Sunday, January 5, 2014

Blowback

Apparently I need to up the pressure in my cast bullet loads for my Type 99. I'm using reformed Remington 8mm Mauser brass, as 7.7 brass was rare when I wanted to load these. There were a number of shots where there was a fair bit of a smokey breeze coming out of the wrong end of the rifle, and a good inch of soot down some of the cartridge case. Think I'll switch the load from IMR 4227 over to Winchester 748; Win 748 runs higher pressures for cast loads at similar velocities, which should form that case to the chamber nicely. Or blow smoke into my face at even higher pressure.
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4 comments:

Emile said...

My dad used to be a reloading master. He taught me the basic steps of reloading the ammo I had shot previously, but I never really knew the ins and outs like he did. That's a good skill to have, especially in this day and age.

January 7, 2014 at 9:41 PM
Larry said...

Looks like the 30-06 was a better fit for the 7.7x58 loads just comparing where the shoulders are. How far did you have to stretch it? Good thing the Arisaka actions are so strong. :D

Mine is a Type 30, 6.5x50, also very expensive dining habits. Fortunately I was able to acquire enough brass for it (that's what got me started on reloading in the first place).

Could be worse, I have a friend that has a .338 Lapua.

January 15, 2014 at 5:16 AM
Murphy's Law said...

I use Win 748 with my cut-down .30-06 brass and HOrnady's .312 174gr. bullets. Excellent results.

http://lagniappeslair.blogspot.com/2011/11/how-to-make-your-own-77-jap-rifle-ammo.html

January 22, 2014 at 4:40 PM
MauserMedic said...

ML,

I think one of the reasons I went with 7.9 over the 30-06 was the amount of trimming involved with reformed cases; the RCBS trimmer I have is manual,and trimming that much excess brass is sloooow.

February 9, 2014 at 5:49 PM

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