Slow first round on sub load

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

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Kennybaseball17
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Joined: Thu Aug 01, 2019 9:41 pm

Slow first round on sub load

Post by Kennybaseball17 » Thu Aug 01, 2019 9:51 pm

Help please, I keep getting a super slow round normally on my first round. Five shot groups the first is around 850 and the rest fall right in line at 1050. Tried A1680 and h4198. What gives? Using 220gr berry bullets.

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bangbangping
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Re: Slow first round on sub load

Post by bangbangping » Thu Aug 01, 2019 11:43 pm

First round as in first of the day with a cold barrel? Clean barrel? First round of each mag?

Kennybaseball17
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Re: Slow first round on sub load

Post by Kennybaseball17 » Fri Aug 02, 2019 7:34 am

Seems to be first round of the mag. Defiantly first on a cold barrel

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