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Author Topic: Patching bore riding bullets  (Read 1817 times)

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Offline Nobade

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Patching bore riding bullets
« on: September 21, 2011, 03:13:21 AM »
For a while I have been wondering if this would work very well. Last weekend I tried it and it works great! Starting with the RCBS 30 cal. 150gr. cowboy bullet, cast from air cooled wheelweights, I ran them through a .303" sizer, patched them past the break on the ogive with 9# onionskin paper, lubed with Rooster Jacket, and run through a .309" sizer. The body ends up at .310" and the nose at .307". Loaded them in my 30-06 to firmly engrave the throat, powder was Win WXR topped with Cream 'O' Wheat. Velocity was 2550 fps, and I was having no problem hitting our 8 inch hanging steel disc at 300M using the Lyman peep sights. Bore stayed clean, absolutely no leading, and no fall off in accuracy after 40 rounds fired. So if all you have is a bore rider design mould and you want to try paper patching, go for it! It works fine!
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Offline flmason

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Re: Patching bore riding bullets
« Reply #1 on: December 17, 2011, 08:19:13 PM »
Forgive my ignorance here, what's a "bore riding" bullet exactly?
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Offline Nobade

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Re: Patching bore riding bullets
« Reply #2 on: December 20, 2011, 02:36:50 PM »
All of the RCBS silhouette designs are good examples of bore riders. They are a two diameter bullet, the front portion being bore size or just above, so they very lightly engrave when chambered. The rear portion is groove size or a bit bigger so it will seal the gas behind it. The idea is to have a bullet that doesn't seat too deeply in the case, but has sufficient weight to be useful. Some cartridges really benefit from this, such as the 308 Win. since it has a fairly short neck and the rifles made for it normally have a short throat.

Most of the time bullets of this type will shoot very accurately, but only if the bore riding nose fits the rifle's bore correctly. It really needs to be a firm thumb press into the muzzle to work right. Too big and you can't chamber it, too small and accuracy will be awful.
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Offline Reverend Recoil

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Re: Patching bore riding bullets
« Reply #3 on: January 03, 2012, 04:27:00 AM »
I am working on the same paper patch project for my 30-06 and 7.5x55 rifles.  Last week I received a new RCBS 311-165-SIL mold and a stack of 9# onion skin paper.  It should work well.  It might also work for my 30-30 Marlin.  I will post the results.
 
Next week I will be hog hunting with my 9.3x74R loaded with paper patched cast bullets.
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