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In Reply to: RE: The rimmed version was used by the IJN's copy of the Vickers gun e.g. in the cockpit/nose of Zeros posted by Timbo in Oz on March 14, 2017 at 14:01:13
Very similar but not the same.
The 7.7X58mm were IJA rounds. The 7.7X56 was an IJN copy of the .303.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Follow Ups:
Neither of the Japanese rounds a ballistic 'monster'.
And in aircraft use, not even CLOSE to the 50cal browning stuff on US aircraft of the day.
Too much is never enough
Bear in mind that the Zero carried a 20mm cannon in each wing. The really weakly armed WWII Japanese fighter was the IJA's Oscar. Initially just2 rifle calibre MGs, and later two relatively week 12.7mm jobs.
The ANM2 .5" Browning HMG was the 2nd best aircraft Heavy MG of WWII. They worked 'well enough' in USN and USAAF fighters. Once they were installed in quantity (6 or 8) and were just effective enough to last out the war. Given the difficulties of the US's 20mm program at the time. Your fighter pilots were lucky. See the table in the article attached.
OTOH in 1940 the RAF's Hurricane MkIs could have carried 4 of them, as Belgium's airforce and Fabrique Nationale did try this out. Too late to matter.
Ballistics became of interest to me after doing my marksmanship and coaching course, and partly because I was still hunting, and planned to start reloading. I found a copy of 'Guns of the RAF' in the local public library.
More recently I came across a site based in the UK, one article of which is right on the money about WWII fighter armament. Click below!
The site has another article on the sorry tale of the USA's WWII attempts to get the Hispano 20mm into service. Mostly due to an ammunition greasing / case sizing issue. The whole site is worth a read.
I bet you'd find it fascinating.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Interesting table.
I knew about how short the effective range was for aircraft mount MGs. But the Germans did have great luck with the thru-prop-hub 20mm cannon of the '109. Very Destructive.
I know the US P38 had a cannon, having a LOT of room in the nose, but don't know about others so equipped.
When I worked for the county in which I lived, I visited the Ballistics / Crime Lab and they had in their possession, a 20mm AntiTank Rifle of WWII vintage.
I have NO idea what a citizen was doing with THIS particular piece of history. And AMMO!
Too much is never enough
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