My choice was to build a .358 WSSM (.25 WSSM parent case) on a Savage Model 11 FNCS. Dies are "off the shelf" custom dies from Redding. Chamber reamer came from Dave Manson, and is the "Redding Spec" design.
I can exceed Winchester's factory 200gr loads for .358 Win ballistics, and I'm exceeding .35 Rem ballistics by ~300 fps using 180gr, 200gr and 225gr bullets. Basically this is a 250yard North American game gun, and potentially 300 yards for whitetail. 225gr SGK @ 2350fps, 200gr Hornady Interlock SP @ 2550fps. I can easily download to .35 Rem specs but I give up trajectory.
The cheap route to a 200 yard Indiana Deer Rifle is to ream out a 24" .357 Mag H&R single shot to .357 Max. People are matching .35 Rem ballistics (~2200-2300fps with 180 bullets) with A1680 powder.
Other wildcats include .358 Gremlin (6.5 Grendel necked up) .358 GNR, .358 Grant (the max you can get under current laws).
The .458 SOCOM will get the job done out to 200 yards, but with an upper costing up near a grand, I saved money.
I contemplated a .454 Puma 92 (since I've been hunting for several years with a 9.5" SRH .454) and a .45 Colt H&R single shot, but a friend of mine is a big time hunter and wanted a 300 yard deer gun, and .358 WSSM was the easiest way to get there... and he paid for the tooling (reamer and gauges).
Many of the 50 cal muzzleloaders with .45 cal sabots, and many of the new 50 cal bullets will get you out to 200 yards, and you can double the length of your season, and stay under $400 -- this is the route I would go for the least money. I hunted once with an Rem 1100 and immediately went back to my .454 revolver -- same range, much better accuracy, much cheaper ammunition.
My rifle cost me $450 w/shipping and FFL transfer and the barrel was <$300 installed.
To see how accurate this rifle is look at the groups my buddy shot here (scroll to near the bottom).
http://www.mcgowenbarrel.com/testimonials.htm
