Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics


Reply

Thinking of re-chambering my .30-.378....looking for more velocity

 
LinkBack Thread Tools Display Modes
  #1  
Old 01-10-2008, 10:54 AM
Silver Member
 
Join Date: Sep 2005
Location: Kalifornicated
Posts: 338
Thinking of re-chambering my .30-.378....looking for more velocity

I built a .30-.378 on a Hall single shot action, 34 in. Pac-nor 3/3 barrel. I have not fired it yet and have not bought any brass for it. I am considering re-chambering it to a hotter .30 cal, .300 Phoenix, .300-.416 improved, etc. Basically I am looking for advise and maybe some experience with the even bigger .30 cals. In a set up like mine how much velocity is going to be gained in something like a 220-240 gr. bullet. How available are dies for the bigger cartridges, etc.

Thanks,
John
__________________
USMC Scout Sniper 88-94
Instructor 1st. Mar. Div. SS school 91-94
Reply With Quote
  #2  
Old 01-10-2008, 11:17 AM
Gold Member
 
Join Date: Aug 2007
Location: Bull Mtns MT
Posts: 593
Quote:
Originally Posted by Marine sniper View Post
I built a .30-.378 on a Hall single shot action, 34 in. Pac-nor 3/3 barrel. I have not fired it yet and have not bought any brass for it. I am considering re-chambering it to a hotter .30 cal, .300 Phoenix, .300-.416 improved, etc. Basically I am looking for advise and maybe some experience with the even bigger .30 cals. In a set up like mine how much velocity is going to be gained in something like a 220-240 gr. bullet. How available are dies for the bigger cartridges, etc.

Thanks,
John
I'd leave the 30-378 as is. Get a 338 if you want to shoot heavier bullets. The 378 case is pushing that bullet rather well , but at the expense of powder and barrels. Stepping up further into a 416 case would exaggerate that even worse.
__________________
I'd Rather Make a Slow Hit Than a Fast Miss!

Reply With Quote
  #3  
Old 01-10-2008, 02:48 PM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 5,421
Quote:
Originally Posted by gamedog View Post
I'd leave the 30-378 as is. Get a 338 if you want to shoot heavier bullets. The 378 case is pushing that bullet rather well , but at the expense of powder and barrels. Stepping up further into a 416 case would exaggerate that even worse.
John

I have to go along with Gamedog. I have both ( A 30/378 and a 338) and
they each have there purpose.

The 30/378 is very fast with a 200gr bullet out of a 27" tube and the 338
shoots the 250gr AB and the 300gr SMK very well.

My 200gr load for the 30/378 pushes it 3273ft/sec and groups .091 5 shots
@ 100yrds with 114 grs of 50 BMG.

With 7 more inches of tube you should gain 150 to 200ft/sec more. And
with 126 to 132grs capicity the potential is there for the 225gr and the
250gr bullets.

At one time powders were to fast for the 30/370 and even though there
are slower powders now it's hard to utilize the case to its fullest,So going
to a bigger case does'nt gain you much. and barrel throat life is very short
(Arround 200rds some erosion has already started.

I was going to blow out the shoulders to 40o for more case capicity
but changed my mind after loading for it.

Try it first and I dont think you will be disapointed, The brass even though
it is expensive it is still cheaper than custom brass.

J E CUSTOM
__________________
"PRESS ON"
Reply With Quote
  #4  
Old 01-10-2008, 03:04 PM
Official LRH Sponsor
 
Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,796
I would be very suprised if you would get any more velocity from any of the 30 cal wildcats based on the 416 Rigby case. The reason is because they are very similiar in case capacity to the 30-378 and in most cases, the Rigby cases are not designed to handle high pressure loads as they are designed for a load that drives a 400 gr 416 cal bullet to 2400 fps and thats it, this is with very mild pressure. Sure you can jump the pressure up but your case life will decrease dramatically.

My 300 Allen Xpress is based on the 338 Lapua case. This capacity is actually quite a bit smaller then the 30-378 but I am getting some truely impressive performance out of it for one reason, the Lapua case will take dramatically more pressure then the Wby case and still have a good case life. In my 30" 300 AX, I started testing with the 208 gr A-Max and settled on a load that is producing 3420 fps. Yes, this is a high pressure load but bolt lift is effortless, extraction is great, no ejector mark on case head, no primer loosening and this by the way is not the highest load I tested. She pushed near 3500 fps before I decided that was enough. Just started to feel the primer pockets loosening and a bit of bolt resistance on that those loads.

My point being, you do not have to go with a larger case all the time, the 300 AX has about 10 grains less volume then the rounds your talking about but it has a huge advantage in case strength and quality for that matter.

In addition to that, cases are less costly then the Wby cases.

Before you do anything however, shooting your 30-378 to see how it does is the smart thing to do. It may suprise you and you may well be happy with that level of performance and a factory chambering is much easier to deal with.

Kirby Allen(50)
__________________
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
Reply With Quote
  #5  
Old 01-10-2008, 03:05 PM
Silver Member
 
Join Date: Sep 2005
Location: Kalifornicated
Posts: 338
Thanks guys, bug holes at 100 yards !! sweet ! I plan on trying 220 and 240 Sierras and 210 Berger's. Not sure if the Berger's will hold up to the velocity. The last time I spoke to Berger about it was about 10 year ago when I built a .30-.378 for a buddy and at that time they did not like th e210's going that fast. The rifle has a 10 twist.

JE, can you give me a few pointers on primers and powders. I assume Fed 215's but I have been out of the game a few years and some of the new powders are a little foreign to me. Any other bullets you might suggest?

Thanks,
John

You answered as I was typing, thanks Kirby for your input as well. I emailed you directly this morning. Later this year, or perhaps early next year we will talk about your .338 Allen.
__________________
USMC Scout Sniper 88-94
Instructor 1st. Mar. Div. SS school 91-94
Reply With Quote
  #6  
Old 01-10-2008, 10:55 PM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 5,421
30/378

John

The primers that get the most velocity are the Fed 215s.

The best standard deviation has been with the Rem 9 1/2 mag
primers(5) but at a loss of about 30 ft/sec.

As far as powders the slower the better ( H869, H50BMG) except
H870 I did'nt have any luck with it.

Premium Bullets in the 200gr to 225gr range (Nosler partition in 200gr
& 225 or 200gr accubonds would be my recommendation.

The real trick to building a Weatherby that shoots is minimum head
space (.001 or less) and with the standard Weatherby freebore you
can load hard for velocity,

Please let us know what velocity and performance you get with that
long barrel.

Good luck
J E CUSTOM
__________________
"PRESS ON"
Reply With Quote
  #7  
Old 01-11-2008, 10:47 AM
Silver Member
 
Join Date: Sep 2005
Location: Kalifornicated
Posts: 338
Thanks for the help, I will let you guys know how the rifle does.
__________________
USMC Scout Sniper 88-94
Instructor 1st. Mar. Div. SS school 91-94
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Thinking of re-chambering my .30-.378....looking for more velocity
Thread Thread Starter Forum Replies Last Post
Thinking of 7mm RUM? Andy W Rifles, Bullets, Barrels and Ballistics 22 02-23-2011 01:38 PM
am i thinking too much of the .308 foreign The Basics, Starting Out 32 07-08-2009 06:30 PM
Thinking about a 264 Win mag nite owl Rifles, Bullets, Barrels and Ballistics 5 04-27-2008 01:20 AM
I'm thinking about getting a dog. 4ked Horn General Discussion 28 02-01-2005 01:45 AM
Hi DC: You got me thinking again demarpaint Rifles, Bullets, Barrels and Ballistics 1 03-11-2003 03:27 PM

Current Poll
How Many Different Cartridges Do You Reload For?
ZERO, all factory ammo - 8.04%
359 Votes
1 - 2.78%
124 Votes
2 or 3 - 14.60%
652 Votes
4 or 5 - 20.38%
910 Votes
6 or 7 - 14.87%
664 Votes
8 or 9 - 8.65%
386 Votes
10 or more - 30.68%
1,370 Vote
Total Votes: 4,465
You may not vote on this poll.

All times are GMT -5. The time now is 11:48 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC