Designing a 300 Blackout boolit

[Elkins45]

I'm trying to design a plain based boolet for the 300 Blackout that will shoot well in a 1/8 twist AR barrel. I'm probably going to order it from Mountain Molds so I've been playing around with his online design program and have come up with a couple of drawings. One looks a bit like a Lee design with a bore riding nose and the other is more like a Loverin design with lots of bearing surface. Both are 200 grains, which is the heaviest weight that will fit in his brass blocks.

I would like some input on which (if either) might potentially be a better choice for this particular use. All comments welcome, since I've never designed a bullet before.

http://i292.photobucket.com/albums/mm35/elkins_pix/cd170a1d.jpg

http://i292.photobucket.com/albums/mm35/elkins_pix/bdbfc0e9.jpg

[sargenv]

There was a 247 gr bullet mold made by NOE. It came in either flat base or Gas Check. It had a nice long pointed profile. You may want to check in the "group buy" portion of the forum. It was made for the Whisper/Blackout cartridge.. You could get it in anything from 1-5 cavities..

[Idaho Sharpshooter]

311247 is getting ready for a re-run. Check with Swede.

He is also doing two others in your basic shape/weight area.

[Elkins45]

Thanks, but I don't want a bullet that heavy and I don't want to wait until the fall for the others.

[sargenv]

If that's the case, then any of the avialable .30 cal bullets should work.. I know that there are 30 cal bullet molds from 100 gr up to 220 gr, why re-invent the wheel?

[Elkins45]

If that's the case, then any of the avialable .30 cal bullets should work.. I know that there are 30 cal bullet molds from 100 gr up to 220 gr, why re-invent the wheel?

There isn't a plain based mold on the market from any of the major players, and none of them offer brass molds even if they did have a PB design.

[Jailer]

There isn't a plain based mold on the market from any of the major players, and none of them offer brass molds even if they did have a PB design.

Accurate Molds can make what you want and they offer molds in brass as well. Find the design you want and have Tom give it a plain base. A 311299 would be a good choice for this.

Email Tom he'll take care of you.

http://www.accuratemolds.com/

[Moonie]

+1 for Tom, I have his version of the 245gr 30 cal boolit I use in my 300 AAC Blackout.

[ScorpioMk]

I emailed accurate about a 220gr mold thats plain based, I'll let you know what he says but I'd be buying it in 4 cav brass. I'd love to get a mold that looks like the 311365 but a heavier boolit. I know it shouldnt matter but I hate the look of those 245gr/247gr pigs. I want something to replace the 220gr smk's that a just too expensive to want to shoot a lot of.


These are the 311365, just needs a little more weight and a plain base to be perfect.

http://i69.photobucket.com/albums/i80/swedenelson/311365198GrSP001-1.jpg

[Jailer]

Thanks, but I don't want a bullet that heavy and I don't want to wait until the fall for the others.

Accurate already has a couple designs in the catalog that look like they would work well and are lighter than the 245gr. They both will seat to the bottom of the first driving band without exposing the lube grooves to the powder and will be within AR mag length.

This one is a 175gr gas checked design but all you'd have do is email Tom and tell him you'd like it with a plain base. It's listed as the 31-175R.

http://i19.photobucket.com/albums/b180/Jailer/Gun%20stuff/31-175R-D.png

This one is a 200gr and looks like it was designed for the 300 whisper. It's listed as the 31-200-F.

http://i19.photobucket.com/albums/b180/Jailer/Gun%20stuff/31-200F-D.png

[StratsMan]

Elkin,

Others have recommended Accurate Molds, and are dead on with that.... he can create the mold of your dreams, but his production process requires a minimum .180" flat meplat. I really like pointy boolits for their looks, too.... but they are more difficult for accuracy because you loose bore ride length. My 300 Blackout design at AccurateMolds is 31-235B. It has about 60% bore contact area, and gets good accuracy at just under sub-sonic velocity with a 1x8 twist.

I started using the tool at MountainMolds, too.... couldn't get what I wanted, so I switched to Accurate... found one close, then emailed Tom with my design changes based on an existing design. He catalogued it the next day, I ordered it in the configuration I wanted the mold, and had it in less than a week. Doesn't get much easier than that... One recommendation; I didn't account for material shrink after casting... you may want to order .001" over... so, if you want .309" bands, order .310"... bore ride .300"??? Order .301"...


Scorpio, why do you "need" a pointy boolit? If your intent is super-sonic and longer distances, then you can use other calibers, too... but if your intent is sub-sonic, then the heavy boolits are hard to beat... and the flat meplat increases wound channel and one-shot stops... check with the guys using cast boolits for hog hunting... 30-30's and 300 BLK with flat meplats, from fairly short range, are definite stoppers.....

But if you like the shape of an Ideal 308329, I have a beautiful mold I'll sell... same point as a -365, but one less groove...

[41 mag fan]

Using the 300 blk as an example, shooting sub sonic like I'm wanting to, can you effectively shoot casts thru a suppressor?

[StratsMan]

Using the 300 blk as an example, shooting sub sonic like I'm wanting to, can you effectively shoot casts thru a suppressor?

I've heard guys say that's not good, as the wax builds up or a gas check can come off and damage the can... I don't have one, so I have no experience with them...

But I'd sure like to know what the real issues are with cast-in-cans.....

[wlc]

Using the 300 blk as an example, shooting sub sonic like I'm wanting to, can you effectively shoot casts thru a suppressor?

Its best to have a user serviceable can if you are gonna shoot cast through it. The Liberty Mystic is a fine example of a great can for the BLK (and several other cal.s) if you plan on shooting cast boolits through it.

[41 mag fan]

I should of asked the AAC booth at the NRA convention about shooting cast at sub level and being able to to switch to subs and super sonics without a hiccup.

[RugerFan]

I've heard guys say that's not good, as the wax builds up or a gas check can come off and damage the can... I don't have one, so I have no experience with them...

But I'd sure like to know what the real issues are with cast-in-cans.....

No need to use gas checks at sub-sonic velocities.

[crabo]

I hope you keep this thread going as you progress. I have a little twitch for the 300 Blackout since I have an empty lower setting around.

[Jailer]

Well crabo if you're in the market for a barrel Palmetto has their 300 blk barrels and uppers in stock. The barrels are made by FN and are getting good comments from the users at 300blktalk.

I just finished my Savage Axis barrel swap with a BFG 300 blk barrel and it shoots fantastic.

[white eagle]

either mold maker is top shelf
what is good about Dan's is you get what you designed
although Tom delivers the same