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AR-15 with 1/12 twist barrel

 
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  #15  
Old 09-08-2011, 12:21 PM
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Join Date: Jan 2004
Location: Dallas, Texas
Posts: 164
Re: AR-15 with 1/12 twist barrel

Rdsii64;
I really appreciate your reply. I had decided the 53g Vmax was the bullet to get. Your reply confirms my choice. You have me wondering about the N150. I so far have not found any loading info on N150 but is it not a slower burning powder designed for heavier bullets?
I read your bio and want to first off say thanks for your service. I truly admire what you have accomplished.
I have a 25/270wsm wildcat that loves Retumbo and with that powder is deadly accurate. Now the bullet is a 110 grain bullet though not 53 grains but It truly will shoot better than I can. So when you mentioned N150 it got me thinking and I had to ask you for more info.
I appreciate your sharing your knowledge.
Thanks
Dave
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  #16  
Old 09-08-2011, 01:21 PM
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Re: AR-15 with 1/12 twist barrel

Dave,

Not to butt in here, but yes, the N150 is a bit slow for this bullet weight. Good powder, but really better suited to 308s, 30/06s, and so on. N140 works well for the heavier bullets in a 223, and N133 or N135 would be even better suited to the 50-55 grain bullets. Should give you better velocities there, but the N150 would certianly keep you from having pressure problems. Just can't get enough in the case to create a high pressure load.

You can access all of our reloading data on our website, www.lapua.com, under the reloading heading.
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  #17  
Old 09-08-2011, 02:04 PM
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Re: AR-15 with 1/12 twist barrel

Kevin:
Yes I was looking at your site and trying to see what you all thought.
Thanks for the help and your help is always appreciated.
Dave
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  #18  
Old 09-08-2011, 02:07 PM
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Re: AR-15 with 1/12 twist barrel

Kevin:
If a person did load N150 what velocity would it generate using a 53gn bullet? Would it throw a fireball of unused powder? Just wondering?
Thanks
Dave
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  #19  
Old 09-08-2011, 02:31 PM
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Re: AR-15 with 1/12 twist barrel

Dave,

Running this combination on QuickLoad shows a very poor percentage of the powder being burned with the 53 grain/N150 combination, probably around 90%, depending on a number of factors. This, incidentally doesn't equate to muzzle flash, as that's almost never actually unburned powder that you're seeing. Muzzle flash is most often caused by a re-ignition of the powder gases as they exit the muzzle. Even thought the powder is completely burned, the powder gases themselves remain combustable. Upon exiting the muzzle, the sudden addition of a new source of oxygen creates what amounts to a secondary explosion, which we see and hear as excessive muzzle flash. Not unburned powder at all, in most cases.
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  #20  
Old 09-08-2011, 04:49 PM
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Re: AR-15 with 1/12 twist barrel

Kevin:

Do you have an opinion on TAC and IMR, Co IMR 8208 XBR?
Thanks
Dave
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  #21  
Old 09-09-2011, 02:38 AM
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Re: AR-15 with 1/12 twist barrel

Quote:
Originally Posted by texasdave View Post
Rdsii64;
I really appreciate your reply. I had decided the 53g Vmax was the bullet to get. Your reply confirms my choice. You have me wondering about the N150. I so far have not found any loading info on N150 but is it not a slower burning powder designed for heavier bullets?
I read your bio and want to first off say thanks for your service. I truly admire what you have accomplished.
I have a 25/270wsm wildcat that loves Retumbo and with that powder is deadly accurate. Now the bullet is a 110 grain bullet though not 53 grains but It truly will shoot better than I can. So when you mentioned N150 it got me thinking and I had to ask you for more info.
I appreciate your sharing your knowledge.
Thanks
Dave
I made mistake I ment to say N133
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