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308 win and the berger 215

 
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  #29  
Old 10-12-2013, 05:27 PM
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Re: 308 win and the berger 215

3.10" is probably a fairly sensible max, but having said that, I've heard some of the F/TR shooters going out to 3.25", still leaving about .15" of bearing surface in the neck.

Speaking of F/TR, if you look around on some of their forums I'll bet you can find a wealth of additional info and considerations on long-loading the heavies in 308 Win. I've read 32" barrels launching 208s, 210s, 215s up to 2700 fps is fairly routine in those circles.
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  #30  
Old 10-13-2013, 09:21 AM
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Re: 308 win and the berger 215

.15 of a bearing surface doesnt sound like much. I suppose its enough though.

Ive been lurking on some other forums but i havent found any better info than ive found here.

Is it a pain to moly bullets?
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  #31  
Old 10-13-2013, 12:14 PM
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Re: 308 win and the berger 215

I like to have one caliber of bearing surface in the neck myself. But for example, the 300 WinMag case only has a .264" neck, and the 300 Savage only has a .221" neck. So I can't be all that important.

Molying bullets is very easy. I simply dump 200 bullets into a vibratory tumbler, add 1/4 teasponn of moly powder, and let it tumble for an hour or two. That's it.

If you go down that road You will want a dedicated tumbler bowl because it will get 'seasoned' with moly too. Or, you can put (fewer) bullets and moly powder in a vitamin bottle, tape it closed, and toss that in the tumbler. Works well, and your tumbler bowl stays clean.

Also, regarding moly, if you are real anal about a clean-to-the-metal bore, moly is not your gig. If you go with moly, the idea is to leave it in the bore. Some folks go hundreds of rounds without cleaning the bore. i usually clean mine now and then, but just a few passes with bronze brush and Montana Extreme solvent, then patch it out. Mainly I'm just removing any excess carbon from the bore.

If you are shooting a good quality hand-lapped barrel, there may not be much point in moly. I use it in my Rem factory bbl's, and a Douglas barrel. For me it eliminates copper fouling, and grants the ability to shoot as many rounds as I want without accuracy going away. In fact mine seem to shoot better good and dirty. You will also be able to eek out a little more speed with moly, but an extra 30 fps at the muzzle doesn't really amount to much at 1000 yards, in drop, drift, or energy.

Shane
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  #32  
Old 10-13-2013, 07:02 PM
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Re: 308 win and the berger 215

Moly should of been something i tried with my factory rem barrel, that thing is rough and takes forever to clean. I may just leave that experiment for another time. I don't
wanna crowd myself with too many new things all at once.
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  #33  
Old 10-19-2013, 12:21 PM
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Re: 308 win and the berger 215

Ok so ive figured a few things out and thought i would report my findings in case shane and i are not the only two interested in this topic.

I got my hands on 4 lbs of re17 and 250 berger 215 hybrids, and started taking measurements on my rifle.

SAAMI spec for throat length for .308 win is 2.302 ( correct me if im wrong )
My rem 700 has a throat length of 2.325. ( erosion? )
This allowed a 3.145 C.O.A.L with the berger 215 to touch the lands.
That yielded a length of engagement of .215 between bullet and case.
My rifle can not normally eject a cartridge any longer than aprx 3.050.

I ordered a 30" lilja in a #7 contour w/ a 1:10 3 groove twist that should show up between jan-feb.

Now i will do some quick load development and find a charge that yields a velocity of aprx 2550 fps and see what COAL is required to compress that charge and add .02-.03 to finalize a throat dimension for the new barrel.

I also need to decide whether i want to cut the barrel to 26" and shoot it suppressed or leave it as long as possible and utilize every inch of barrel i paid for.

My suppressor gave me an additional 60 fps in my current load but im still uncertain about accuracy with it.
Im uncertain about what velocities i could achieve with a 29.5" barrel but fairly certain accuracy would be more consistent and wont miss the additional length and weight of the can.

Needless to say the next few months ill be burning up my current stock of ammo and finalizing dimensions of the new barrels chamber and length. Hopefully it shows up a little early.
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  #34  
Old 10-19-2013, 01:03 PM
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Re: 308 win and the berger 215

If it were me and I was intending to hunt with the 215's I would go with the 5r or a 6 grove barrel. I am not a fan of 3 groove cuts in a jacketed bullet.

Just a thought.

Jeff
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  #35  
Old 10-19-2013, 02:23 PM
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Re: 308 win and the berger 215

Quote:
If it were me and I was intending to hunt with the 215's I would go with the 5r or a 6 grove barrel. I am not a fan of 3 groove cuts in a jacketed bullet.
I think i will mainly shoot targets with this rifle, but could you elaborate on why you feel that way?
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