Highest BC bullet for a 30-378??

[MMERSS]

I've loaded the 230 Bergers for an Accumark 30-378 with good results and still able to feed them in the magazine. This is where I would start.

 

[MMERSS]

My next big 30 will be a 30-338 LM Imp which will be better yet with a case length of 2.725 with more case volume. It should be a ballistic twin of the 30-378

That should be fun!

 

[MontanaRifleman]

That should be fun!

I'm thinking so

 

[Broz]

Jeff, I did you have to load the 230's all the way to the ogive?
My next big 30 will be a 30-338 LM Imp which will be better yet with a case length of 2.725 with more case volume. It should be a ballistic twin of the 30-378

Yes, they are seated with bullet into the shoulder area, but it was not a problem as the 30-378 always had more case volume than I could ever use.

That 30-338 LMI will be a screamer. I bet you get better velocity than you could with a 30-378.

One of the guys that took my shooting class last spring had a 30-338 LM from MCR. The rifle was very impressive at 1800 yards with 230 Bergers.

Jeff

 

[seidersjoden]

And what was he using on the 1800 yard shot wit the Berger 230's 1-9 or 1-10. I need some good advice on whether to keep the barrel twist a 1-10 or call GAPrecision while I can and change my order to the 1-9?? Any help?

 

[R.Morehouse]

Mark, The 30-378 Accumark will cycle a bullet loaded to an OAL of 3.800" Some will go 3.820" The 230 Berger Hybrid was designed for use in 300 win mag box that is shorter. So, I think feel they are a very good fit in the 30-378. We have shot them in both the 300 win and 30-378 with awesome results, all 1 in 10 twists. The 30-378 with a 230 Berger is a long range hammer and they will expand too.

Jeff

Broz
I am just going to start messing with the 230's here out of my RUM and was wondering what FPS you shoot them out of the WM at and about where are you going transonic and in tran. how do the 230's behave.....Thank's

 

[Broz]

And what was he using on the 1800 yard shot wit the Berger 230's 1-9 or 1-10. I need some good advice on whether to keep the barrel twist a 1-10 or call GAPrecision while I can and change my order to the 1-9?? Any help?

I am pretty sure the 30-338 Lapua was a 1in 10, I know the Accumarks were.

Jeff

 

[Broz]

Broz
I am just going to start messing with the 230's here out of my RUM and was wondering what FPS you shoot them out of the WM at and about where are you going transonic and in tran. how do the 230's behave.....Thank's

Out of my sons 300 win he shoots them at 2775 fps. and it is a 10 twist. Not sure where it goes transonic. I have no data on hand with transonic groups using the 230's. But I have shot the 300 gr 338 Hybrid OTM's transonic many times and they were very impressive.

Jeff

 

[Yrcan]

I shoot the 230 Berger Match HT bullet out of my 300 win mag at 2788 fps, using 75 grs of Viht N570 powder. I have a 1:8 twist. Yesterday I shot at 1755 yards, and the bullets dropped at the rock I was aiming for, with no problems. My coal is 3.740 inches. I have a Tikka T3 Super Varmint, and the mag can not handle the long cartridge I singele feed all my rifles even when hunting, as I try not to stress, and allways ensure that my first shot is good. So far so good

I am going hunting in Scotland in may, using this rifle and bullet, I will let you know how it performs when I return.

 

[MontanaRifleman]

And what was he using on the 1800 yard shot wit the Berger 230's 1-9 or 1-10. I need some good advice on whether to keep the barrel twist a 1-10 or call GAPrecision while I can and change my order to the 1-9?? Any help?

You will probably do OK with the 10 twist especially out of a 30-378. But IMO, a 9 twist would be better, especially if you are at lower elevations. When I input the numbers for a RUM into the Berger twist calc for my worst case of 3000 fps, 3000' elevation and 0* temp with a 10 twist, it comes up with a SF of 1.39 and Berger recommends a 1.5 which is standard for hunting rounds. A 1.1 or better is usually good for paper punching but less than 1.5 can lead to unstable terminal ballistics.

I have read that Tim North from Broughton Barrels is recommending the 9 twist for the 230 Hybrid either from personal experience or customer experience.

http://www.bergerbullets.com/products/target-bullets/

 

[seidersjoden]

OK, Ill have to call GAP and possibly change the twist rate.

 

[seidersjoden]

Thanks for the help guys, if theres any more info regarding this caliber fell free to share.