300 AAC casting

[wyrmzr]

I know this has been asked before, but a lot of the posts on the topic are fairly well aged, and after much browsing, I haven't seen much in the way of final results.
I'm considering casting for the 300 AAC. I know from the forums here that Lee makes a mould for this bullet, but it's a heavy round, so most likely geared toward sub sonic. I also know that some people have had at least some luck with the Lee C312-155-2R. But, how has everyone been doing for overall accuracy, and what powders have been good behind the castings they're using?
I'm having good luck with 125 grain J-words running 17.5 grains of IMR 4227, getting MOA out of the combination, but I'd love to try out some cast, probably PC'd, in this barrel. I'm mostly looking at supersonic, as a suppressor is a ways down the road yet for me, but subsonic data certainly wouldn't hurt.

[rda72927]

I'm been very happy with a Lyman 311041 GC, 15.0 H110 running about 1750fps average.

[runfiverun]

well a bolt gun and a semi-auto are gonna want different loads.
and your AR with a rifle length tube is gonna work differently than one with a pistol length tube.
I have about 7-8 loads and they do well in different applications.
the LEE does real well at slow speed in my 7 twist bolt gun with 3.5 grs of 700-x or 4 grs of red-dot.
the 208gr A-max does super nice on top of 4227 in the AR with the pistol length tube, at just about the same velocity.

[Digital Dan]

What type of gun are you shooting?

[6622729]

What type of gun are you shooting?

Do a little more reading. The Lee C312-155-2R is probably one of the two top cast super boolits and it is mentioned all over the place. It's how I was put on to it and it has worked great for me in a 16" 1:7 AR. The NOE 311414 is probably the other popular boolit for super in an AR.

[Digital Dan]

Do a little more reading. The Lee C312-155-2R is probably one of the two top cast super boolits and it is mentioned all over the place. It's how I was put on to it and it has worked great for me in a 16" 1:7 AR. The NOE 311414 is probably the other popular boolit for super in an AR.

I was speaking to the OP and don't assume he is using an AR.

http://castboolits.gunloads.com/showthread.php?304083-I-was-pleasantly-surprised

[Jeff Michel]

I've been using 311410 (Mihec) with 16 Gr. of RL7. Just sized to .310 lubed with 50/50. Runs 1 to 1.5 at 100 yards. The rifle is a Ruger ranch bolt gun. I've also had good performance with the NOE 129 gr.

[Jayhawkhuntclub]

I use the Lee C312-155-2R in my 300 blackout rifle (AR15). I gas check and size them down to 0.309". It averages 1.75" at 100 yards with H110 and 1.57" w/Reloder 7. It feeds well too. I'm pretty happy with that.

I also shoot the Lee TL309-230-5R. It averages around 4.59" at 100, in the same rifle. Not as happy with that one.:mad:

[6622729]

I was speaking to the OP and don't assume he is using an AR.

Sorry Dan. I answered from my phone and didn't even see the quote. My reply was not aimed at your reply. Lol.

[wyrmzr]

This is for an AR.

[mto7464]

So far with powder coating only the Lee has worked well for me. It casts undersized but that work in my advantage when I powder coat. Any other boolit that I powder coat I have to seat really deep to get then to chamber the function is not as reliable. My rifle is an SBR 8.5 inch with pistol gas system. Waiting on my form 1 for my can

[6622729]

So far with powder coating only the Lee has worked well for me. It casts undersized but that work in my advantage when I powder coat. Any other boolit that I powder coat I have to seat really deep to get then to chamber the function is not as reliable. My rifle is an SBR 8.5 inch with pistol gas system. Waiting on my form 1 for my can

The Lee mold casts undersize? What alloy are you using?

[Digital Dan]

This is for an AR.

For workaday shooting you might look to 50/50 WW/Lino with a gascheck. Subsonic is another beast. Doesn't require particularly hard alloy or a check.

[mto7464]

The Lee mold casts undersize? What alloy are you using?

Yes the Lee mold for the 300 bo casts undersized boolits. I would not use them if I did not PC them. I have used straight Lino and number 2 alloy (well close to it). Prefer the #2 since I do not want to waste the lino and there is no need too use it anyway. The boolit dimesions on that mold are messed up. The front driving band is about .307 and the rear 309, IIRC. Don't have any around to double check. Just do a search and you will find plenty about it. After PCing them I size them to .311 and the front band barely gets hit with the sizer compared to the rear band.
All my loads are subs using 9.2 grains of WC820.

[Tackleberry41]

The Lee mold casts undersize? What alloy are you using?

An undersize Lee is not exactly shocking. I was given some of those Lee 230gr bullets. NONE of them were even close to 309. Yes could have been the caster but eventually luck should produce a decent bullet once in a while.

[mto7464]

An undersize Lee is not exactly shocking. I was given some of those Lee 230gr bullets. NONE of them were even close to 309. Yes could have been the caster but eventually luck should produce a decent bullet once in a while.

Really it"s a poor excuse for a mold. Only by powdercoating is it any good.

[6622729]

Yes the Lee mold for the 300 bo casts undersized boolits. I would not use them if I did not PC them. I have used straight Lino and number 2 alloy (well close to it). Prefer the #2 since I do not want to waste the lino and there is no need too use it anyway. The boolit dimesions on that mold are messed up. The front driving band is about .307 and the rear 309, IIRC. Don't have any around to double check. Just do a search and you will find plenty about it. After PCing them I size them to .311 and the front band barely gets hit with the sizer compared to the rear band.
All my loads are subs using 9.2 grains of WC820.

I'm casting that Lee mold is why I asked. I'm using straight COWW and now 6lbs COWW mixed with 1lb Monotype. I tumble lube and size to .309. These are not undersize in either alloy for me. I wonder if you have a bad mold because I read of almost nothing but success with the Lee C312-155-2R and I echo that success myself.

[mto7464]

I'm casting that Lee mold is why I asked. I'm using straight COWW and now 6lbs COWW mixed with 1lb Monotype. I tumble lube and size to .309. These are not undersize in either alloy for me. I wonder if you have a bad mold because I read of almost nothing but success with the Lee C312-155-2R and I echo that success myself.
You are using a different mold then I am. I am using the TL309-230 mold. The mold you are using was intended for the 7.62x39, and is of course a slightly larger boolit.

[6622729]

You are using a different mold then I am. I am using the TL309-230 mold. The mold you are using was intended for the 7.62x39, and is of course a slightly larger boolit.

OK, I see that now. So much back and forth about the 155 and 230 I lost track.