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Old 05-06-2017, 06:56 PM
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Question 7.7x58 Arisaka and 7.65 Argentine

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Hello, I am new to this forum and at the risk of sounding stupid I would like to ask a couple of questions about a 7.7x58 arisaka my dad left me. First a little background : the rifle was shot with factory Norma 7.7 Jap ammo back in the 70's with some accuracy. I recently got the rifle back out tore it down and cleaned and oiled and then I slugged the barrel. It measured .316 with my dial caliper but the slug was tight at the bore and receiver end and little looser in the middle. Now to my questions. I have a bag full of 7.65 Argentine brass and would like to know if it would be safe to use to load for the Arisaka? I know, by what I have read, that the case length of the Arg. is 2.11 and the Arisaka is 2.25-2.27. Second question- will a .312 bullet shoot with any accuracy out of this rifle or to get any accuracy will I have to cast bullets? Thanks for any good advice
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Old 05-06-2017, 08:00 PM
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You can use an Argentine FL die to make 7.7x58 cases out of 30-06 brass but I would not use the shorter case. The short answer is NO.

You can shorten 30-06 brass and then run it into a 7.65 Argentine die only far enough for the bolt to close. That sets the headspace dimension for fire-forming.

--Nonte', "Cartridge Conversions"

There is NO WAY to accurately measure bore diameter with a yard stick or caliper. Go with bullets that are called for.
There is no safe direction to point an unsafe gun.
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Old 05-06-2017, 08:32 PM
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Please don't double post.

I'm moving this to the appropriate forum for you.

Originally Posted by faucettb
Welcome to the forum. Rules are simple, be nice and join in.
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Old 05-07-2017, 05:20 AM
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I agree with JBelk

I have made 7.7x58mm Arisaka cases from .30-06 brass and shot cast bullets without any problems. Brass for the 7.7x58mm is available from Graf & Sons and a few other places and that would be my recommendation. I have rifles in 7.7x58mm and 7.65x53mm and reloading manuals usually call for .311", .312" or .313" diameter bullets (same as a .303 British cartridge). It is a good idea to slug the barrel. The bullets can work, but the cases are another matter. Good luck. All the best...
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Old 05-07-2017, 10:13 AM
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I have made 7.7 brass from 30.06 commercial and LC 30.06 match cases and I was not comfortable with the amount of case swell with the commercial 30.06 but was comfortable with the LC 30.06 match cases.
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Old 05-07-2017, 11:25 AM
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Originally Posted by Humpy View Post
I have made 7.7 brass from 30.06 commercial and LC 30.06 match cases and I was not comfortable with the amount of case swell with the commercial 30.06 but was comfortable with the LC 30.06 match cases.
Read that was real popular when surplus ammo ran out. Also read warnings not to do it.
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Last edited by MontyF; 05-07-2017 at 06:25 PM. Reason: Grammar correction.
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Old 05-08-2017, 05:59 AM
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Thanks for the advise. I will order correct brass from Graf's. Anyone need military brass for 7.65 argentine, I have a few hundred with a very few Norma brass. Good thick brass but most berdan primed. Shoot me some info and I will send it for the price of postage. I don't need it any more as I traded my argentine for 30-06.
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Old 06-22-2017, 06:13 AM
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7.7x58 / 7.65x53

I will try to help a little,

I have three 7.65x53 Argentine's, I slugged all the barrels @ .311", .312", & .313"
only one is an original rifle, the others are Argentine barrels put into other actions.

the original is .313" and I shoot .313" jacketed Speer 180 grn and .314" 200 grn cast in it, 1" groups @ 50 yds & 3" groups @ 100 (iron sights).

#2 is a Brazilian 1908 with Argy barrel @ .312" it loves Hornady .312" 150 grn & 174 grn and Speer .313" 180 grn all are 2"or less @ 100 yds (scoped)

#3 is a Yugoslavian M24/47 with Argy barrel @ .311" it loves Speer & Remington .311" 180 grn RN bullets and at times will shoot 3/4" @ 100 yds when I do my part. I have also shot Sierra and Speer 150's and accuracy is pretty good but the heavier bullets have worked better, this rifle also scoped.

Of course 7.65x53 brass it too short for 7.7 x58 Jap, but as stated above can be made from 06, however the PPU (Prvi Partizan) brass from Grafs is all I use in my 7x57, 7.65x53, and 8x57 reloads for several years now, Good Stuff !!

My recommendation would be .312" or .313" jacketed bullets or .313"-.314" cast to see how it performs, if not good step up to .315"-.316" cast.

hope that helped !!
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