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So awhile back I posted trying to find a cartridge setup for a lightweight walk about rifle round. Like the idea of the 30 badger but wanted a little more power. Decided on running a piece of 357 mag brass through a 300 blackout die. What would you call this little booger? Obviously a rimmed 300 blackout but just wondering if there is a name specifically for this setup. Also what twist would you use? Not looking for suppressed. 110-170grain is the planAttachment 322040
I was just thinking about that my goodness!
So I've got this big bucket of 38 Special brass, then my eyes diverted to the 300 Blackout resizing die and then I started rubbing my two brain cells together... I wonder how well that would work with 225 grain Spire point bullets
The 30 badger is wonderful with the 38 special. I don’t know how it would work with the 300 blackout die. Interesting thought. I used magnum brass on thisnone
300 BO is based on the 221 Fireball/223 Remington case dimensions, and the base diameter is smaller than 38/357.
The 300BO sizing die supplied by Lee has been reported to be over-size (lots of chatter on the 300 BO threads about cases formed in Lee dies not fitting the chamber). I took a Lee 300 BO die and "dressed" the area of the die below the shoulder so that it would fit a 357 case. Was easy: split the end of a dowel that was slightly smaller than the die, inserted emery cloth and chucked this in a cordless drill, set on low speed. The task of opening up the die body took about 5 minutes of careful honing. One can do a finish polishing with a linen swatch in place of the emery cloth and jeweler's rouge.
This die makes a really pretty case. I use it for making 38 sp shot shells, using 357 Max cases. However, If I EVER get another Martini Cadet, I am contemplating doing what the OP has in mind: a 30/357.
A tad bit of research came up with something similar: 30 Bobcat.
Been around since the 50’s in various forms.
30 picra is the latest
30 aet
30 Bobcat.
If Bertram will sell 222rimmed cases not necked down ,then you can easily have a rimmed 30 blackout.........the chamber easily made by lathe turning a rim recess to suit.
Run a 357 max. into a 300 BO die backed off a bit. Kind of like a short 30 Apache (1.610 vs 1.76 inches long)
30 Paxton, 30-357 Paxton or 30 Bobcat is what I have heard it called in the past. More recently I have heard it called 300 Blackout Rimmed or 300AAC Rimmed.
I don’t remember, but Hornady used to sell brass.
The .30-357 has been around for a long time now. It was once a very popular silhouette cartridge, and does quite well on steel, especially with heavier .357 bullets.
What twist rate would you use on a 16in barrel 125-170grains?
I did some measurements when I ran .223 brass into a 256 Winchester magnum die because the rimless round has a higher base I measured a 5% lower case capacity . Probably get a slight increase going to your rimmed round from rimless .
I would like to see someone come out with a .25 caliber pistol round based on the rimless case using .350 legend solves the slight .002" case difference at the base . I do not want the new round I would just like some effective bullets for my 10" Contender .256 WM !
Very Similar to the .30 Reece cartridge also. The Reece is based on a slightly shortened .357 magnum case.
1:10Quote:
Originally Posted by cumminsnut76
1:12 inch twist would handle subs and high velocity my 30-30 does
1:14 pre loved match barrel might be nice
If you put a truck axle on it and a perch belly stock. A half a Hubble telescope you could use it for pb cast bullet match shooting. They use a 30-20 case or 32miller short which is similar as far as I can tell.