Heavy 30 Cal ???

[TCTex]

I have multiple TC barrels in 30 caliber with a “1 : 10” twist. Mainly thinking and deliberating with my 16.5in 308 Win in mind, what is the heaviest cast bullet one can shoot in it and still stabilize? I know just enough to scratch my head. I have a 16.5 Whisper barrel that has the standard 1 : 10 twist and everything I have read has told me that it will just not be able to shoot the big boys. I have been told by TC I “can” shoot up to a 200gr without a problem. I got a wild hair and called SSK, because of the 300 Whisper barrel, and they said I “could” shoot a 180gr, however, I got the impression that I should hold my breath… So, with all that Bla Bla Bla Bla being said, what do the real shooters know or have experience with shooting heavy 308 cast bullets. I would really like to get my hands on a NOE 311331 208gr RN / HP mold for the 308. However, I don’t want to waste my time and money if I am crippling my self from the start. It would be a great bullet for hunting and general applications. With my “shortgun” barrels, I try to look for a bullet weight around the 2100 – 2200 fps range and then cast and load accordingly. So far I have been rewarded with quite a few pleasant surprises…

Thanks for putting up with me and taking the time to read this… LOL

Duane

[excess650]

A 1-12" twist will shoot 200gr+ boolits, so a 1-10" is no problem. My 311299s are at least 205gr and shoot very well out of 1-10.65" twist, and in the velocity range you're looking for. The longer, heavier 311284 is often used in the 30-06 and 30-40 Krag, so there is no reason to not try that NOE mold.

[zomby woof]

311299
312299
311284

[Wolfer]

You can google Greenhill formula. It was designed around black powder if I'm not mistaken but works pretty good on most guns I think. It's not the weight it's the length and most boolits are short for their weight.

I'm talkin a little over my head here.

[Moonie]

My 30-06 loves my Accurate molds 245 that I got for my 300AAC. Remember it also has to do with velocity, the slower they are moving the more twist they need. In my 30-06 I'm shooting this boolit at 1950fps with 35g H4895, MOA.

[TCTex]

Thanks Gents, that helps a lot!

I looked up the Greenhill formula. I laughed pretty hard when I threw in a couple of combinations from known shooting rigs.

I have four 30cals in short guns and two 30-06 rifles. I think I just need to give it a dance and see what happens.

[Nobade]

Cast boolits will stabilize in slower twists than jacketed since they are much more dense and shorter for a given weight. I shoot that same 247gr. whisper boolit in my 1:10 30-06 and the 1:9.5 7.62x39, both subsonic, with amazingly good accuracy. If you can't get your TC to shoot it well it is not a twist rate problem.

Keep in mind you can shoot up to about 170gr. cast boolits in a 1:14 twist 30 caliber. But if shooting jacketed you'll be limited to about 125-130gr.

[TCTex]

That is VERY good information!! I had already decided to get the NOE mold, that just nailed the lid on the coffin… LOL

[Moonie]

FYI, mine isn't the NOE, its the Accurate, it arrived 4 days after ordering.

[Nrut]

FYI, mine isn't the NOE, its the Accurate, it arrived 4 days after ordering.
Exactly!
Anybody that orders a mold .30 cal. or greater dia. from NOE or MiHec is into self abuse!
Their molds are very good but the wait is loooooooong!!!!
How do I know this?
ha, ha!
I am a slow learner...:shock::veryconfu:shock:

:popcorn::popcorn::popcorn:

[Moonie]

Don't get me wrong, I have both a NOE and a Mihec, I would gladly own another, but it IS a seriously long wait and the Accurate molds are also great molds.

[Shooter6br]

My 1917 American Enfield (original barrel) likes Accurate mold 32-L(Lyman 314299) 200;grain.

[Wayne S]

There were several twist/stability programs listed when the NOE 311-247 BLACKOUT mold was being discussed , do the search thing or google JBM stability

[TCTex]

I didn’t even know that JBM had that program, THANK YOU!

:awesome:

I use JBM all the time for their ballistic software…

:bigsmyl2: