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Old 10-07-2010, 01:51 PM
JackoP's Avatar
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Working out overall length / Seating depth for .303.35

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G/Day folks, a couple of Wildcat newby questions

still waiting on my rifle to be No1 Mk3 custom to be finished but I'm at the stage now where the Gunsmith has requested a couple of dummy rounds to work out the throat and neck for it. He's cobbling together the tools to ream my chamber from a .303 and a .357 rifle reamer and bushing up the pilot.

I've used a .358 Winchester die to expand the cases. I was surprised at how basic it is to do, I just eased the lever on the press up and down a couple of times, no case necks split. I am confident I have safe powder charges sorted out but am not confident with determining how deep I seat the bullets and the connection between correct seating depth and pressures.

It seems reasonable to me to use .303 British case length but where I'm not sure is how to determine overall cartridge length to ensure my dummy rounds are right when using the .358 proj. I'll mostly be using 225 grain Speer Gameking .358 projectiles which are somewhat stumpy when compared to .311 220 gr projectiles.

The OAL of the .303 British ranges from 2.915 to 3.075 depending on the weight of projectile obviously, how do I determine this for my 303.35 when starting from scratch

regards Jacko
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Old 10-07-2010, 02:43 PM
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You want them to clear the mag well by, oh, 0.050" or so I would guess. So, I'd seat up dummies with the bullets you most likely will use and send them all to him. If they have cannelures, seat so that the cannelure is even with the case mouth.

Good luck

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Old 10-08-2010, 02:48 AM
JackoP's Avatar
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Join Date: Dec 2008
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Thanks MikeG, the Sierra's do not have cannelures and I will seat them as you have suggested. I was pondering today that seating them at least 1 caliber deep in the case neck or at least as deep as the base of the case neck. I have a Gunsafe full of tube magazine Levers and working with the internal dimensions of the magazine would have been the last thing I thought of

Have not even fired a round from this new rifle and I've learned a lot. Usually a danger sign for my bank balance

regards Jacko
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Old 10-08-2010, 06:12 AM
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Join Date: Sep 2009
Location: Mooresville, IN
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If your magazine well is large enough that you can seat bullets to where they almost fall out of the case, then you need to look at what you're wanting to achieve from the gun. (If the well is short, you don't have much of an option, unless you want to single-feed.)

Your logic of one caliber deep, or to the base of the neck (which is frequently going to be one caliber long ) is sound. A lot of newer cartridges, and many wildcats, go with even shorter necks than this, but I don't think of these as ideal designs unless you're using a single-shot, or will load/shoot your gun as though it is.
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Old 10-24-2010, 02:50 PM
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Join Date: Jun 2009
Posts: 50
IIRC the front lip tab on the magazine holds the cartridge in line by touching the bullet. make sure your bullet seating depth for your enfield lets the loaded cartridge sit in the magazine correctly....mis-feeds may result if too short on C.O.L.

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