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Bullets scraping on lands
updated 1 year ago
2 Members
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6
Posts
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Hi,
I’m using cast 135gr bullets made for 30-30 to reload 300 BLK.
They’re scraping on the lands when chambered. No bullet setback and they cycle fine. Anything wrong with this?
Just plinking ammo.
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Just be careful, if you eject a live round and the bullet gets pulled from the case. You’ll have powder all over the place and could risk a plugged barrel (although the bullet would likely prevent subsequent chambering of another round). Murphy’s Law rules…
Generally, you should have some free bore, so that the bullet is not wedged into the rifling when chambered. This can result in over pressure conditions. It’s not uncommon for a cast bullet to have slight interference with the chamber throat, but if excessive, I’d adjust your COL to eliminate this contact.
Most don’t recommend cast bullets in gas guns, but I don’t know what you’re shooting. I suppose coated bullets are okay. I don’t own any ARs, but I do have DI auto-loaders.
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If they fire without pressure signs, you’re good to go.
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Sent a picture of your finished round and a purchase source for us 300 black shooters
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Should be fine. What is the nose diameter ahead of the last driving band? It should be .300″ +/- .001.
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How bad are they scraping? Typically you don’t want to jam into the lands, but making contact is not a rare thing and is often desired. Lead has a pretty low engraving pressure (not zero, but low) so as long as you worked up your load jamming into the lands you’re good to go.
