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Berger 155.5 fullbore ?? Help

 
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  #1  
Old 07-28-2011, 01:26 AM
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Berger 155.5 fullbore ?? Help

I've been shooting 168 smk out of my factory Remington 308 getting .5 moa.
The Guys at the club shoot berger 155.5 and said I should try them.
The 168 smk is seated .040 off the lands.
When I measured for bergers to the lands only the boattail was in the neck and no bearing surface.
If I seat it to the same amount as the smk I have .150 jump to the lands.
From what I've read the bergers like to be touching or close.
How much bearing surface do I need in the neck to be safe?
Has anyone had any luck jumping the bergers this far?
Should I just stick with the smk's?
I know out of a factory rifle I cant ask for much better.

Thanks
Ramp
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Old 07-28-2011, 07:07 PM
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Re: Berger 155.5 fullbore ?? Help

I changed from 175 SMKs to the Berger Fullbores and the shorter bearing service is a problem to work with. But I could reach the lands with a a decent amount of bullet still in the neck.


Read the sticky at the top of the page about jumping Bergers and maybe you will find something (but perhaps not as some of the factory rifles just have a lot of freebore).

Getting the Best Precision and Accuracy from Berger VLD bullets in Your Rifle

Good Luck
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Old 07-28-2011, 09:09 PM
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Re: Berger 155.5 fullbore ?? Help

Thanks Bob I'll check it out.
Whats the least amount of bearing surface in the neck I can get away with.
I only use this rifle for target matches.

Thanks
Ramp

Last edited by ramp; 07-28-2011 at 09:39 PM. Reason: Added ??
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Old 07-28-2011, 10:21 PM
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Re: Berger 155.5 fullbore ?? Help

I have shot Berger VLD's in many Weatherby chamberings where the freebore keeps you way back off the lands. .200" in some cases. I also worked up loads for a 7mm-300 and ended up .115" off the lands. Accuracy was good in all instances and I am talking 1/2 moa or better.

Jeff
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Old 07-29-2011, 06:25 AM
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Re: Berger 155.5 fullbore ?? Help

Quote:
Whats the least amount of bearing surface in the neck I can get away with.
I only use this rifle for target matches.
I don't know. A lot would be how careful you are handling them and feeding them into the chamber.

A lot of people are shooting 185s in FT/R. You might consider them if you can't get the Fullbores to jump well.

As Broz said, many of us have shot factory chambered Weatherby's for years and jumped all kinds of bullets but the short bearing surface ones don't always come out of the barrel with competition required accuracy. I used to shoot some 115 HPs in a 7mm Wby at ridiculous speeds and moderate accuracy at groundhogs but I seldom killed any over 350yds away with that combination.
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Old 07-29-2011, 08:46 AM
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Re: Berger 155.5 fullbore ?? Help

I normally jump the B155.5BT about 0.045-0.050" in my 12 F/TR. With the factory Obermeyer chamber (and a little bit of wear on the throat) that currently leaves me with just under 0.100" of bearing surface still in the case neck - but it does shoot *very* well...

The general rule of thumb I'd always heard was to try and keep at least 1/2 caliber worth of bearing surface in the neck, i.e. about 150 thou minimum for a .30 cal. Obviously not a hard and fast rule as per above, but I'm dealing with relatively delicate target rounds on a flat range, not something used in the field.
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Old 07-29-2011, 03:07 PM
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Re: Berger 155.5 fullbore ?? Help

Thanks Milanuk.
If I seat 1/2 bearing surface into neck I have .194 jump.
1/4= .117 jump.
I think im going to start at .117 and work my way back.
Unless someone tell's me it a bad idea.
Thank's for the help folk's.

Later
Ramp
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