212eldx in .308 hybrid cases?

[Eo12]

Is anyone else loading these in the hybrid cases? Read about them here and they sound like absolute hammers in a lightweight hunting rifle.

308 +P+ and Musings from Elk Camp

Walter recently concluded a two-week trip to Southern Colorado elk hunting with the Noveske crew.

sobchaksecurity.substack.com

 

[redbullitt]

45-90 has done a lot of awesome stuff... we all appreciate the sharing very much!

I bet he can help you quite a bit there.

 

[Eo12]

@45-90 have you tried any of the hybrid cases with this bullet in .308?

 

[45-90]

@45-90 have you tried any of the hybrid cases with this bullet in .308?

Been shooting hybrid cases in various 308 bases cases since they first came out.
308, 358, 6.5 CM, 8.6 blackout.
I don't shoot as many game bullets these days, but alot of match bullets...depending on caliber.

I recently fired some hybrid cases with 308 in a 22" barrel 9 twist barrel.
These were Berger 208 gr and Berger 215 gr. With 6.5 Staball, notice the 208 Berger hybrid have a high BC and low S/ D and better accuracy in my rifle.
If you shorten the overall length take out a few grains of powder and work up.
I manderal up to 30 cal and run through a 308 FL die anneal, and neck turn as shown in the lathe with a ground carbide tool that has a sharper radius in the neck shoulder junction and slightly cuts the 20° angle.
No donuts for pinch points at high pressure and little spring back. It all can be done with hand tools just takes longer.
As always be careful work up slowly, they safe in my rifle, but every barrel and chamber is different. ...For Bolt Gun Only.
I have 8 308s for various purposes bolts and autos, long action and short.
The long action 30" 8 twist has some fantastic velocities for a 308 case, like 225 eldm at 2700 fps, or 168 gr at 3255 fps, 200 SMK at 2952.
But if ya want short barrels you'll lose alot of velocity.
If you shoot short barrels stay with heavy bullets, the velocity difference will be considerably less.
The 308 of today doesn't have to be the 308 of 50 yrs ago.

 

[45-90]

I don't always have time to work on hybrid case load data, because I like to do other weird projects....today I shot some test loads out of the 510 whisper....the usual subsonic 650 gr FMJ...and some 300 gr Barnes that hit 2875 fps for 5500 ft/bs of energy.
But that's not the end of the dream...only the beginning.
I can fit this in an AR10,... but also in an AR 15!
18" barrel low pressure round would get close to 3600 ft/lbs of energy out of the 300 gr Barnes 510 cal AR 15.
But you have to machine a barrel complete from a barrel blank. And cut the brass case heads down to 308, and cut a new extractor groove, a 450 bushmaster bolt, and alter the 450 BM mag, 450 bushmaster barrel extension.

Just like the 30 RAR I built from scratch, if ya want one gotta make it yourself.
These wild out of the box projects take time and money, from practical reloading experiments... and its all just a hobby.
Here is the .510 Whisper cal in bushmaster mag, needs machining. And here it is in the 450 bushmaster AR 15.
Notice the back of 2nd from left has a home machined rebated head & new extractor groove to fit an AR 10...the AR 15 even more drastic.
So I've been contemplating this idea. The subs will be 560 gr homemade for this particular endevor, already machined the sub bullet, in AR 15 mag...AR 10 has more room, and more pressure available.
Tons of experiments like 350 gr Makers at 1806 fps instead of the 1000 fps limit in the 6.5 twist instead of the 3 twist, with the bore rider concept emoyed...plus the tiny 338 Spectre with a 350 gr Maker achieving 1100 fps.
Everyone's shooting standard stuff, let's think outside the box....time to talk to Elon. ...

 

[Eo12]

Been shooting hybrid cases in various 308 bases cases since they first came out.
308, 358, 6.5 CM, 8.6 blackout.
I don't shoot as many game bullets these days, but alot of match bullets...depending on caliber.

I recently fired some hybrid cases with 308 in a 22" barrel 9 twist barrel.
These were Berger 208 gr and Berger 215 gr. With 6.5 Staball, notice the 208 Berger hybrid have a high BC and low S/ D and better accuracy in my rifle.
If you shorten the overall length take out a few grains of powder and work up.
I manderal up to 30 cal and run through a 308 FL die anneal, and neck turn as shown in the lathe with a ground carbide tool that has a sharper radius in the neck shoulder junction and slightly cuts the 20° angle.
No donuts for pinch points at high pressure and little spring back. It all can be done with hand tools just takes longer.
As always be careful work up slowly, they safe in my rifle, but every barrel and chamber is different. ...For Bolt Gun Only.
I have 8 308s for various purposes bolts and autos, long action and short.
The long action 30" 8 twist has some fantastic velocities for a 308 case, like 225 eldm at 2700 fps, or 168 gr at 3255 fps, 200 SMK at 2952.
But if ya want short barrels you'll lose alot of velocity.
If you shoot short barrels stay with heavy bullets, the velocity difference will be considerably less.
The 308 of today doesn't have to be the 308 of 50 yrs ago.

Thank you so much for sharing your insight on this. Hopefully my results will be similar to yours. That article really got me excited about the possibilities of the 308 again.

 

[Eo12]

I don't always have time to work on hybrid case load data, because I like to do other weird projects....today I shot some test loads out of the 510 whisper....the usual subsonic 650 gr FMJ...and some 300 gr Barnes that hit 2875 fps for 5500 ft/bs of energy.
But that's not the end of the dream...only the beginning.
I can fit this in an AR10,... but also in an AR 15!
18" barrel low pressure round would get close to 3600 ft/lbs of energy out of the 300 gr Barnes 510 cal AR 15.
But you have to machine a barrel complete from a barrel blank. And cut the brass case heads down to 308, and cut a new extractor groove, a 450 bushmaster bolt, and alter the 450 BM mag, 450 bushmaster barrel extension.

Just like the 30 RAR I built from scratch, if ya want one gotta make it yourself.
These wild out of the box projects take time and money, from practical reloading experiments... and its all just a hobby.
Here is the .510 Whisper cal in bushmaster mag, needs machining. And here it is in the 450 bushmaster AR 15.
Notice the back of 2nd from left has a home machined rebated head & new extractor groove to fit an AR 10...the AR 15 even more drastic.
So I've been contemplating this idea. The subs will be 560 gr homemade for this particular endevor, already machined the sub bullet, in AR 15 mag...AR 10 has more room, and more pressure available.
Tons of experiments like 350 gr Makers at 1806 fps instead of the 1000 fps limit in the 6.5 twist instead of the 3 twist, with the bore rider concept emoyed...plus the tiny 338 Spectre with a 350 gr Maker achieving 1100 fps.
Everyone's shooting standard stuff, let's think outside the box....time to talk to Elon. ...

Your creativity with those rounds is what is needed. Keep doing great work. I’m sure we are all enjoying watching your mind at work.