I was just over in Bonanza yesterday on my first Sage Rat outing yesterday.... today I just received my order for 750 of the Speer TNT 70 grains in 6mm...
I've used this bullet before and it is superbly accurate.. and it also pretty fragile.. so it would definitely fit the needs of what you are trying to do...
Powder Valley has them in the 750 bulk packaging....
