Yes, they are the power shocks. I use them in my 30/30 as well, not much more than $10 a box. They also kill deer in 30/30.
When I first got the 243 prior to reloading, I used the power shocks to zero the scope. I then took them on a hog hunt, they worked on 2 little piggies that never went wee, wee, wee all the way home. I now reload the Sierra 85gr BTHP as my deer/hog load for this rifle. Wicked accurate.