As a reloader, when I load it is rifle specific, not meant for xyz. So with that premise my gut says no. I load for other then my own guns however I need the rifle present to start the development process otherwise I am just assuming...which can lead to problems. Always safety first when dealing with firearms, JMO. Return them to your friend and either buy OTC or ask him to share his knowledge in reloading so you can custom load for your rifle. Most reloaders will share their equipment/expertise to those who show interest. A rewarding/addition to this great sport!!!
Best of luck.
BTW, you should be plenty pleased with your choice of scope. 4200 will work nicely on that 270. Enjoy