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Tight bore for magnums

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Unread 11-14-2007, 01:31 AM
Silver Member
Join Date: Jun 2003
Posts: 179
Tight bore for magnums

Anyboy ever tried or know anything about possibly using one of the tight palma 30 cal bores with a large magnum cartridge?
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Unread 11-14-2007, 01:52 AM
Gold Member
Join Date: Sep 2005
Posts: 748
Dont do it

Hi don't do it. We fit hundreds of Palma type barrels. They have to be under .3075" some are as tight as .306".

The limited projectiles used must be under 155gr so their is only a short bearing surface st the tighter bore allows a tight seal on the projectile.

If you use heavy projectiles the tight bore creates to much back pressure causing distortian to the jacket and projectile. Any 30cal that will be shooting 190gr+ bullet weight we have found they don't shoot well at all.

However if you only want to shoot 155gr Sierra,s then a 14 twist 307 barrel would shoot verry well but you will be limited in projectiles

Cheers Bill
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Unread 11-14-2007, 07:55 AM
Platinum Member
Join Date: Jun 2007
Location: Wilmington NC
Posts: 4,690
The new 208 Amaxs DO NOT like a tight bore for sure. Several shooters that Hornady had testing them had to change barrels to get them to shoot because of the tighter dimensions between mftrs. Harts work very well with the Amax.

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