I've tried this a time or two with BF CLP and it does cut down on the brushing time significantly.Get a little pump sprayer. Put some Boretech Eliminator or Gunzilla in it. At the range, while the gun is still warm (this is critical to best effect) squirt a couple of pumps into the chamber and let it run to the muzzle and coat the bore.
I haven't tried either Boretech Eliminator or Gunzilla--guess I'll have to start looking around for some to test.