The very short bullet creates feeding issues. I didn't see any problems related to the large nose cavity. The issues I saw were related to the OAL of the loaded round. The bullet is so short that it is difficult to load to a decent OAL where it will feed reliably.

The jam I found most often was the base of the round diving into the mag and the round ending up jammed vertically between the bolt and the barrel extension.

OAL influencing feeding I understand, but what are you guys referring to concerning "nose cavity"?

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I'm personally eying the Remington 110gr 30Carbine softpoints.
http://media.midwayusa.com/ProductIm...1601456621.jpg
(Pic courtesy of MidwayUSA)

Would the OAL with this be too short with this bullet in 300AAC? If so, would it be OK in the 7.62x40? I'd love to get the same performance out of an AR that I can get with my 30-30.

That bullet seems worth trying. I am getting the 110 Sierra tested. Some deer were just shot with them and there was complete penetration.

They were talking about the 110gr Sierra Varminter which has a large hollow point compared to most rifle bullets. If loaded to a short OAL it may have some feeding issues in a 300W/300BLK AR. The longer case of the 7.62x40 (by about .2") won't allow it to be loaded short enough to cause problems as far as I know.

The .30 carbine bullet you pictured will most likely work in both but you may have to load long in the 300W/300BLK like the 110gr Sierra or you may not. You would just have to try them.

More info please. I'd like to know how they perform and at what velocity.

Diamondback Bullets have been working on some 220 gr. rbt bonded and non with with jackets that petal back and polimer ball that work very well on deer size game. Clearwater Custom Bullets are making some soft lead tips rnfb 220's for TC users that get the job done very well. Have not tried in bolt guns. Doesn't mean 100% conclusive test, but all bullets exited with quarter size holes. Longest distance run was 40 yds. with entering front sholder and exiting the stomach cavity. All of these make an impact sound that has to be heard to be believed. 5 deer and counting with youth season coming up again. Lehigh makes some good ones also. Two deer less than 6 feet. Complete penetration and major damage. Work good in single shot and bolt. Don't know about AR.. All have worked better than the 240's that we hope tumble. Hope this info helps. These companies have been working hard to find something that works.

What fps?

Why I'm considering the Remington 110gr softpoint 30Carbine bullet:
http://ammo.ar15.com/project/Misc_Im...1CarbineWP.jpg
http://ammo.ar15.com/project/Self_De...#.30%20carbine
The fact that it's so much cheaper than other rifle bullets scratched 6mmto7mm-.233 wildcats off my list.

alorton, I'm basically wrapping everything around this bullet. So I'll probably go 7.62x40 if it's too iffy with the 300AAC. I was leaning towards the 7.62x40 anyway...I just don't know if chamber dimensions can be had. Reloading dies are the easy part.

What fps?

The Remington 30Carbine 110grn JSPs:
http://ammo.ar15.com/project/Misc_Im...1CarbineWP.jpg
http://ammo.ar15.com/project/Self_De...#.30%20carbine


alorton, I'm wrapping everything around this bullet as they are much cheaper than most other rifle bullets. So I'll probably lean towards the 7.62x40 then....if chamber dimensions can still be had.