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Thread: .318'' groove No.4 Enfield, what bullet to use?

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    Member paddywonka's Avatar
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    .318'' groove No.4 Enfield, what bullet to use?

    Own a early N0.4 Mk1 Fazakerley Enfield Rifleicon that I am getting ready to load for. The bore is a near mint 2 groove. Thought I would start by slugging the barrel before ordering up some bullets. Lubed the bore & a lead .314'' diameter pistol bullet, and ran it down the bore. The bullet measured .304"+(not quite .3045") by .318"+(again not quite .3185"). Measured with a good vernier caliper and a micrometer. To be sure I read the bullet 5 times. And just for good measure, ran a second bullet down the barrel and measured it. The results were the same. I have yet to shoot this rifle, though I have owned it for over 5 years, so do not know how military or commercial ammo would preform from it. The question I have is should I use a bullet like a jacketed 'J' bore 8mm Mauser bullet .318"diameter? What size cast bullet would be best? Thinking a 175 jacketed 'J' bore bullet would be best weight wise, so as to keep the load in the same weight category. Any advice would really be appreciated.

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    Man thatís a big bore on an Enfield even my worn out ones slug better than that. .318 J Mauser bullets would be where I start. Cast would probably take a custom mould of your choice in the .319 to .320 range. Weight in cast is not as big a deal to me because you canít match the velocity. Iíd ask if your confident on your measurement but it sounds like you are.

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    Really Senior Member bob q's Avatar
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    I would be very careful using the Woodleigh .318 bullet . A long groove diameter bullet with your very deep rifling will cause massive pressure spike . Also with a big cast bullet the rifling will cut the bullet deeply and affect accuracy , depending on what you are looking for in accuracy . I would try a Hornady .312 174 round nose bullet at a medium velocity . It should grab your .304 lands and should stay straight due to its long cylinder shape . Speer did make [ a long time ago when Speer KNEW how to make bullets for military rifles ] a .313 215 grain round nose that does work great . They can still be found here and there .

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    Advisory Panel green's Avatar
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    a .318" bullet in a .303" chamber will be a jam fit and can cause high pressure since the case neck cannot release the bullet.

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    A .318" groove diameter isn't really all that uncommon. If the attached engineering drawing (source?) is credible, it's actually within specs. Before venturing into oversize jacketed bullets, it would be worthwhile to try normal .311" to .313" projectiles. You might be pleasantly surprised.

    As for cast, I've tried unsized bullets dropping ~.316" in my 2-groove Savage that goes about .304"x.318". Accuracy isn't great but OK for short-range plinking and practice.

    Last edited by Parashooter; 04-14-2019 at 11:52 AM.

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    Really Senior Member bob q's Avatar
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    A .318 bullet in a .303 chamber would only be a problem if you could not close the bolt cleanly . It may , that would depend on the dia of the chamber neck . The neck having to " expand to release the bullet " is BS . It does not expand when you pull the bullet out with pliers by hand .

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    BS? Now that is a technical acronym I am not familiar with. Please explain in more detail.
    "Close the bolt cleanly". Please explain.
    As to the neck not releasing the bullet and running up pressure it is discussed in "Hatcher's Notebook" and was determined to cause high pressure.

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    Hatcher's jamming a case mouth into a bullet is not the same as the neck having to expand to release a bullet . It was all explained in an earlier post . Maybe someone will link to it for you .

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    Technical Terminology

    Quote Originally Posted by green View Post
    BS? Now that is a technical acronym I am not familiar with. Please explain in more detail.
    Ballistically Suspect ?

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