If you switch to copper and have a great rest and perfect shot and the animal walks away don't assume you missed. All bullets have their shortcomings in the wrong situation. As for accuracy never found them to be more or less accurate than any other bullet, but I load my own.
The argument that was presented to me was that because a copper bullet retains most of its weight after impact you can use a lighter bullet and thus get more velocity. A 180g copper/lead projectile that sheds 15% will penetrate like a 150g (talking .308 dia). Therefore you can get the penetration of a 180g and the velocity of a 150g with a copper bullet. A buddy of mine uses special cavity back ones for his 7.62 and has shown excellent expansion down to 1300fps. He also took a big MD with a quartering to shot and extracted the bullet just in front of the tail with almost full weight retention. They are performers but I hung my hat on Accubonds and Ballistic Tips so I have no need to develop another load at this point.
People should not be assuming they missed in any situation. If I see someone shoot at an animal I better see some effort to look. Copper or lead, every crew has stories of a moose that ate up 4 bullets through the boiler room that didnt respond at all until dropping dead a minute later.
My thoughts on the all coppers. I've had great success with the 168 tsx's out of my 30-06. Last couple years was shooting 150gr nosler e-tips from my 280 with good results.
The reasoning behind switching is:
1. Sick of following bears into the thickest bush in the know galaxy, therefore would like the shoulder shot.
2. Concerned with shooting moose beside water (I hunt lakes and swamps) and have only had to float one, but if I could anchor a moose on the shore it would be best.
3. Dont want the family eating lead.
4.The bullet often ends up hitting bone anyways (quartering to/away, or bad shot) and the coppers have the reputation of shocking the meat less.
I have been using them almost exclusively and they have performed flawlessly. The general rule is to go with a lighter bullet and faster muzzle velocity. You typically want to impact an animal at or above 2000 fps to ensure proper performance with the bullet, so you need to keep that in mind when shooting long distances if that is what you intend. The bullet will hold together whereas conventional cup and core will usually separate. A 165 gr TSX will perform like a 200 gr conventional or even NP as those bullets shed weight almost immediately. I used a 30-06 168gr TSX on a griz and it hammered it hard! Many nay-sayers claim they 'don't open' but they most certainly do when they are employed within their performance envelope.
Regards,
Ltbullken
Freelance Wildlife Population Manager
Animals - If you can't eat 'em, wear 'em!