Originally Posted by NorthernWeatherby
I am building a 338-378 Weatherby Magnum. I am starting with a Nesika round action, I have no experience with Nesika, but have chosen them for a few reasons(if anyone has a thought on this let me know.) I am going to go with a 28 -30" fluted barrel with a 1 in 10 gain twist. I currently have a .300WBY Mag. with a 1 in 10 gain twist with a 28" fluted barrel 1.25" to .8" taper and it shoots very well, I have not pushed it past 500m. I am building the .338 to cover 500m to 1200m.
Can anyone give me advice on these choices. I have been shooting for the better part of 20 years and am accustomed to recoil, the rifle will be heavy and should not be to bad to shoot in the prone position.
Custom .300 Weatherby Magnum
The 338/378 is an awesome round and should do everything you want it to.
I don't know much about the Nesika action but it should be OK.
As to the barrel, 28'' to 30'' will produce good ballistics. I would not flute the barrel
because you will need the weight unless you put a brake on it.
My best piece of advice is to have you or your smith hold the head space to less than
.001 (I set mine .0005 to .0001). solving the free bore issue.
And you should neck size only to improve brass life, even then don't expect more than
3 or 4 firings.
I would look at the 250gr accubond for hunting and the 300gr SMK for targets beyond
Just my 2 cents.
J E CUSTOM