Heavy cast in 300 Win Mag

[silverjay]

Looking for some feedback on a good heavy cast boolit for a 300 win mag with 1:9 twist barrel. Not looking to push it fast. Was thinking about the NOE 247 grain. Thoughts?

[bhn22]

Are you talking about the 300 Blackout mould? It may have too long of a nose for 300 Win Mag. Its designed not to encroach into the powder space of a shortnecked case. This makes the bore riding nose extra long. It may not fit in your magazine, but you might be able to single load it.

[bowenrd]

Not sure of your definition of heavy. I use a 311284 mold. It is a 210 gr bore rider that works well in my 300 WM at about 2100 fps.

[silverjay]

210 was the light end of what I was thinking.

[Moonie]

I load the accurate molds version of this boolits in my savage edge 30-06 with no issue. Fits the mag perfectly and shoots very well at 1,950fps.

[dh2]

It is not as heavy as what some of you are using, I am using a 180gr. bore rider from Accurate for .308Win. 30-06 and .300 Win.Mag.
I think I will have to push it faster than 2000FPS to get it to preform its best, it is taking a liking to speed

[LAGS]

I am putting together a 300 Win Mag right now and do intend to use it for cast boolits.
The heaviest mold I have now is the NOE 198 GC/PB
I have the NOE 316299 that I could size down, but I too would like to see what the rifle will do with a 230+ boolit.
What powder were you going to use ?

[silverjay]

Red dot, unique, 4064, 4895, .....

[texassako]

I have a plain base mold very similar to the NOE 247 I shoot in a 9.5 twist rifle. It is a tough one to cast, lube, and load. They bend pretty easy if you are not careful, and the PB complicates driving it fast enough to stabilize. The NOE 311331 is a favorite of mine and is pretty heavy at 218gr if the nose will fit your max length.

[LAGS]

@ Silverjay
I am about two weeks out from getting the rifle done.
It is a Savage 110 long action mounted on a Savage Model 12 short action single shot stock with the stock releived for the 3 round blind magazine.
I will keep you posted how it does with the molds that I have now, and with your feedback, I may buy a different mold soon.

[LAGS]

I looked thru all of my manuals tonight, and the heaviest boolits listed in cast for the 300 Win Mag are the 187 and 190.
I can use that data for starting loads for what I have molds for right now, but I guess I will just have to wing it if I get a heavier mold.
I did find data for the 210 gr for the 300 Weatherby and 300 H&H Mags

[silverjay]

I sent NOE an email, will see what he says. I was planning to use Quickload as part of the development.

[silverjay]

Has anyone looked at the Mihec group buy for the 300 AAC for use in a 300?

[MBTcustom]

Just my opinion, I think putting a 1-9 twist barrel on there is going to greatly hinder your speed which is going to leave you with a great deal of unused case capacity. I shoot a lot of 300 WinMag and it's not a pretty picture with cast. My rifle has a 1-10 twist barrel on it and just two weeks ago I tried to shoot some cast bullets out of it at 2300 FPS. It was a total bust. I've got to stay in the 1950 range with that twist.
These stickies explain fully what I am talking about:
http://castboolits.gunloads.com/showthread.php?245302-RPM-Threshold-A-Tale-of-Three-Twists-Chapter-II
http://castboolits.gunloads.com/showthread.php?208186-RPM-Threshold-barrel-twist-velocity-chart
I am a custom gunsmith and my business is building custom cast bullet rifles for the members of this forum and the United States as a whole and I believe the links above to be absolutely true.