If your best friend reloads for 270 and you are asking what bullet to use well...the sky is the limit really. I reload for my 270 and 270 WSM and really like the Nosler BT's Accubonds and Partitions. I seem to get the best groups with the Accubonds. I reload mainly for deer hunting so you prob don't need a bonded bullets for dogs.

I have an Encore in 7mm-08 and reload for that also. Reloading for a break open single shot is a little different then others. You can usually seat the bullet out a bit further then what the book says or what your friend may use in his rifle(assuming its a bolt, pump, auto etc..)

Usually for my bolts I spend more time changing powder and bullets to get a accurate load then by adjusting the bullet seating compared to what I did for my Encore. I messed around with the bullet depth more then I usually do since I had a larger range on where to seat it.

If you are going to buy factory stuff I would also recommend the Fed. Fusions, I have had some good luck with them in my 308 and 30-06 (got them on sale). I also would prob lean to the 110 grn load for dogs but theres nothing wrong with using the 130's.

I'm sure if your buddy reloads you guys can work up a load that should be fine for your rifle. Like the other poster mentioned 1.5-2" high at 100 is prob best way to sight in the gun.