I use a Beretta Pintail semi-auto with 24" Rifled barrel with Winchester SSP12 Supreme Partition Gold Slugs, I easily achive groups less than 2" at 100yrds and less than 4" groups at 150 yards,...not a rifle for sure, but great for a slug gun.
The Beretta Pintail has the older Benelli SL80 design where the action and barrel are one piece (like a bolt action rifle), hence no need for a cantelever mount. and a much more accurate gun. I use a Bushnell 3200 1.5 x 4,...I zero in my scope at 100 yrds.
This ammo sells at LeBaron's for $ 12.72 for a box of 5, before tax.
Use Winchester's Ballistic Calculater too see results -
http://ballisticscalculator.winchester.com/
Here is an article I found.
Winchester SSP12 Supreme Partition Gold Slugs
Second generation sabot slugs,in a 2 3/4 inch shell, and 385 grain (7/8 oz) hollowpoint slug. The slug is a copper jacketed 4-petal (notched hollowpoint) bullet of ~.50 caliber. It gives good expansion from the notched hollowpoint. The advertised velocity is 1900 fps at 3 ft.
This is a "magic bullet", although at a high price. It performs admirably with less than 2 inch groups at 100 yards and 3-4 inch groups at 200 yards. This was in my Remington Wingmaster 12 gauge pump with Hastings 24" rifled barrel and 4-12x by 42 scope. I zeroed it at 150 yards, and the ballistics tables showed a 6.8 inch drop at 200 yards. Actual performance was a 7.1 inch drop at 200 yards. If one wants to shoot a tight group, then use all the shells from the same box, because I noticed slight differences between boxes even though they were from the same manufacturing lot (bought from different places).
There is no shotgun slug that equals the performance of this Winchester SSP12 shell. In fact, the SSP12 gives a far smaller group at 200 yards than the premium Federal shells can do at 100 yards.
