I'd venture to guess the 35-348 would clock 2400-2500 with the 220's since that is about what my 358 does with the 220 Speers and they work plenty good on deer.
348 Ackley would be a beast though. I have a plain old 348 Win carbine and 250's at 2300 are very accurate and plow through stuff real nice. Be a cool conversion though, no idea if 348 would leave enough meat for a rebore though.
