Originally Posted by JonM
You will probably have accuracy issues. Look for keyholing as in the bullet going in the paper at odd angles. Holes will be odd shaped sometimes ripping the paper. Its also possible they may disintegrate leaving the muzzle at rifle velocity.
There are some accuracy issues, so as long as the twist rate of your
rifle barrel is in the range of the bullet and you are shooting the correct
caliber bullet for that barrel. You will be safe. You do have to find
proper load data or at least starting data for the round and work up
an accurate load from there. Hotter is not better.
I load .357 hunting handgun bullets in my 12 year olds .35 Remington
(Marlin 336C) Lever Rifle. I also use Hodgdon's SR4759 powder for an
excellent reduced recoil round for him. They are accurate and he got
his first buck (button) last year with it, he is ready to hit the woods
again this fall.