rounds sticking in chamber

[interceptor]

Someone with more reloading expierence than me, PLEASE HELP ME OUT!

Got my brass in from David Davis and I'm trying out seating some Sierra 155gn hpbt Palma Match. Load is 17gn of H110, o.a.l. is 2.20". Problem is, the round sticks, really sticks, in the chamber. Soooo, I'm thinking the long taper is contacting the lands, so I try seating one a little deeper. I go down (in steps) to 2.060", same story. Then I'm thinking maybe my neck o.d. is too big, so I pull out the decapping pin and run a new piece of brass through the full lenght resize die (brass is already primed from D.D.) and seat another bullet starting back at 2.20". Same thing again, stuck like Chuck.

So what's going on? Any one got ideas?