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Free bore

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Old 01-06-2005, 07:13 PM
Gold Member
Join Date: Jan 2003
Location: centre,alabama
Posts: 948
Free bore

Let's hear pro/con on free bore??
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Old 01-06-2005, 07:54 PM
Bronze Member
Join Date: Nov 2001
Location: Sydney Australia
Posts: 40
Re: Free bore

Less likely to get pressure spikes with hot loads.

Seems to give higher velocities with powders that are faster burning than normal for the calibre.

Seems in general to be more likely to put the first shot from a cold clean barrel or a barrel with cold hard fouling into the group.

If the freebore diameter is not real close to bullet diameter then accuracy problems, especially in terms of the limited range of loads that will shoot.

For calibres with big cases and huge freebore such as the 378 and 460 Wby reduced loads down in the 80 grain area become a problem with hangfires. For example the 416 Wby which does not have the big freebore is easier to work with reduced loads than either the 378 or 460.

In my experience and for accurate hunting style rifles chambered in calibres with a big case capacity for the bore size AND provided the freebore diameter is not oversize, then I think overall it is a gain.

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Old 01-06-2005, 09:56 PM
Gold Member
Join Date: Jan 2003
Location: centre,alabama
Posts: 948
Re: Free bore

Thanks for your reply Mike. Are there any more??
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