My favorite encore round was the 356 Winchester.
Second in line was the 257 Roberts.

I did have a 308 full bull barrel as well as a 14 twist 243 win that started life as a 6 PPC

Both were fun to shoot the 243 shot 55 gr bullets very well and would detonate a cantaloupe at 350 yards.

If I had to choose one it we 356 Win