Can you modify .30-06 brass to make 7.7mm Jap out of it? Is it cost effective to do so?
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Can you modify .30-06 brass to make 7.7mm Jap out of it? Is it cost effective to do so?
Why, yes! Yes you can!
Not so cost effective as long as Hornady brass is available, but its long been the easiest way to get good brass.
Just remember to anneal the case necks after forming or they will tend to split over time.
I prefer to use 8mm mauser cases then you don't have to trim so much brass, but either can be used. I've done both.
This rifle turned out to have been sporterized, but I bought it anyway for a tinkering project. What about just having the rifle converted to .30-06? I've got a few thousand '06 rounds and cases.
Hello guys,
Just reading the post here and associated replys. I thought I heard Hornady made 7.7 brass, as jmoore mentions, but have not found any for sale anywhere. Does anyone know where to get it?
FWIW, I have seen that Privi Partizan makes 7.7 Jap brass too.
Try Grafs and Sons, link below;Quote:
Originally Posted by stripper clip
Graf Sons - The Reloading Authority
Rondog,
Please don't chamber to 30-06! It probably won't shoot worth a darn after its done unless you reload it w/ larger than 0.308" bullets anyways.
What size are the 7.7mm bullets? Are they .311-.312 like the Mosin and Enfield?Quote:
Originally Posted by jmoore
They could be .310-.311, but it really is not a guarantee; some difference in bore diameters has been seen in the past, and one never knows for sure without slugging the bore.
Hmmm, new 7.7x58 brass is kinda pricey! Since I have 4 gallons of .30-06 brass already, can anybody point me towards a good tutorial about how to cut them down to 7.7? I already have a trimmer, just don't know what all's involved.
rondog,
Go to surplusrifle.com, and look at the subsections along the left side of the main page. You will see Type 99 Arisaka listed there. Pull it up; along the right side of that page there are articles about shooting the Type 99 that describe modifying .30-06 and 8MM Mauser brass to 7.7 Japanese. They also describe how to slug the bore, just in case you're interested in doing that.
I slugged mine just last week by using their tutorial; the barrel on mine mic'd at .313.
It's very easy. Lube sparingly (castor oil is good), run the '06 case into a 7.7 Arisaka FL sizer, trim to length, deburr.
https://www.milsurps.com/images/impo...8forming-1.jpg
Using 8x57 cases can be problematical, since they're a little short in both total and head/shoulder dimensions. Normally, the tiny secondary shoulder left then the 8mm neck is reduced provides adequate headspace support for fire forming - but it's advisable to check end-play before firing normal loads.
https://www.milsurps.com/images/impo...adspacec-1.gif