diff --git a/adaptor/mongodb/bulk.go b/adaptor/mongodb/bulk.go
index 26397766..b7b6cfcc 100644
--- a/adaptor/mongodb/bulk.go
+++ b/adaptor/mongodb/bulk.go
@@ -13,8 +13,7 @@ import (
 )
 
 const (
-	maxObjSize     int = 1000
-	maxBSONObjSize int = 4800000
+	maxBSONObjSize int = 16000000
 )
 
 var (
@@ -53,7 +52,7 @@ func (b *Bulk) Write(msg message.Msg) func(client.Session) (message.Msg, error)
 		b.confirmChan = msg.Confirms()
 		bOp, ok := b.bulkMap[coll]
 		if !ok {
-			s := s.(*Session).mgoSession.Copy()
+			s := s.(*Session).mgoSession.Clone()
 			bOp = &bulkOperation{
 				s:    s,
 				bulk: s.DB("").C(coll).Bulk(),
@@ -69,12 +68,15 @@ func (b *Bulk) Write(msg message.Msg) func(client.Session) (message.Msg, error)
 		msgSize := len(bs) + 4
 
 		// if the next op is going to put us over, flush and recreate bOp
-		if bOp.opCounter >= maxObjSize || bOp.bsonOpSize+msgSize >= maxBSONObjSize {
+		if bOp.opCounter >= s.(*Session).maxWriteBatchSize || bOp.bsonOpSize+msgSize >= maxBSONObjSize {
 			err = b.flush(coll, bOp)
+			if err != nil {
+				log.With("collection", coll).Infof("error flushing collection that has reached its size capacity: %s\n", err.Error())
+			}
 			if err == nil && b.confirmChan != nil {
 				b.confirmChan <- struct{}{}
 			}
-			s := s.(*Session).mgoSession.Copy()
+			s := s.(*Session).mgoSession.Clone()
 			bOp = &bulkOperation{
 				s:    s,
 				bulk: s.DB("").C(coll).Bulk(),
@@ -107,7 +109,7 @@ func (b *Bulk) run(done chan struct{}, wg *sync.WaitGroup) {
 				return
 			}
 		case <-done:
-			log.Debugln("received done channel")
+			log.Infoln("received done channel")
 			if err := b.flushAll(); err != nil {
 				log.Errorf("flush error, %s", err)
 			}
@@ -131,7 +133,7 @@ func (b *Bulk) flushAll() error {
 }
 
 func (b *Bulk) flush(c string, bOp *bulkOperation) error {
-	log.With("collection", c).With("opCounter", bOp.opCounter).With("bsonOpSize", bOp.bsonOpSize).Debugln("flushing bulk messages")
+	log.With("collection", c).With("opCounter", bOp.opCounter).With("bsonOpSize", bOp.bsonOpSize).Infoln("flushing bulk messages")
 	_, err := bOp.bulk.Run()
 	if err != nil && !mgo.IsDup(err) {
 		log.With("collection", c).Errorf("flush error, %s\n", err)
@@ -144,7 +146,7 @@ func (b *Bulk) flush(c string, bOp *bulkOperation) error {
 		}
 	}
 	bOp.s.Close()
-	log.With("collection", c).Debugln("flush complete")
+	log.With("collection", c).Infoln("flush complete")
 	delete(b.bulkMap, c)
 	return nil
 }
diff --git a/adaptor/mongodb/client.go b/adaptor/mongodb/client.go
index 13a9fbf6..41af8dce 100644
--- a/adaptor/mongodb/client.go
+++ b/adaptor/mongodb/client.go
@@ -28,6 +28,9 @@ const (
 
 	// DefaultReadPreference when connecting to a mongo replica set.
 	DefaultReadPreference = mgo.Primary
+
+	// DefaultMaxWriteBatchSize when using the bulk interface
+	DefaultMaxWriteBatchSize = 1000
 )
 
 var (
@@ -65,11 +68,12 @@ type ClientOptionFunc func(*Client) error
 type Client struct {
 	uri string
 
-	safety         mgo.Safe
-	tlsConfig      *tls.Config
-	sessionTimeout time.Duration
-	tail           bool
-	readPreference mgo.Mode
+	safety            mgo.Safe
+	tlsConfig         *tls.Config
+	sessionTimeout    time.Duration
+	tail              bool
+	readPreference    mgo.Mode
+	maxWriteBatchSize int
 
 	mgoSession *mgo.Session
 }
@@ -91,12 +95,13 @@ type Client struct {
 func NewClient(options ...ClientOptionFunc) (*Client, error) {
 	// Set up the client
 	c := &Client{
-		uri:            DefaultURI,
-		sessionTimeout: DefaultSessionTimeout,
-		safety:         DefaultSafety,
-		tlsConfig:      nil,
-		tail:           false,
-		readPreference: DefaultReadPreference,
+		uri:               DefaultURI,
+		sessionTimeout:    DefaultSessionTimeout,
+		safety:            DefaultSafety,
+		tlsConfig:         nil,
+		tail:              false,
+		readPreference:    DefaultReadPreference,
+		maxWriteBatchSize: DefaultMaxWriteBatchSize,
 	}
 
 	// Run the options on it
@@ -270,11 +275,19 @@ func (c *Client) initConnection() error {
 	// mgo logger _may_ be a bit too noisy but it'll be good to have for diagnosis
 	mgo.SetLogger(log.Base())
 	mgoSession.EnsureSafe(&c.safety)
-	mgoSession.SetBatch(1000)
+	mgoSession.SetBatch(100000)
 	mgoSession.SetPrefetch(0.5)
 	mgoSession.SetSocketTimeout(time.Hour)
 	mgoSession.SetMode(c.readPreference, true)
 
+	// Lets set the max batch size
+	var results bson.M
+	err = mgoSession.DB("").Run("isMaster", &results)
+	if err != nil {
+		return client.ConnectError{Reason: err.Error()}
+	}
+	c.maxWriteBatchSize = results["maxWriteBatchSize"].(int)
+
 	if c.tail {
 		log.With("uri", c.uri).Infoln("testing oplog access")
 		localColls, err := mgoSession.DB("local").CollectionNames()
@@ -303,5 +316,5 @@ func (c *Client) initConnection() error {
 // Session fulfills the client.Client interface by providing a copy of the main mgoSession
 func (c *Client) session() client.Session {
 	sess := c.mgoSession.Copy()
-	return &Session{sess}
+	return &Session{sess, c.maxWriteBatchSize}
 }
diff --git a/adaptor/mongodb/session.go b/adaptor/mongodb/session.go
index 3ea607c9..76c5abe6 100644
--- a/adaptor/mongodb/session.go
+++ b/adaptor/mongodb/session.go
@@ -8,6 +8,7 @@ import (
 // Session serves as a wrapper for the underlying mgo.Session
 type Session struct {
 	mgoSession *mgo.Session
+	maxWriteBatchSize int
 }
 
 var _ client.Session = &Session{}