311413 in the 300 Blackout??

[xringshutr]

Anyone tried the Lyman 311413 in the 300 BLK?? Success/Failure stories?? Loads?? With the spitzer design is should feed well and the 300 BLK doesn't push anything too hard, speed wise. About the only drawback I can see would be twist rate, which everyone deals with with the 300 BLK. I did a search and didn't see anyone talking about it, so I thought I would start a thread and see where it goes. I have a couple older 311413 single cavity molds and one throws a .314 with COWW, the other about .312 with the same alloy. I plan on trying the .312 mold. Thanks in advance!

[MtGun44]

The 413 is a good boolit at 1700 fps, but I have not felt the need to push it harder - in other
.30 cal cartridges, not the BLK.
Reports are that accy falls apart somewhere above that. Since the BLK won't push a 170 gr a whole
heck of a lot faster than that, if at all, you may be onto a good match.

Bill

[xringshutr]

That's kinda what I was thinking too. The diminutive 300 BLK shouldn't push that 170 gr bullet much beyond it's best performing velocities and it should feed well too. I'll load a few up and see what happens. In the meantime, if anyone else has experience, let me know. Thanks again!!

[madsenshooter]

What twist are we talking about with the BLK? I know my Belding & Mull version of the 413 likes about 1600fps tops, for best accuracy out of the 1/10 rifles I shoot it from. But when it's at or a bit below that speed, shooting golf balls at 100yd and hitting them pretty regularly is the norm. I don't know if more spin would make it better or worse as I haven't yet figured out just why the bullet doesn't like to go faster. Harder alloys and slower powders don't seem to help any. The rpm at 1600fps out of a 1/10 barrel is 115200. That could help you determine what speed to first try for with your twist. RPM=MV* 720/twist rate (in inches). So, 115200=X*720/7, X would equal 1120fps which should be easy enough for you to get without too much pressure.

[MtGun44]

Let me clarify. At an ESTIMATED 1700 fps. Have not chronoed, so it could easily be 1600 fps.

Bill

[xringshutr]

Actually, I was hoping to get a 1-8" twist in the 300 BLK, but ended up with a 1-7". So that's why I'm hoping I don't spin it too fast. We'll find out if they like that tighter twist rate. I'm thinking of trying something in the neighborhood of 15-1600 fps. What do you guys think about powder choice? 2400?? 4227? AA1680? I got quite a few choices, so open the gates on recommendations.

[Hamish]

This looks a tad intersting:

http://castboolits.gunloads.com/show...yman-311413-HP

[xringshutr]

Ooooh. Yes it does look interesting. I think one of mine might be a candidate for HP'ing. Eric does awesome work. I got a HP pin from him a couple years ago for an old Ideal 358439 and had him fix up a 429215 that was struggling. Both work awesome now. Thanks for the idea!!

[Hamish]

I will be looking forward to hearing how the 413 does, I'm thinking of building a BLK myself.

[madsenshooter]

I'd go with as slow a powder as you can, to keep the pressure down, maybe something even slower than what you'd normally consider for the round. 12.6gr of 2015 or similar burn rate powder would yield around 1050fps. 18.8gr of the same burn rate powder would get you in the 1600-1700fps range. 8.0gr of 2400 would give you around 1068fps, I don't know where you'd get by working up from there. I really don't think it's going to like being spun faster than what I figured above. I think that'll be your best accuracy level. But who knows, give it a spin and report back, we might learn something from it. I've shot 6mm bullets in a quicker twist than what was supposed to work at the velocities I was going, but I was using a very hard alloy.

[MtGun44]

2400 would be where I started.

Bill

[xringshutr]

Well, I should have the opportunity to play with it a little this weekend. I'll go with some test loads using2400 and some slower stuff as well. I'll let you all know how it goes.

[Moonie]

H110/W296 is what I use for supers in 300 BO.