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MK 248 MOD 1 .300 Winchester Magnum Round

 
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  #8  
Old 12-05-2013, 11:40 AM
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Re: MK 248 MOD 1 .300 Winchester Magnum Round

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Originally Posted by alaska View Post
FC military Brass (FC 12)
FC 215 Match Primer (crimped)
H1000 at 77.7
220 MK bullet

3.500 COAL

Warning!

To try to dupicate this load you might run into blown primers because they crimp the primers in.
Very hot load.......suggest reduce load to 76.5 to 77.0
Correction to above load FC uses Fed 210M primer (not crimped)
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  #9  
Old 12-05-2013, 09:21 PM
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Re: MK 248 MOD 1 .300 Winchester Magnum Round

If you want an accurate load, try 79gr of RE25 with a 200gr Accubond.
This load gave me better accuracy than any other, even better than H1000 would give me with lower velocity.
Cheers.
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  #10  
Old 12-05-2013, 09:42 PM
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Re: MK 248 MOD 1 .300 Winchester Magnum Round

Double based powders are very hard on throat area



Military used the RL 22 with the MK 248 Mod 0 load prior to the Mod 1 with H1000.

Last edited by alaska; 12-05-2013 at 11:59 PM.
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  #11  
Old 12-05-2013, 10:37 PM
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Re: MK 248 MOD 1 .300 Winchester Magnum Round

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Originally Posted by alaska View Post
Reloader 33 in 300 WM to take advantage of it you will need a longer barrel than 26"
Likely you are right, I recently bought some, won't hurt to try a few rounds in my Sendero to see
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  #12  
Old 12-06-2013, 12:28 AM
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Join Date: Feb 2010
Location: Alaska
Posts: 333
Re: MK 248 MOD 1 .300 Winchester Magnum Round

Quote:
Originally Posted by alaska View Post
FC military Brass (FC 12)
FC 215 Match Primer (crimped)
H1000 at 77.7
220 MK bullet

3.500 COAL

Warning!

To try to dupicate this load you might run into blown primers because they crimp the primers in.
Very hot load.......suggest reduce load to 76.5 to 77.0
fed 210 Match primers used in MK 248 Mod 1 loads not FC 215m (no crimp)
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  #13  
Old 12-06-2013, 02:59 AM
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Location: So. California
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Re: MK 248 MOD 1 .300 Winchester Magnum Round

If you look around you should be able to get the actual PDF that tells literally everything there is to know about this round. The max working pressure allowed under variance of pressure is somewhere around 78kpsi ...77 or 78...pretty insane.
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  #14  
Old 12-06-2013, 09:39 AM
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Join Date: Feb 2010
Location: Alaska
Posts: 333
Re: MK 248 MOD 1 .300 Winchester Magnum Round

Really is too hot of a round 77.8 is the load
I read somewhere production was halted on this round
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