Lee .309 -230 gr in a 300 Win Mag

[LAGS]

I just received my new mold, the Lee 230 gr TL for the 300 Blackout.
I was going to cast some for a friends AR with a Supressor, so he wants to load them Sub Sonic.
But, I want to do some testing with this Boolit in my 300 Win Mag, .308 and 30-06.
What are your thoughts guys.
I plan to start off Sub Sonic, and then work up from there.
I am going to cast them from Linotype or maybe Monotype and ESPC the boolits.
If it works out well and the twist rate is ok to stabilize the boolit, I may buy another mold and Lap it out to .312 for the MN's
I have recently been Lapping molds with Cherries I cast Out Of Zinc.
So far they work great and took my .312 Lee 155 2R Two Cavity that I replaced with the new 6 cavity out to .316, and a Two cavity Lee 125 TL .356 out to .360 for my 38 S&W's and maybe a friends Makorov.
If I dont have use for a mold any more because I replaced it, or something, i modify them into something I need or they do not make.
Maybe the 125 will become a Hollow point mold soon too.

[GooseGestapo]

Probably won't group subsonic. The .300BO has 1/7 or 1/8" twist. The 1/10 or 1/12" twist of .300WinMag likely won't group them.
I tried some light loads in .30/30 with 200gr RNGC. They key-holed bad! 1/12" twist...

try some H4895 at loading for~2,000fps. May group there, but I doubt that TL design W/O gascheck will allow anywhere near those speeds.
The .300winmag isn't the best cast boolit cartridge given the short neck.
You might get the TL 230's to shoot from the .30/06, but not likely at subsonic speeds.
I have used the 200gr RNGC in a friends suppressed.300BO. They shot as well as Hornady 208gr A-Max. The mold cost less than a 50 rd box of Hornady's!

[Moonie]

I've seen people use gas checks on these boolits as they will fit on the boat tail. I've not done it, I gave up on this boolit not long after I got the mold. I had accuracy issues with it, it did feed and function well but was barely accurate enough for a plinker, and I have a couple of other heavy weight molds, both of which have more cavities than this mold.

[LAGS]

I intend to Powdercoat the bullets, so the TL design and leading is not a concern.
I do not intend to shoot them Sub sonic unless that is the only speed which is accurate.
I am going to start of with the .308 win and 30-06 first because of the short neck on the 300 win mag. as you mentioned.
I will try 10.0 gr of Unique and work up from there.
Then I will try Reloader 7 and if the bullet shows promise, then other powders like the 4895

[LAGS]

@ Moonie
What GC will fit a Boat Tail Boolit ?
If the GC seals the bore, then it distroys the effect or advantage of having a BT boolit

[1johnlb]

The Lee 230 shot terribly in my 9inch blkout, 308w, but loaded in one of my k31s and my G1911 Swiss over 7grs titegroup shot great, just as we'll if not better than any design.

[Moonie]

@ Moonie
What GC will fit a Boat Tail Boolit ?
If the GC seals the bore, then it distroys the effect or advantage of having a BT boolit

I didn't do it, I was just reporting what others have done. The effect the BT has is horrible accuracy, and yes, the GC does destroy that effect according to those that have tried it. I had other molds and moved on.

[LAGS]

I loaded up 20 of them with 10.0 and 10.5 gr of Unique in the .308 winchester to try hopefully this weekend.
I have friends coming over for me to repair a scope base on a rifle and buy the bullets from last weekends Score at the scrapyard.
But another friend is coming up to go to the range by my house.
I need to schedule everone so I can make it to the range too.
Plus, I have major all night concrete pouts tonight and Sunday.

[leadman]

I bought this mold when it first came out. It never shot good in my 300 Whisper but I did put a standard 30 caliber GC on the base and shot it in my 30-06. At around 1800 fps it shot decent, but not as well as other more conventional cast boolit designs.

Boolits from this mold need to be cooled more than other designs as the boolit will bend when dropped.

[Tackleberry41]

You will probably have issues w a bullet that long, going that slow in the standard rifling used in 30 cal weapons.

I could get a 200gr, casts at about 210gr, to group well in my mosin at subsonic, really well, 9.5in twist. But terrible groups w same bullet in a 30-30, old Steven bolt gun. Had to drop back to a 170gr to get it to group.

I would imagine the 300win mag is poor candidate for subsonic use. You will need more powder for that huge case. I was running 6.8gr of S1000 in the 30/30 under a 200gr, 8.1 gr in the larger cased mosin w same bullet and speed. And seating it will probably be an issue. Mosin works beautifully, but you can seat them out pretty far, the 30/30 the GC was way below the shoulder to get them to chamber.