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Old 06-23-2007, 07:52 AM
NFG NFG is offline
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Lee Enfield 375 JDJ?


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Has anyone out there in Oz land converted any L.E. 303/308 to 375 JDJ, by any chance?

I'm doing one now using an Isapore action. So far just minor extractor shape grinding and using a 10 rnd 303 mag with the 308 lifter. Might have to do some minor shaping work on the feed ramp or use protected point bullets. Have a Boyds stock on order but they won't start a run until Aug, and the barrel is on it's way.

Should get 23-2400 f/s with a 270 gr bullet and 21-2200 f/s with a 300 gr in a 20" barrel without undue pressure. Looks to me like a charging 'roo stopper par excellence or almost anything else for that matter.

It's primary use will be as a backup/pickup/knockaround with fixed sights and whatever load regulates to zero at 125 yds.

Just something different to do and I've always wanted a 375 JDJ anyhow.

Thanks
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Old 06-24-2007, 12:11 AM
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Isapore Enfield 375 J.D.J.

You made a good choice in selecting a No. III Isapore Enfield as opposed to any other No. III or any of the No. 4's. If you are going to convert an Enfield to 375 JDJ and expect 23-2400 fps with a 270 grain bullet it will need to be the Isapore Enfield. It is rated at 62,000 psi and all other Enfields are at 49,000 psi.

The Isapore is chambered in 7.62 X 51 NATO and was designed for the cartridge and is not a converted .303 NO. III Enfield. The steel is stronger.

To get your target velocity of 23-2400 fps with a 270 grain bullet out of a 20" barrel, it will require 58,000 to 60,000 psi. Here are some MAXIMUM 95% density loads that generate these pressures: (as usual, start much lower and work up).

57.0 grains of any of the following:

H335: 2353 fps. 3322 ft.lbs.
Varget: 2330 fps. 3257 ft.lbs.
IMR4064: 2341 fps. 3288 ft.lbs.
AA2520: 2307 fps. 3193 ft.lbs.

Since you are converting a surplus military rifle with an unknown history, it is highly recommended that you have the rifle inspected by a qualified gunsmith and start at 45 grains and work up. This will still get you about 2000 fps at about 47,000 psi. That's good for 2400 ft.lbs.

Good luck with the project.
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Old 06-24-2007, 08:51 AM
NFG NFG is offline
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Thanks Nitro.

I picked the 2a action over the others for several reasons but the action strength was the main one. The chamber was just way too oversized in 308 and I was only getting a max of 3 reloads at 300 Sav velocities before the cases would die.

Another was...I couldn't decide what other cartridge to do, having at least one rifle in practically all the other "SA" calibers, and I've been wanting to do a 375 JDJ for a long time. I finished up the 375 H&H, the other "long time dream" and needed a relative quick project to get my mind of other matters.

Thanks also for the load info. The numbers I used were basically from 15" 375 JDJ data for TC pistols and is nothing more than rough guesses. The rifle will tell me what it feels is enough and pressure is my limiting factor.

While there may be a fair amount more energy when talking about a heavy bullet at 100 f/s more velocity, I'm way past "magnumitis" at my age. Bullet placement, I think, is the more important consideration.

I was leaning toward BLC-2 or AA2520 with a Barnes 270 TSX. BLC-2 is one of my favorite powders giving higher velo with lower pressures in certain applications, but many factors will play in this scenario.

Doesn't seem to be much interest in using the Lee Enfield actions nowdays. Just too much competition to deal with something so crude in this contry, even though it is an excellent choice for a knockaround.

Enjoy
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Old 06-24-2007, 03:44 PM
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The above loads are with a Hornady 270 gr. SP. If you are going to load the Barnes 270 gr. TSX, reduce max power charge to 53 grains to obtain the same 58K-60K pressure. The all-copper Barnes bullet is longer, requires a deeper seating depth, and has a longer bearing surface. These result in increased chamber pressure for a given amount of powder. I am probably not telling you anything that you already don't know. Just thought that I would mention it.

Here are some loads with the Barnes 270 gr TSX FB and your two favorite powders:

53.2 gr AA2520, 95% LD, 2254 fps, 3048 fpe.

56.0 gr BL-C2, 100% LD, 2253 fps 3046 fpe.

Have you considered the 375 Steyr?
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