avrdude -p m328p -B 3 -P /dev/ttyACM0 -b 19200 -c avrisp -v -v
Notice the -b19200. I use -c stk500v1 usually.
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.02s
avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: safemode: hfuse reads as D6
avrdude: safemode: efuse reads as FD
avrdude: safemode: hfuse reads as D6
avrdude: safemode: efuse reads as FD
avrdude: safemode: Fuses OK (E:FD, H:D6, L:F7)
avrdude done. Thank you.