diff --git a/pkg/bloomcompactor/controller.go b/pkg/bloomcompactor/controller.go
index 2a4ff6cd45242..2d0f84a7a4055 100644
--- a/pkg/bloomcompactor/controller.go
+++ b/pkg/bloomcompactor/controller.go
@@ -346,6 +346,7 @@ func (s *SimpleBloomController) buildGaps(
 
 			// Fetch blocks that aren't up to date but are in the desired fingerprint range
 			// to try and accelerate bloom creation
+			level.Debug(logger).Log("msg", "loading series and blocks for gap", "blocks", len(gap.blocks))
 			seriesItr, blocksIter, err := s.loadWorkForGap(ctx, table, tenant, plan.tsdb, gap)
 			if err != nil {
 				level.Error(logger).Log("msg", "failed to get series and blocks", "err", err)
@@ -436,6 +437,8 @@ func (s *SimpleBloomController) buildGaps(
 
 			created = append(created, meta)
 			totalSeries += uint64(seriesItrWithCounter.Count())
+
+			s.metrics.blocksReused.Add(float64(len(gap.blocks)))
 		}
 	}
 
diff --git a/pkg/bloomcompactor/metrics.go b/pkg/bloomcompactor/metrics.go
index 74378cb786429..9f844f0e40f73 100644
--- a/pkg/bloomcompactor/metrics.go
+++ b/pkg/bloomcompactor/metrics.go
@@ -32,6 +32,8 @@ type Metrics struct {
 	tenantsCompletedTime *prometheus.HistogramVec
 	tenantsSeries        prometheus.Histogram
 
+	blocksReused prometheus.Counter
+
 	blocksCreated prometheus.Counter
 	blocksDeleted prometheus.Counter
 	metasCreated  prometheus.Counter
@@ -120,6 +122,12 @@ func NewMetrics(r prometheus.Registerer, bloomMetrics *v1.Metrics) *Metrics {
 			// Up to 10M series per tenant, way more than what we expect given our max_global_streams_per_user limits
 			Buckets: prometheus.ExponentialBucketsRange(1, 10000000, 10),
 		}),
+		blocksReused: promauto.With(r).NewCounter(prometheus.CounterOpts{
+			Namespace: metricsNamespace,
+			Subsystem: metricsSubsystem,
+			Name:      "blocks_reused_total",
+			Help:      "Number of overlapping bloom blocks reused when creating new blocks",
+		}),
 		blocksCreated: promauto.With(r).NewCounter(prometheus.CounterOpts{
 			Namespace: metricsNamespace,
 			Subsystem: metricsSubsystem,
diff --git a/pkg/storage/bloom/v1/bounds.go b/pkg/storage/bloom/v1/bounds.go
index 8f3edd914209d..e7ff804d55cdb 100644
--- a/pkg/storage/bloom/v1/bounds.go
+++ b/pkg/storage/bloom/v1/bounds.go
@@ -125,10 +125,21 @@ func (b FingerprintBounds) Intersection(target FingerprintBounds) *FingerprintBo
 // Union returns the union of the two bounds
 func (b FingerprintBounds) Union(target FingerprintBounds) (res []FingerprintBounds) {
 	if !b.Overlaps(target) {
-		if b.Less(target) {
-			return []FingerprintBounds{b, target}
+		if target.Less(b) {
+			b, target = target, b
 		}
-		return []FingerprintBounds{target, b}
+
+		// special case: if the bounds are contiguous, merge them
+		if b.Max+1 == target.Min {
+			return []FingerprintBounds{
+				{
+					Min: min(b.Min, target.Min),
+					Max: max(b.Max, target.Max),
+				},
+			}
+		}
+
+		return []FingerprintBounds{b, target}
 	}
 
 	return []FingerprintBounds{
diff --git a/pkg/storage/bloom/v1/bounds_test.go b/pkg/storage/bloom/v1/bounds_test.go
index e8362a2b283ff..1d687437fab6a 100644
--- a/pkg/storage/bloom/v1/bounds_test.go
+++ b/pkg/storage/bloom/v1/bounds_test.go
@@ -82,20 +82,29 @@ func Test_FingerprintBounds_Intersection(t *testing.T) {
 func Test_FingerprintBounds_Union(t *testing.T) {
 	t.Parallel()
 	target := NewBounds(10, 20)
+
 	assert.Equal(t, []FingerprintBounds{
-		{Min: 1, Max: 9},
+		{Min: 1, Max: 8},
 		{Min: 10, Max: 20},
-	}, NewBounds(1, 9).Union(target))
+	}, NewBounds(1, 8).Union(target))
 	assert.Equal(t, []FingerprintBounds{
 		{Min: 10, Max: 20},
-		{Min: 21, Max: 30},
-	}, NewBounds(21, 30).Union(target))
+		{Min: 22, Max: 30},
+	}, NewBounds(22, 30).Union(target))
 	assert.Equal(t, []FingerprintBounds{
 		{Min: 10, Max: 20},
 	}, NewBounds(10, 20).Union(target))
 	assert.Equal(t, []FingerprintBounds{
 		{Min: 5, Max: 20},
 	}, NewBounds(5, 15).Union(target))
+	// contiguous range, target before
+	assert.Equal(t, []FingerprintBounds{
+		{Min: 10, Max: 25},
+	}, NewBounds(21, 25).Union(target))
+	// contiguous range, target after
+	assert.Equal(t, []FingerprintBounds{
+		{Min: 5, Max: 20},
+	}, NewBounds(5, 9).Union(target))
 }
 
 func Test_FingerprintBounds_Unless(t *testing.T) {
diff --git a/pkg/storage/bloom/v1/index.go b/pkg/storage/bloom/v1/index.go
index 58d43b8cd0aca..eac8276400b97 100644
--- a/pkg/storage/bloom/v1/index.go
+++ b/pkg/storage/bloom/v1/index.go
@@ -218,10 +218,6 @@ type SeriesHeader struct {
 	FromTs, ThroughTs model.Time
 }
 
-func (h SeriesHeader) OverlapFingerprintRange(other SeriesHeader) bool {
-	return h.Bounds.Overlaps(other.Bounds)
-}
-
 // build one aggregated header for the entire block
 func aggregateHeaders(xs []SeriesHeader) SeriesHeader {
 	if len(xs) == 0 {