Does it do this with ammo only or also when empty? It sounds like you don't have enough (any) headspace. And I think that means that the barrel needs to have material removed from the rear face and then re-chambered. Some of the makers of short-stroke toggle links have sets that are longer to correct rifles that have too much headspace. I don't know if they also make sets that are shorter for the opposite reason. I haven't heard of those, but maybe?
Maybe one of the 'smiths on this site who actually knows these things will chime in