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On the twist rate thing, while this is a heavy 30, its not as long as most jacketed boatail bullets 200+ gr.

CRIMANITLLY!! i just realized i could get it with hollow point cav. ill take one hp cav. in my 5-cav please.

Ill take a 5 cav. all plain base please if its not too late.

my 300/221 muzzle is 1/2 36 tpi

we will be offering the 300 blk with a pistol length gas system and 1in8 twist, or carbine length and
1in10 or 1in12

Of course after that long technical post I re-read the title and realized you wanted super-sonic loads.

Still 1680, 4227 though.

nice!!

Hicap

Ill bet 1600-1800fps with a 190gr boolit is doable since the .300 blk is so similar to the 300/221 and Ive hit well over 1700fps with my 300/221 with the lee 200gr.

hi-cap

if all goes well the .358 will be in production in about 6 weeks

Hicard
I am not saying that at all. What I am saying is that the 358 should feed fine so long as you use acceptable bullet contures for semi-autos.

I was trying to answere triggerhappy's...

1680 and h116 works in my ar with the same boolit down to about 900fps. I used some data 68 to but had some un-burnt powder. I am using a carbine length tube adj. gas block. I use a cavalry arms...

the shoulder dia of the .358 cb or dca is approx .428 giving you a step down of .07" to a .358 dia bullet.

the 300/221 has a shoulder dia of approx .369 giving you a step down of .061".

im...

you know 82nd, we could add about .050-.070" length to the neck of the .300-.221 and maybe a looser throat since the standard .300-.221 is so tight. It would be more bore rider friendly and would...

Well we never got a solid agreement on a name yet. The official name will be whatever is decided on this thread.

yeah sorry, I went to school in the ozarks.

1.69" so yes, pretty much right at the shoulder

we could do a .358 auto based on the 10mm mag

The problem with the 204 is the same as with the .223 rem. Not enough tapper for 35 cal. And if you try to fireform the case too close to the base then you destroy your brass. Loose primer pockets,...

we are also thinking about offering a stronger/larger bolt and barrel extension for the
6.8spc
6.5grin
450bm
7.62x39
.358x39
and so on, so you can push it a bit harder. aprox. 20% in most...

the 35x39 would just be designed to feed in an ar rather than an ak like the 9x39.

Less tapper

The good thing about most (50%+) in-experienced, mocho people that are properlly embarassed at the range by someone who clearly knows better will either think things through and learn before...

I was mostly wondering about the bore ride section. I can fix the reamer design to acomidate whatever bullet I want, if I have to. I should have about 1" extra magazine length. The case isnt botle...

its going to be a 10mm mag in a ar-15, with a long oal. Ill be running mostly sub-sonic 950-1050fps.

case length is 1.245-1.255 with about .8" of "neck"

Im thinking of having a mold made for very heavy .401 boolits. Somthing like the
Lyman #410660 40 Caliber (406-410 Diameter) 385 Grain Semi-Pointed but in .401. For my 10mm mag

my options are...

bullshop,

It is about .4" short for the razorback when using bmg bullets, but it would probably work with some .510 hunting bullets. The only problem is, the .338 savage is $2000 before you put a...

the reamer for the sub-sonic mag fed .510 is on its way:bigsmyl2: