Long bullet jump and throat erosion...


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Eyesac
March 6, 2010, 01:12 PM
I read once that long bullet jump can increase throat erosion, is this just a rumor? Or has anyone had this experience? I realize that there’s probably no real data out there, but has anyone loaded rounds with a big jump (like .2 or more) and had a throat erode extra fast or prematurely?

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rcmodel
March 6, 2010, 01:28 PM
Many factory rifles made more recently probably have more then .2 jump when shooting factory ammo in them. It's a lawyer thing to reduce pressure.

Weatherby started the very long free-bore thing about 1948 to get extra velocity with less pressure.

I don't think Weatherby rifle's burn out barrels any faster then any other caliber that burns that much powder every shot.

rc

243winxb
March 6, 2010, 04:29 PM
If the base of the bullet leaves the case mouth before the bullet seals the bore, you get more throat erosion or gas cutting.

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