You may lose 50-100 fps over some longer barreled 7x57's but I doubt the deer will notice. Also, it has been my experience that shorter barrels tend to shoot better.
ddj
Many men go fishing all their lives without knowing that it is not fish they are after. - Henry David Thoreau
The best part of hunting and fishing was the thinking about going and the talking about it after you got back. - Robert Ruark