.303 Magnum

The .303 Magnum is an obsolete medium bore rifle cartridge.

.303 Magnum
TypeRifle
Place of originEngland
Production history
DesignerW.J. Jeffery & Co
Designed1919
Produced1919
Specifications
Parent case.276 Enfield
Case typeSemi-rimmed or rimless, bottleneck
Bullet diameter.312 in (7.9 mm)
Neck diameter.345 in (8.8 mm)
Shoulder diameter.462 in (11.7 mm)
Base diameter.530 in (13.5 mm)
Rim diameter.557 in (14.1 mm)
Case length2.35 in (60 mm)
Overall length3.35 in (85 mm)
Case capacity73.6 gr H2O (4.77 cm3)
Ballistic performance
Bullet mass/type Velocity Energy
174 gr (11 g) 2,850 ft/s (870 m/s) 3,050 ft⋅lbf (4,140 J)
Source(s): Cartridges of the World.[1]

Overview

The .303 Magnum was a bottlenecked centerfire rifle cartridge that was produced in both semi-rimmed and rimless versions. The cartridge fired a projectile of 174 grains (11.3 g) at 2,850 feet per second (870 m/s). The cartridge's case capacity was the same as the .30-06 Springfield, although performance was considered to favour the .303 Magnum.[1][2][3]

The .303 Magnum was developed by W.J. Jeffery & Co by necking up the experimental .276 Enfield to .312 inches (7.9 mm), it was introduced in 1919 for target shooting and was used for some time by the British Match Rifle Committee. The cartridge had a brief life, only appearing in the Kynoch catalogue until 1930 and it appears to have become obsolete by 1932.[1][2][3]

gollark: ```sqlnonlocality=# EXPLAIN ANALYZE SELECT url, ts_rank(fts, query) AS rank, ts_headline(fts::text, query, 'MaxWords=60') FROM pages, websearch_to_tsquery('bee') query WHERE fts @@ query ORDER BY rank LIMIT 1; QUERY PLAN -------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=860.79..861.06 rows=1 width=96) (actual time=35935.590..35935.594 rows=1 loops=1) -> Result (cost=860.79..874.83 rows=52 width=96) (actual time=35935.587..35935.589 rows=1 loops=1) -> Sort (cost=860.79..860.92 rows=52 width=178) (actual time=35934.109..35934.111 rows=1 loops=1) Sort Key: (ts_rank(pages.fts, query.query)) Sort Method: top-N heapsort Memory: 25kB -> Nested Loop (cost=0.25..860.53 rows=52 width=178) (actual time=444.148..35932.932 rows=349 loops=1) Join Filter: (pages.fts @@ query.query) Rows Removed by Join Filter: 10272 -> Function Scan on websearch_to_tsquery query (cost=0.25..0.26 rows=1 width=32) (actual time=0.038..0.041 rows=1 loops=1) -> Seq Scan on pages (cost=0.00..728.95 rows=10495 width=142) (actual time=10.189..289.581 rows=10621 loops=1) Planning Time: 0.184 ms Execution Time: 35935.637 ms(12 rows)```
gollark: What? Why does it say it's doing a sequential scan now? Æ all is bee.
gollark: Slower, even.
gollark: Oops, it turns out I'm accidentally sorting by it instead of the rank, but it's equally slow after fixing that.
gollark: ```nonlocality=# EXPLAIN ANALYZE SELECT url, ts_rank(fts, query), ts_headline(fts::text, query, 'MaxWords=60') AS rank FROM pages, websearch_to_tsquery('bee') query WHERE fts @@ query ORDER BY rank LIMIT 1; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=860.92..860.92 rows=1 width=96) (actual time=8506.425..8506.427 rows=1 loops=1) -> Sort (cost=860.92..861.05 rows=52 width=96) (actual time=8506.423..8506.425 rows=1 loops=1) Sort Key: (ts_headline((pages.fts)::text, query.query, 'MaxWords=60'::text)) Sort Method: top-N heapsort Memory: 25kB -> Nested Loop (cost=688.65..860.66 rows=52 width=96) (actual time=1.362..8505.403 rows=348 loops=1) -> Function Scan on websearch_to_tsquery query (cost=0.25..0.26 rows=1 width=32) (actual time=0.023..0.025 rows=1 loops=1) -> Bitmap Heap Scan on pages (cost=688.40..846.49 rows=52 width=142) (actual time=0.353..1.502 rows=348 loops=1) Recheck Cond: (fts @@ query.query) Heap Blocks: exact=231 -> Bitmap Index Scan on page_search_index (cost=0.00..688.39 rows=52 width=0) (actual time=0.320..0.320 rows=387 loops=1) Index Cond: (fts @@ query.query) Planning Time: 0.190 ms Execution Time: 8506.463 ms(13 rows)```

See also

References
  1. Frank C. Barnes, Cartridges of the World, 13th ed, Gun Digest Books, Iola, 2012, ISBN 978-1-4402-3059-2.
  2. Don Davie, "The other .303 cartridges", acant.org.au, retrieved 25 January 2015.
  3. Imperial War Museums, "7.7 x 59.4Sr: Kynoch; .303 Magnum", iwm.org.uk, retrieved 10 November 2017.
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