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Old 01-08-2013, 02:13   #1
Raleigh Glocker
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Lehigh Defense's 300 BLK 170gr Controlled Fracturing Subsonic

The 170gr CF bullet from Lehigh Defense has a very interesting feature. It is a machined brass bullet with a .17 caliber bullet pressed into its hollowpoint. I couldn't wait to test these.

This factory loaded round came up a little short on velocity from my Handi Rifle (798.5fps avg), but Lehigh wanted me to test it anyway. I think this would make a good coyote round as is, but it would be interesting to see what this would do if pushed 200fps faster. They would also do a number on a deer's neck, if that is a shot you're comfortable taking.

Note that machined brass bullets are especially sensitive to variations in bore diameter because they don't extrude the same as copper or lead. So, what I saw for accuracy or velocity is more likely to be different for other barrels than conventional bullets.

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Old 01-08-2013, 20:35   #2
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I think I remember watching this video over on AR-15 forums. IIRC, there were some potential feeding issues in the AR platforms because of the bullet design. Although I love the idea of the expanding round for a subsonic .300 BLK, the fact that there could be issues feeding in a semi just kills it for me.
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Old 01-08-2013, 21:53   #3
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I think I remember watching this video over on AR-15 forums. IIRC, there were some potential feeding issues in the AR platforms because of the bullet design. Although I love the idea of the expanding round for a subsonic .300 BLK, the fact that there could be issues feeding in a semi just kills it for me.
How bad of feeding issues?

Would it work for the first shot?
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Old 01-09-2013, 16:30   #4
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I can't remember if it was brought up in the video, or in the posts over on ARFcom, but it seemed like the bullets were either too long to fit in the AR magazine or the flat front of the bullet could potentially hang up on stripping from the magazine.
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Old 01-09-2013, 17:24   #5
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Neat round with a lot of thought put into. But it looks like a mouse fart load. Very low speed and energy. Bet it is over $2 per round also.

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Old 01-09-2013, 18:26   #6
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Neat round with a lot of thought put into. But it looks like a mouse fart load. Very low speed and energy. Bet it is over $2 per round also.
The round is for subsonic suppressed fire. It should be loaded at around 1000FPS, but ......

Yes, it is expensive, but if it worked as advertized....
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Old 01-09-2013, 18:47   #7
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I'm glad to see that there is a lot of bullet research going on. They haven't killed the sport yet.
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Old 01-10-2013, 04:16   #8
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This round did not have any problems feeding. That was the 200gr ME round.

I let Lehigh Defense know that the velocity was low for me, but they asked me to proceed with the testing anyway. They said that brass bullets are much more sensitive to actual bore than copper and/or lead bullets.

It still looks like a reloader could get a lot out of this bullet since there's about 30% more energy that can be put on it while remaining subsonic. They do sell just the bullets for those that want them.

ETA: The most surprising thing for me was that these actually cycled my 8" Noveske-barreled SBR, which won't cycle Remington 220gr without a suppressor. So, I'm definitely not overgassed.
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Old 01-10-2013, 12:23   #9
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I have lost track here. What caliber are we discussing?
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Old 01-10-2013, 13:21   #10
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I have lost track here. What caliber are we discussing?
Any .308 subsonic round.
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Old 01-10-2013, 13:32   #11
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Any .308 subsonic round.
So the .308 Winchester loaded down. Or a .30-30.
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Old 01-10-2013, 13:39   #12
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So the .308 Winchester loaded down. Or a .30-30.
Single shot yes.
Tube mag....maybe.
Standard barrel probably doesn't have the rate of twist needed to run that bullet suppresses without a baffle strike.

But then again, do you have your 30-30 setup for a suppressor?
If you do I would like to see a picture. I always thought the old lever action rifles with maxim suppressors were cool.
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Old 01-13-2013, 19:08   #13
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Single shot yes.
Tube mag....maybe.
Standard barrel probably doesn't have the rate of twist needed to run that bullet suppresses without a baffle strike.

But then again, do you have your 30-30 setup for a suppressor?
If you do I would like to see a picture. I always thought the old lever action rifles with maxim suppressors were cool.
Nope.
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