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08-20-2012, 06:06 PM
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Join Date: Nov 2011
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.303 bullet question
I was looking at wholesale sports website and I noticed speer makes .303 bullets in .311 and hornady makes them in .312, both listed as 7.7mm Jap. Is there any real difference in the two, advantages/disadvantages?
Thanks in advance
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08-20-2012, 06:38 PM
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I believe it's due to the loose tolerances during the war when enfields were made. I've also heard that you can use .30 cal (.308) bullets. Someone correct me if I'm wrong!
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08-20-2012, 06:43 PM
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Some people have used .308 bullets, depending on the Enfield the bore can be anywhere from .310 to almost .315!
.311 is the most cmmon bullet however, but .312 will not make a big difference.
the biggest difference difference in tolerances , and Speer builds good bullets , as does Hornady.
You would have to test both to see which one shoots better.
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't! 
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08-20-2012, 06:45 PM
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Join Date: May 2012
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You "can" use .308 cal if your bore is sized to it. Most bores in .303's are .311-.313 though. Some even as far as .316. Your best bet to figure out what you need, take your .303 to a qualified gunsmith to check the bore size
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08-20-2012, 08:38 PM
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Correct me if I did the wrong thing but I "slugged" the barrel on my .303 and it was quite easy. Drove a lead fishing weight through with a wooden dowel and then measured it with a micrometer/
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08-20-2012, 08:51 PM
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Quote:
Originally Posted by deanmc
Correct me if I did the wrong thing but I "slugged" the barrel on my .303 and it was quite easy. Drove a lead fishing weight through with a wooden dowel and then measured it with a micrometer/
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That'll do it. 
Cat
__________________
Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't!
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08-20-2012, 10:25 PM
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Join Date: Nov 2011
Location: The City that rhymes with fun...
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Quote:
Originally Posted by deanmc
Correct me if I did the wrong thing but I "slugged" the barrel on my .303 and it was quite easy. Drove a lead fishing weight through with a wooden dowel and then measured it with a micrometer/
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thats a really cool idea, I think i'll try that!!
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Dear NASA, your mom thought I was big enough. -Pluto
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08-21-2012, 12:24 AM
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Join Date: Apr 2011
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Come to think of it I do have an Enfield! Im gonna go try that!
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Cynicism gives you a huge advantage in a world that deserves disbelief.
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08-21-2012, 10:18 AM
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Hey Cat, any issues with over pressure using a .312 bullet in a .303? I know it's only a hundreth of an inch but it's a pretty old cartridge...
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08-21-2012, 11:35 AM
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Join Date: Oct 2007
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actually, one one thousandth.
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08-21-2012, 12:04 PM
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Join Date: Jan 2011
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Quote:
Originally Posted by jednastka
actually, one one thousandth.
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Yes, 1/1000th.
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08-21-2012, 12:45 PM
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Join Date: Jun 2007
Location: Ft. McMurray
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Quote:
Originally Posted by ShawnM
Hey Cat, any issues with over pressure using a .312 bullet in a .303? I know it's only a hundreth of an inch but it's a pretty old cartridge...
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Nope, no issues .
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't!
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08-21-2012, 12:52 PM
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Join Date: Jan 2008
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slugging
It's a little more sporting slugging an odd numbered groove barrel and getting an accurate measurement.Harold
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08-21-2012, 01:37 PM
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Join Date: Nov 2011
Location: The City that rhymes with fun...
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Quote:
Originally Posted by Pioneer2
It's a little more sporting slugging an odd numbered groove barrel and getting an accurate measurement.Harold
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Hmm, should have thought of that, it is a 5 groove. I think I'll take it in and get a pro's .02$
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Dear NASA, your mom thought I was big enough. -Pluto
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08-21-2012, 03:37 PM
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Join Date: Nov 2010
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You need a 72 degree vee block or a micrometer with a vee anvil. A tapered plug gauge will also give a reasonably precise measurement but only of the very edge of the bore. Ring gauges offer an alternate means of measuring groove diameter. Leeper
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