AR10 bullet jump ?

R

Relentless2013

New member
You guys who are reloading for your AR10s, what kind of jump to the lands are you loading from? I know every gun likes something different but was just wondering what you typically start at. I’m reloading 70 NBts and I’m starting at .20ths of jump going .05 deeper down to .40ths deep to see if I can tighten my groups, do you think that’s a good start or should I start deeper to start?
 
243 right? I'd go 5 to 10 off to start with if you can and I bet it shoots. Try a test with a dummy round, to see if the bullet is creeping out when slammed into the chamber by the force of the heavy recoil spring and bolt that these rifles use. Shouldn't be a problem with a bullet that light, but I've had issues with the 125 nbt in my 30 RAR uppers creeping out and causing me accuracy problems. But as far as where I'd start, I'd go as long as I could and work back.
 
204 AR said:
243 right? I'd go 5 to 10 off to start with if you can and I bet it shoots. Try a test with a dummy round, to see if the bullet is creeping out when slammed into the chamber by the force of the heavy recoil spring and bolt that these rifles use. Shouldn't be a problem with a bullet that light, but I've had issues with the 125 nbt in my 30 RAR uppers creeping out and causing me accuracy problems. But as far as where I'd start, I'd go as long as I could and work back.
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Sorry forgot to mention it but it’s a short throated 6mm Creedmoor, and I use neck bushings and a light factory crimp with a Lee die.
 
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