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Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Michael Eichele, Jun 14, 2005.
Any body have any 1st hand knowledge of barrel life with the 30-378 WBY mag??
I have heard that a gun that shoots consistant 1/2" groups can expect to see accuracy move to the 1" range after 1000 rounds. Not to sure how scientific that test was but that is a seriuosly overbore round.
I know that I start to see accuracy go away after about 1800 rounds out of my 22-250Ai thats with the same load but if I chase the lands out a bit I can get about 2500 rounds thats with a 1-10 twist Pac-Nor and 69gr SMK bullets loaded hot. Thats a pretty overbore round and I'm running those loads stiff so.
I have also heard that some guys are getting 2000+ rounds with the 300RUM and thats pretty close to the 378Wby case
Thanks for the reply. I am currently using a custom 300 RUM. w/a 27.25" bbl and 12x and bullets coated in tungsten disulfied, I am getting 30-378 velocities with the 180 grain bullets. I had been kicking around the idea of screwing around with the 30-378 again just to see how fast I could get it up to with a bbl of similar features.
I sure hope I can get 2000 good rounds out of that 300!! I have almost 800 bucks in the bbl alone.
The 30-378 is a fairly hot chambering and from what I have heard peak accuracy is lost after 800-1000 rounds. Barrel life depends on more factors than just rounds fired. Following a proper cleaning procedure (bore guide) helps to reduce any unecessary wear. Good luck with that Ga-ear-da-shplitten-louden-boomer!!
Will it be shot hot?
What powder do you plan to use?
How often will you clean it?
How will you clean it?
Are you opposed to break in fire-lapping kits?
Can you afford the downtime of rechambering to get into new throat material?
All of these factor into barrel life.
The fact is that the 30-378 is WAY overbore and I am not surprised when I read faster velos on my Oehler when chronoing 300 ultras. The 30-378 is just trying to push too much powder down that 30 cal hole.
If it was my barrel and I were treating it the way I do, and I was expecting accuracy like I do, and was using it for ultra long range shooting the way I do, I would expect no more than 600 rounds of peak accuracy before resorting to other tricks in the bag for "reviving the beast".
Ultimately, the barrel WILL get to the point where it will not shoot the way it used to and at that point you can use a throat maintenance system from David Tubb to smooth out the barrel, and you may have to switch to a different bullet with a more gentle shape and/or move the bullet out to a longer seating depth. Or, you can set your barrel back a thread or two and have it rechambered. I have had to do this reviving many times on my own rifles. One in particular was my 300 win mag. After about 1100 rounds, my accuracy went from 1/4" to 1 1/4". I then went to a longer bearing surface bullet, moved it out closer to the riflings, and worked up the new load accordingly. Accuracy came back and has stayed for awhile, but I know ultimately some day it will need a new barrel. Oh, by the way, I shoot 75.5 grains of Rl22 with a 180 grain Accubond and have 1300 rounds through her now. The 30-378 burns about 20-30 grains more powder so expect at least 30% less throat life.