diff --git a/README.md b/README.md
index 75cf58e..090fce6 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,12 @@ sample_app is an example for how to build and link an application in cFS. See al
 
 ## Version History
 
+### Development Build: v1.3.0-rc4+dev4
+
+- Use CFE_MSG_PTR conversion macro
+- Update baseline for cFS-Caelum-rc4 to v1.3.0-rc4
+- See <https://github.com/nasa/sample_app/pull/163> and <https://github.com/nasa/cFS/pull/390>
+
 ### Development Build: v1.2.0-rc1+dev73
 
 - Apply CFE_SB_ValueToMsgId where required
diff --git a/fsw/src/sample_app.c b/fsw/src/sample_app.c
index 317d734..cad0cfe 100644
--- a/fsw/src/sample_app.c
+++ b/fsw/src/sample_app.c
@@ -163,7 +163,7 @@ int32 SAMPLE_APP_Init(void)
     /*
     ** Initialize housekeeping packet (clear user data area).
     */
-    CFE_MSG_Init(&SAMPLE_APP_Data.HkTlm.TlmHeader.Msg, CFE_SB_ValueToMsgId(SAMPLE_APP_HK_TLM_MID),
+    CFE_MSG_Init(CFE_MSG_PTR(SAMPLE_APP_Data.HkTlm.TelemetryHeader), CFE_SB_ValueToMsgId(SAMPLE_APP_HK_TLM_MID),
                  sizeof(SAMPLE_APP_Data.HkTlm));
 
     /*
@@ -327,8 +327,8 @@ int32 SAMPLE_APP_ReportHousekeeping(const CFE_MSG_CommandHeader_t *Msg)
     /*
     ** Send housekeeping telemetry packet...
     */
-    CFE_SB_TimeStampMsg(&SAMPLE_APP_Data.HkTlm.TlmHeader.Msg);
-    CFE_SB_TransmitMsg(&SAMPLE_APP_Data.HkTlm.TlmHeader.Msg, true);
+    CFE_SB_TimeStampMsg(CFE_MSG_PTR(SAMPLE_APP_Data.HkTlm.TelemetryHeader));
+    CFE_SB_TransmitMsg(CFE_MSG_PTR(SAMPLE_APP_Data.HkTlm.TelemetryHeader), true);
 
     /*
     ** Manage any pending table loads, validations, etc.
diff --git a/fsw/src/sample_app_msg.h b/fsw/src/sample_app_msg.h
index cfee86a..8d3785a 100644
--- a/fsw/src/sample_app_msg.h
+++ b/fsw/src/sample_app_msg.h
@@ -71,8 +71,8 @@ typedef struct
 
 typedef struct
 {
-    CFE_MSG_TelemetryHeader_t  TlmHeader; /**< \brief Telemetry header */
-    SAMPLE_APP_HkTlm_Payload_t Payload;   /**< \brief Telemetry payload */
+    CFE_MSG_TelemetryHeader_t  TelemetryHeader; /**< \brief Telemetry header */
+    SAMPLE_APP_HkTlm_Payload_t Payload;         /**< \brief Telemetry payload */
 } SAMPLE_APP_HkTlm_t;
 
 #endif /* SAMPLE_APP_MSG_H */
diff --git a/fsw/src/sample_app_version.h b/fsw/src/sample_app_version.h
index b75940a..fddd423 100644
--- a/fsw/src/sample_app_version.h
+++ b/fsw/src/sample_app_version.h
@@ -31,16 +31,23 @@
 
 /* Development Build Macro Definitions */
 
-#define SAMPLE_APP_BUILD_NUMBER 73 /*!< Development Build: Number of commits since baseline */
+#define SAMPLE_APP_BUILD_NUMBER 4 /*!< Development Build: Number of commits since baseline */
 #define SAMPLE_APP_BUILD_BASELINE \
-    "v1.2.0-rc1" /*!< Development Build: git tag that is the base for the current development */
+    "v1.3.0-rc4" /*!< Development Build: git tag that is the base for the current development */
 
 /* Version Macro Definitions */
 
-#define SAMPLE_APP_MAJOR_VERSION 1  /*!< @brief ONLY APPLY for OFFICIAL releases. Major version number. */
-#define SAMPLE_APP_MINOR_VERSION 1  /*!< @brief ONLY APPLY for OFFICIAL releases. Minor version number. */
-#define SAMPLE_APP_REVISION      99 /*!< @brief ONLY APPLY for OFFICIAL releases. Revision version number. */
-#define SAMPLE_APP_MISSION_REV   0  /*!< @brief ONLY USED by MISSION Implementations. Mission revision */
+#define SAMPLE_APP_MAJOR_VERSION 1 /*!< @brief ONLY APPLY for OFFICIAL releases. Major version number. */
+#define SAMPLE_APP_MINOR_VERSION 1 /*!< @brief ONLY APPLY for OFFICIAL releases. Minor version number. */
+#define SAMPLE_APP_REVISION      0 /*!< @brief ONLY APPLY for OFFICIAL releases. Revision version number. */
+
+/*!
+ * @brief Mission revision.
+ *
+ * Set to 0 on OFFICIAL releases, and set to 255 (0xFF) on development versions.
+ * Values 1-254 are reserved for mission use to denote patches/customizations as needed.
+ */
+#define SAMPLE_APP_MISSION_REV 0xFF
 
 #define SAMPLE_APP_STR_HELPER(x) #x /*!< @brief Helper function to concatenate strings from integer macros */
 #define SAMPLE_APP_STR(x) \
diff --git a/unit-test/coveragetest/coveragetest_sample_app.c b/unit-test/coveragetest/coveragetest_sample_app.c
index 7f35eaa..76db764 100644
--- a/unit-test/coveragetest/coveragetest_sample_app.c
+++ b/unit-test/coveragetest/coveragetest_sample_app.c
@@ -418,12 +418,11 @@ void Test_SAMPLE_APP_ReportHousekeeping(void)
 
     /* Confirm message sent*/
     UtAssert_True(UT_GetStubCount(UT_KEY(CFE_SB_TransmitMsg)) == 1, "CFE_SB_TransmitMsg() called once");
-    UtAssert_True(MsgSend == &SAMPLE_APP_Data.HkTlm.TlmHeader.Msg, "CFE_SB_TransmitMsg() address matches expected");
+    UtAssert_ADDRESS_EQ(MsgSend, &SAMPLE_APP_Data.HkTlm);
 
     /* Confirm timestamp msg address */
     UtAssert_True(UT_GetStubCount(UT_KEY(CFE_SB_TimeStampMsg)) == 1, "CFE_SB_TimeStampMsg() called once");
-    UtAssert_True(MsgTimestamp == &SAMPLE_APP_Data.HkTlm.TlmHeader.Msg,
-                  "CFE_SB_TimeStampMsg() address matches expected");
+    UtAssert_ADDRESS_EQ(MsgTimestamp, &SAMPLE_APP_Data.HkTlm);
 
     /*
      * Confirm that the CFE_TBL_Manage() call was done