diff --git a/backend/src/app.ts b/backend/src/app.ts
index 69b629a..fd92b80 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -117,7 +117,7 @@ const pool = databaseUrl
       password: postgresPassword,
     });
 
-const defaultCalibers = ['9mm', '.22 LR', '5.56 NATO', '.308 Win', '12 Gauge', '.45 ACP'];
+const defaultCalibers = ['9mm', '.22 LR', '5.56 NATO', '.308 Win', '12 Gauge - Birdshot', '12 Gauge - Buckshot', '12 Gauge - Slug', '12 Gauge Sporting', '.45 ACP'];
 const firearmCategories = ['Handgun', 'Rifle', 'Shotgun', 'PCC', 'Other'];
 const sessionHours = 24 * 7;
 
@@ -384,6 +384,21 @@ const ensureSchema = async () => {
 };
 
 const ensureProfileDefaults = async (profileId: string) => {
+  await pool.query(
+    `UPDATE calibers
+     SET name = '12 Gauge Sporting',
+         is_default = TRUE
+     WHERE profile_id = $1
+       AND name = '12 Gauge'
+       AND NOT EXISTS (
+         SELECT 1
+         FROM calibers existing
+         WHERE existing.profile_id = $1
+           AND existing.name = '12 Gauge Sporting'
+       )`,
+    [profileId],
+  );
+
   for (const caliber of defaultCalibers) {
     const caliberResult = await pool.query<CaliberRow>(
       `INSERT INTO calibers (profile_id, name, is_default, is_active)
diff --git a/frontend/src/pages/Home.tsx b/frontend/src/pages/Home.tsx
index 02872f1..ad648da 100644
--- a/frontend/src/pages/Home.tsx
+++ b/frontend/src/pages/Home.tsx
@@ -117,7 +117,8 @@ const ammoPageSelectionKey = 'arsenal-iq-ammo-page-calibers';
 const ammoPageSelectionMigrationKey = 'arsenal-iq-ammo-page-calibers-v2';
 const firearmCategories = ['Handgun', 'Rifle', 'Shotgun', 'PCC', 'Other'];
 const allFirearmCategoriesLabel = 'All categories';
-const defaultCaliberNames = ['9mm', '.22 LR', '5.56 NATO', '.308 Win', '12 Gauge', '.45 ACP'];
+const defaultCaliberNames = ['9mm', '.22 LR', '5.56 NATO', '.308 Win', '12 Gauge - Birdshot', '12 Gauge - Buckshot', '12 Gauge - Slug', '12 Gauge Sporting', '.45 ACP'];
+const boxTrackedCalibers = ['12 Gauge Sporting'];
 
 const currency = new Intl.NumberFormat('en-US', {
   style: 'currency',
@@ -189,6 +190,18 @@ const getCategorySilhouette = (category: string) => {
   return silhouettes[normalized] ?? silhouettes.other;
 };
 
+const isBoxTrackedCaliber = (caliber: string) => boxTrackedCalibers.includes(caliber);
+
+const getAmmoUnitLabel = (caliber: string, quantity: number) => {
+  if (isBoxTrackedCaliber(caliber)) {
+    return quantity === 1 ? 'box' : 'boxes';
+  }
+
+  return quantity === 1 ? 'round' : 'rounds';
+};
+
+const getAmmoUnitNoun = (caliber: string) => (isBoxTrackedCaliber(caliber) ? 'boxes' : 'rounds');
+
 const resolveFirearmImageUrl = (imageUrl: string | null | undefined) => {
   const trimmed = imageUrl?.trim();
 
@@ -1057,7 +1070,7 @@ export default function Home() {
               ) : null}
             </div>
             <div className="mini-stat">
-              <span>{activeView === 'ammo' ? 'Total rounds' : 'Total firearm value'}</span>
+              <span>{activeView === 'ammo' ? 'Total ammo units' : 'Total firearm value'}</span>
               <strong>
                 {activeView === 'ammo'
                   ? data.summary.totalAmmoRounds
@@ -1297,14 +1310,14 @@ export default function Home() {
               </div>
 
               {ammoChartData.length === 0 ? (
-                <p className="placeholder-copy">Add rounds to a caliber to see how your inventory stacks up.</p>
+                <p className="placeholder-copy">Add ammo to a caliber to see how your inventory stacks up.</p>
               ) : (
                 <div className="ammo-chart">
                   {ammoChartData.map((inventory) => (
                     <div className="ammo-chart-row" key={inventory.caliberId}>
                       <div className="ammo-chart-meta">
                         <strong>{inventory.caliber}</strong>
-                        <span>{inventory.roundsOnHand.toLocaleString()} rounds</span>
+                        <span>{inventory.roundsOnHand.toLocaleString()} {getAmmoUnitLabel(inventory.caliber, inventory.roundsOnHand)}</span>
                       </div>
                       <div className="ammo-chart-track" aria-hidden="true">
                         <div
@@ -1320,20 +1333,20 @@ export default function Home() {
 
             <div className="ammo-grid">
               {ammoPageInventory.length === 0 ? (
-                <p className="placeholder-copy">Add an enabled caliber to start tracking rounds on this page.</p>
+                <p className="placeholder-copy">Add an enabled caliber to start tracking ammo on this page.</p>
               ) : (
                 ammoPageInventory.map((inventory) => (
                 <article className="ammo-card" key={inventory.caliberId}>
                   <div className="ammo-card-top">
                     <div>
                       <strong>{inventory.caliber}</strong>
-                      <p>{inventory.roundsOnHand} rounds on hand</p>
+                      <p>{inventory.roundsOnHand} {getAmmoUnitLabel(inventory.caliber, inventory.roundsOnHand)} on hand</p>
                     </div>
                   </div>
 
                   <div className="form-grid compact">
                     <label>
-                      <span>Round adjustment</span>
+                      <span>{isBoxTrackedCaliber(inventory.caliber) ? 'Box adjustment' : 'Round adjustment'}</span>
                       <input
                         type="number"
                         value={ammoAdjustments[inventory.caliberId]?.rounds ?? ''}
@@ -1352,7 +1365,7 @@ export default function Home() {
                   </div>
 
                   <div className="card-footer">
-                    <span>Enter a quantity, then update or remove rounds for this caliber.</span>
+                    <span>Enter a quantity, then update or remove {getAmmoUnitNoun(inventory.caliber)} for this caliber.</span>
                     <div className="button-row">
                       <button className="secondary-button" onClick={() => void adjustAmmo(inventory.caliberId, 'remove')} type="button">
                         Remove ammo