300 BLK subsonic mould for PC

Ian

Ian

Notorious member
I finally reached my frustration limit with lack of a decent subsonic bullet design so it was time to take a stab at it myself. Everyone else has and missed the mark in one way or another, especially when it comes to powder coating the bullets for AR-15s. Accurate is my maker of choice but he can't do the nose point that I need so I'll finish that part myself.

Here's the drawing, I ordered one today.

Bullet Design Catalog | Accurate Molds

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The case mouth will crimp in the second groove. After .001" coating thickness they should be able to be shot without resizing and will move about .100" before tje nose and front shoulder tighten up in the throat. The Lee bullets I'm shooting now do pretty well actually and move about .150" before touching anything and the noses are .299" at the largest point, so this should improve that considerably. I'm convinced that my yawing problem is due to the noses falling to one side of the bore and wobbling their way downrange. The gas check shank is an option but mainly just there to give a cleaner base edge than a boat tail does or a plain base does when peened from ASBB coating and stood on their bases to bake.
 
Spindrift

Spindrift

Well-Known Member
I like it!
It might also work well with PC in your new Tikka 30-06, with full-power loads. Now, that would more or less maximize the terminal ballistic output with cast in the 30-06.
 
RBHarter

RBHarter

West Central AR
I have the NOE version . Haven't shot it yet but I have a Special order 06' that it should shoot in . The 220-225 gr 06' data is really terrifying after the experience with a 2000 fps 250 in the 45-70 there's no appeal in a 230 at 2400 fps . The NOE version needs only 1700 to deliver 1000 ftlb at 1000 .......
In my experience that's about the upper reach of a soft enough to expand bullet in 1-8.5 .
 
P

popper

Well-Known Member
I really like the 170ish PB RD in my pistol @ 850 fps. But I've run it up to 1400 and still good. Need to try it in the carbine for 100 accuracy. Got a 185gr GC version to try too, should get into 1600 fps range before pressure gets too high.
 
R

Randominator

New Member
I have the NOE version of that mold that drops a 247 grain bullet. Accuracy is great powder coated and it feeds in every Blackout I have.

My go to mold for 300 Blackout subs is the NOE 310-225. It feeds in both my Blackout AR's with no issues and yields 1/2" groups at 50 yards in both AR's and a Howa bolt gun.

MwCd47Gm.jpg
 
Ian

Ian

Notorious member
That's the first report I've read on the 310-225. I barged in to the discussion leading up to its development but my recommendation on nose angle was lost in translation. There were many other things that needed fixing like the gas check shank, forward nose diameter/taper, and microbands so there was somewhere to crimp. I never could convince them to make it .308" diameter, either.

The 247 wouldn't chamber in any of my three ARs or either of my neighbors' because the nose comes out at 302" even with weak alloy. No good. The NOE copy of the ACE copy of the Lee 230 is too fat on the ogive to chamber in most Blackouts unless seated excessively deep. If powder-coated, fuggitaboutit. The Lee bullet is just too small on the front, a feature of tool flex I assume.

Anyway, glad to hear it worked for you. I'm particularly interested in how groups hold up at 200 yards, if the holes are round or elliptical, and how much you are sizing them down after coating.
 
R

Randominator

New Member
I size all cast bullets in 300 Blackout to 310”. OAL is 2.070” with this bullet.
I’ve shot paper targets to 200 yards and got clean holes. I can consistently hit a 8” plate at 250 yards with my Howa bolt gun, but the scope elevation is maxed out.
 
Ian

Ian

Notorious member
They jam fit when seated out one more crimp groove but free-fall when seated to the second groove where intended for the BLK. The exposed crimp groove is for displacement to reduce engraving force and crimping in the second groove gives the bullet a .100" run at the throat. I still intend to point these somewhat and/or try some as hollow points with a softer alloy but for now I'm going to try them like they are. The noses don't get beaten up as badly as I anticipated with the .180" meplat and they feed like poop through a goose.

20201013_220741.jpg
 
Ian

Ian

Notorious member
Well, no. Sort of. They shoot ok but consistently jam under fire. I'm going to point the noses next and see if that helps. If not I'll have to skinny-up the nose.

20201017_165555.jpg
 
P

popper

Well-Known Member
Forward mag lip is pivot point. Nose goes up the feed ramp, pivot lip forces BACK of case down so it slips off the bolt lug. Longer ogive helps as nose gets into chamber earlier. Seating deeper may help. Similar problem when upper case gets pulled forward (my COAL is under 2" for the big flat nose RD) by the last loaded case - nose goes up before case momentum is enough to get into that small hole. When Wilson did the 40WT it was partly because the case neck got bent by heavy bore riding designs.
 
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Ian

Ian

Notorious member
You're right, Popper, had the same problem with my LR-308, but just on one side. A SMALL amount of filing the underside of the feed lips with a half-round file cured it. Had to do every Magoul mag the same way.

Thing is, like you say, the more sleek, pointy bullets don't do this. Had same issue with 311316 flat nose bullets at very short OAL in same mags.

May try Lancer 300 BLK mags and see if that helps.
 
Ian

Ian

Notorious member
so these are becoming unstable at 100 yards in the 10" twist rifles (subsonic) so I took five bullets and drilled 37 grains out of the noses, then loaded them up and fired them tonight. Still unstable at 100 yards. Neck tension screwed me up and two went supersonic so tje group sucked but point is still too long for the 10" twist rifles.
 
Ian

Ian

Notorious member
20201024_194903.jpg

Shot this one into my trap where it traversed 3.5' of lightly oiled sawdust and 12" of crumb rubber, three sheets of heavy paper, two layers of cardboard, and bounced off the 2x12 at the back of the trap....all with absolutely ZERO expansion of the .175X 5/8" deep hollow point. Grrrr.

20201024_202432.jpg

At least I proved the Warren Commission was right.
 
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