situations.
The BT's are fine if you understand what they were DESIGNED to do and use them accourdingly. My rules would be
1) Expect shots at 100 yards or more
2) Standard velocity cartridges not high speed sizzlers unless I was expecting them to not typically be inside 150 yards
3) Never shoot the shoulder blade. Broadside or quartering away lung shots...pretend you are bow hunting. Bow hunters never try and go through the shoulder blade (at least not good ones) and wait for a good angle.
If I KNEW that most of my shots were likely to be long I would use a BT again, but the Partition is a better "all range" bullet.
The biggest issue with the BT's is people that try and use a sledgehammer to drive a trim nail (shooting them through boomer, high speed cartridges at inside 100 yards and shooting the shoulder). They are using the wrong tool for the job.
If you look at the Nosler web site they will tell you that the bullet was designed to be used at less than 3200 FPS and you will see the pics of them at various velocities. They are at there best down around 1900-2200 FPS
http://www.nosler.com/Bullets/Ballistic-Tip.aspx How fast do you think your bullet was going at 2 feet???? Or even 11 feet (3 meters)??? (Especially if it was that 7mm Mag) At what range was the first shot???
I don't use them much anymore because of the limited (longish) range they were designed for and in most of my hunting I might get the animal at 30-75 yards or I might get it at 200 yards so I need a bullet that works well in both situations.
But if I knew there was 90 percent plus chance that my animal would be 150-300 yards and needed long range accuracy and minimal bullet drop/wind drift I would use it again in a heart beat.
Problem is most of my hunting isn't that situation.