Until the recent advent of the new 6.8mm Remington round most all .277" bullets were designed with the .270 Win. or .270 Whby. in a rifle in mind. This means performance on game of them in a smller round from a handgun is questionable.
The .30-30 case improved and the .225 Win. case are very similar in size BUT the .225 is a much stronger case. SSK offers the .270 JDJ on the .225 Case I believe.
The new bullets becoming available for the 6.8 Rem. might make this a more viable hunting round for the future.