Updated OALs

Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge.

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300Blk
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Updated OALs

Post by 300Blk »

This is my latest data for most optimal feeding from an AR magazine.

• Hornady 110 V-Max, OAL: 2.068
• Nosler Ballistic Tip 125 grain, OAL: 2.085
• Remington AccuTip 125 grain, OAL: 2.130
• Sierra 150 FMJ-BT, OAL: 2.080
• Sierra 150 ProHunter, OAL: 2.040
• Sierra 155 #2156 Palma, OAL: 2.130
• Sierra 210 MatchKing, OAL: 2.190
• Sierra 220 MatchKing, OAL: 2.089
• Hornady 225, OAL: 2.140
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Re: Updated OALs

Post by 1911man »

silencertalk wrote:This is my latest data for most optimal feeding from an AR magazine.

• Hornady 110 V-Max, OAL: 2.068
• Nosler Ballistic Tip 125 grain, OAL: 2.085
• Remington AccuTip 125 grain, OAL: 2.130
• Sierra 150 FMJ-BT, OAL: 2.080
• Sierra 150 ProHunter, OAL: 2.040
• Sierra 155 #2156 Palma, OAL: 2.130
• Sierra 210 MatchKing, OAL: 2.190
• Sierra 220 MatchKing, OAL: 2.089
• Hornady 225, OAL: 2.140
What magazine? They are all different and respond differently.
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300Blk
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Re: Updated OALs

Post by 300Blk »

Aluminum.
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Conqueror
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Re: Updated OALs

Post by Conqueror »

I remember you saying that these OALs are optimized to make the rib contact the bullet where its diameter matches the .223 case neck. Have you considered asking one of the die makers to make a comparator insert in that diameter? That way people could measure to a more consistent point than OAL (same idea as measuring base to ogive, just using a different diameter for the gauge).
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300Blk
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Re: Updated OALs

Post by 300Blk »

Most of those values where made from CAD software loading the bullet and the magazine model and checking nominal fit.
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msgmwrdn
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Re: Updated OALs

Post by msgmwrdn »

Just curious have you tried the funtion/reliability of the 300 Blk in a Beta Mag?
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300Blk
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Re: Updated OALs

Post by 300Blk »

No, but I have a SF mag on order and will eventually try that. I own Beta mags, but lost interest in them.
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rob_s
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Re: Updated OALs

Post by rob_s »

Does this mean that the magazines with the rib removed will not be necessary?
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300Blk
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Re: Updated OALs

Post by 300Blk »

The magazines with the rib removed are necessary for ammo loaded longer. A prime example of this is 3-gun ammo which makes major PF. That calls for a 175 grain MatchKing loaded to 2.26 OAL which will make 330PF in a 16 inch barrel.
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ronin111
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Re: Updated OALs

Post by ronin111 »

Hornady 225

Are these available yet?
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