Warf, why not get a nice Remington 870 with fully rifled barrel and just shoot big full bore slugs? Winchester offered a 70-150 Model 1887 Rifle long time ago in a lever action. Started life as a 12ga Rolling Block Lever Action Shotgun, so Winchester just installed a rifled barrel. They necked down a BRASS 12ga shell for the .730 slug and voila! You gotta' 70-150 Winchester! The biggest and baddest Winchester Lever Action ever produced!!
Details & Photos:
http://shootersforum.com/showthread.htm?t=14386"An original John Browning design, the Model 1887 12 and 10 ga. lever-action shotgun is one of the rarest and most unusual shotguns ever built. Total production between 1887 and 1898 was only 64,855 guns, and then an improved Model 1901 in 10 ga. only was introduced.
A lesser-known, but fascinating fact is that Winchester actually chambered the M1887 for the 70-150 Winchester rifle cartridge based on a necked-down brass, 12 ga. shotgun shell. The load was 150 grs. of powder with a bullet of 700 and 900 grs. Three such guns are known to exist.The "New Model" 1887 was reverse-engineered from the improved Model 1901 and is now produced by the famous ADI Limited Lithgow Facility in Austrialia, that currently produces Steyr AUG and FN small arms for Australian and other defense forces.
Lithgow's Model 1887 is a finely fitted and finished 2 3/4" 12 ga. shotgun of historic significance. It sports an improved cylinder, 22" chrome-lined barrel, and American walnut stocks, and weighs 8.75 lbs. The magazine accepts five shells, and the rolling-block action is smooth as silk.
Suggested retail price is S1,195, and considering the complexity of the action, that's a reasonable price. This traditional Model 1887 will sell well with the cowboy action shooters, and those who simply enjoy owning and shooting something a bit different and tinged with nostalgia."
The modern day 12bore version of the 70-150 is a Dixie Slugs "Terminator Express" of 740grains @ 1250fps.
L to R
70-150-900gr Winchester
.58 Berdan Musket centrefire
50-70 US Govt Benet cup primed
45-75 Winchester
45-50 Peabody
44-60 Sharps
50-70 USG centerfire