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.308 diameter bullets in my 303

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    Posted: January 27 2011 at 3:38am
I tried some .308 diameter 150 grain bullets in my No5 Mk1, they shoot to the same point of impact as the .312 diameter  150 grain bullets do.
I can use these in a pinch if I run out of .312 diameter Hornady's.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: January 27 2011 at 11:21am
good to know , did you notice any irregularity ? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cookie Monster Quote  Post ReplyReply Direct Link To This Post Posted: January 28 2011 at 10:16am
They will work with some accuracy in a tight barrel at first, however it will cause premature throat erosion among other long term issues. Remember they make the correct size bullets for a reason.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: January 28 2011 at 11:55am
good point - i have much to learn about ballistics , and thats why i read these forums - thank you 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote White Rhino Quote  Post ReplyReply Direct Link To This Post Posted: January 28 2011 at 10:57pm
Thats a lot of unused space when You compare the 2 size projectiles .... .308" - .312" =.004"  Dont look like Much to us ...But when You are talking gas escaping under pressure Your talking about a very large passage at .004" and erosion will occur... along with many other things .....

Really wish I had some pictures of what Gas under pressure does to a mating surface that has a gap of a very few thousands of an inch .....    
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cookie Monster Quote  Post ReplyReply Direct Link To This Post Posted: January 29 2011 at 3:35am
Exactly Rhino
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 303carbine Quote  Post ReplyReply Direct Link To This Post Posted: January 30 2011 at 11:53am
I would only use the smaller diameter bullets in a pinch if I had to, I have several hundered 311 and 312 diameter slugs for my jungle carbine.
There was nothing different in the way of accuracy while shooting the 308 diameter bullets, no keyholing or anything out the ordinary.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cookie Monster Quote  Post ReplyReply Direct Link To This Post Posted: January 30 2011 at 12:16pm
You would'nt at first 303 but after a few rounds that Hot gas will etch the throat and damage you chamber.
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