Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

338 RUM problems

 
LinkBack Thread Tools Display Modes
  #8  
Old 01-07-2008, 09:09 AM
Gold Member
 
Join Date: Jan 2005
Location: Western MI
Posts: 716
D.Camilleri

I have a M700LSS in 338 RUM with a Leupold VariX III 2.5x8 and get excellent accuracy with several loads.
Here are my favorite loads for the 338 RUM. All loads were taken from the Nosler #5 manual and are safe in MY rifle. I am using R-P cases and Federal GM215M primers. I run all COL's at 3.645".

200 gr Nosler BT
RL22 90.0 grs
best 3 shot group @ 100 yds .325"

210 gr Nosler PT
RL22 90.0 grs
best 4 shot group @ 100 yds .425"
best 3 shot group @ 300 yds 1.285"

225 gr Nosler PT
RL22 90.0 grs
best 3 shot group @ 100 yds .450"

225 gr Nosler AB
RL25 96.0 grs
best 4 shot group @ 100 yds .567"

250 gr Nosler PT
RL25 90.0 grs
best 4 shot group @ 100 yds .490"

Hope this helps.

JD338

Last edited by JD338; 01-07-2008 at 09:15 AM.
Reply With Quote
  #9  
Old 01-07-2008, 10:24 AM
Silver Member
 
Join Date: Dec 2007
Location: WI USA
Posts: 411
This is an interesting thread. I am in the process of trying to decide between a 300RUM and a 338RUM. I really appreciate the info on contour of a bbl and load information. You guys really know your stuff. It is a delight to read your posts.
Reply With Quote
  #10  
Old 01-07-2008, 11:17 AM
Platinum Member
 
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,117
Howdy Fella,

Your situation sounds pretty much like being married to the wrong woman

I took some time to study each of your posts as I'm also shooting a 338 RUM which started life as a 338 Win Mag. The WinMag bbl was replaced w/a REM new take off sporter barrel - 26". It has a Holland QD brake installed along with a Limbsaver recoil pad on the other end.

I Tubbs'd the "new" barrel as part of the break in process.

My first input would be about your statement: "as soon as my shoulder heals up". My rifle weighs in at 10# all up and I'm attempting to shoot the barrel out to get a halfway decent excuse to upgrade to a bigger cartridge. I shoot it prone all afternoon and have no recovery time. What kind of brake are you using??

Next, I can't get anywhere near the velocities you are getting. An inch+ advantage that your barrel has doesn't provide "that" much more velocity.

Considering the excessive copper fouling even after the Tubb's process is something to be considered.

What if the extra velocity, if it is really extra, and excessive copper fouling would it be silly consider a loose bore? What that means I have no idea but it may also make a little sense that it doesn't like boat tails. It's my under standing that flat base bullets and RBBTs seal at the base a bit better at the base upon firing.

If all else fails one last thing to try, which is a bit selfish on my part as you are posting some good stuff.

Have a go with US-869 and 300gr SMKs. Hodgon's says 101 grains is max but I'd look it up first. I got nothing to shoot in my 338 RUM until I got to this combination. Now she's 1/4 MOA @ 200. 2730 +/- 1 fps @ 40* F.

PS: with a Lilja which are tight bores, your pressures will go up and velocity will go down but most certainly the accuracy will be there if all else is in order.
__________________
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!

Last edited by royinidaho; 01-07-2008 at 11:21 AM.
Reply With Quote
  #11  
Old 01-07-2008, 12:00 PM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 5,501
Vertical stringing is normaly caused by inconsistant trigger pull.

Horizontal stringing is caused by barrel/action to stock fit (poor
bedding ,barrel touching stock on one side, loose bedding screws,
or no metal to metal contact between action screws and recever.

As far as the fouling I have had a few barrels that had to be lapped
to save them.

Now I biuld only on select match stainless barrels and have eliminated
this problem and the cost is very little more considering extended
throat life and they are already laped and contoured.

I would try lapping and if this does not improve the accurace then
replace it with a premium stainless barrel and you wont be sorry.

Just my opinion
J E CUSTOM
__________________
"PRESS ON"
Reply With Quote
  #12  
Old 01-11-2008, 05:15 PM
Gold Member
 
Join Date: Jun 2004
Location: Worland, Wyoming
Posts: 575
These are all good ideas and will be followed up on, but I still have a question about about the throat length of a blue printed 338 RUM. I am thinking about having the smith that built this gun make a chamber casting and check the dimensions. When he built it, mine was the first barrel to be done with a new reamer. Maybe the reamer wasn't cut properly. Just talked to a friend with a factory barreled 338 RUM and he can get his bullets within .030 of the lands. I can't get within .090 of the lands and my throat isn't erroded. My factory barrel shot every bullet well before the problems started, this barrel has never shot any bullet well with the exception of the 250 gr partions.

One other thing I am considering is to increase the bedding area in front of the lug, due to the fact that the chamber taper ends at a rather sharp point and changes to barrel contour and in my opinion, if the barrel was going to whip, it would start right at this transition.

I just picked up a lead sled yesterday, so I can quit abusing my body with this shoulder abuser.
__________________
Remington model 700 300 RUM LH 26" rem ss/blued receiver lam stock 215 Berger @3025/180 NAB @3300
Remington model 700 338 RUM LH 27" Broughton 5C 225NAB@3300 /300gr Berger@2830
Savage LH 22-250
Reply With Quote
  #13  
Old 01-13-2008, 02:14 PM
Gold Member
 
Join Date: Jun 2004
Location: Worland, Wyoming
Posts: 575
I measured the chamber yesterday with several different bullets. I think I am zeroing in on a problem. Nosler partitions are much closer to the lands than Nosler Accubonds, but I had no idea the difference would be .400. There is no way I could ever get an accubond close to the lands without single shotting it, which isn't an option in grizzly country. The partions are showing some promise, so I will start playing with the oal to see if I can shrink the group. I also just bought a lead sled so I can take me out of the equation.

I also measured the 250 grain sierra game king and it is within .018 of the 250 grain partition, but with the same powder charge it shot a pattern not a group.

Why doesn't this barrel like boat tails? I am strongly thinking it is time for a different barrel, maybe a Mike Rock. Any thoughts?
__________________
Remington model 700 300 RUM LH 26" rem ss/blued receiver lam stock 215 Berger @3025/180 NAB @3300
Remington model 700 338 RUM LH 27" Broughton 5C 225NAB@3300 /300gr Berger@2830
Savage LH 22-250
Reply With Quote
  #14  
Old 01-14-2008, 11:42 PM
Chawlston
 
Posts: n/a
Quote:
Originally Posted by D.Camilleri View Post
I measured the chamber yesterday with several different bullets. I think I am zeroing in on a problem. Nosler partitions are much closer to the lands than Nosler Accubonds, but I had no idea the difference would be .400. There is no way I could ever get an accubond close to the lands without single shotting it, which isn't an option in grizzly country. The partions are showing some promise, so I will start playing with the oal to see if I can shrink the group. I also just bought a lead sled so I can take me out of the equation.

I also measured the 250 grain sierra game king and it is within .018 of the 250 grain partition, but with the same powder charge it shot a pattern not a group.

Why doesn't this barrel like boat tails? I am strongly thinking it is time for a different barrel, maybe a Mike Rock. Any thoughts?
You have more than one issue:

--barrel turned after final lapping

--gunsmith who did the above probably did the rest of the gun

--the chamer is throated way too far (seen this before)


My recommendation is to get a "new" set of eyes on the project so that something else does not go un-noticed

BTW, we are getting <.375" @ 100 yards and right at 1.2" @ 400 yards with factory Remington guns shooting factory ammo. Factory guns with reloaded ammo will yield significantly less than the above.

Finally, a good mirage shade can always be a good asset when shooting loads to determine recipe loading data. When I forget to put mine on, it is very easy to see it in the grouping at 100 and 400 yards.

Chawslton
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 338 RUM problems
Thread Thread Starter Forum Replies Last Post
.338 win mag problems GermanXJ Rifles, Bullets, Barrels and Ballistics 8 01-16-2011 01:03 PM
Die Problems?? gunaddict62791 Reloading 3 01-07-2011 06:23 PM
Fn SPR mag problems Ian B Rifles, Bullets, Barrels and Ballistics 0 09-21-2010 12:51 AM
300 RUM problems asfornea2 Reloading 6 01-05-2009 11:01 AM
Bad problems poleok Member Introductions 0 09-16-2008 01:44 PM


All times are GMT -5. The time now is 02:28 PM.


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