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when you get into subsonic shooting you sometimes have to think backwards. You may have to decrease your charge to get the velocity down to 1050. You will sometimes get bullet drag. 8" to 10" is optimal for subs. Everything after that is extra drag that you will have to overcome with more powder. It's not always the case, but don't be surprised if it happens. As for accuracy, shorter barrels are stiffer and everything else being equal will be more accurate. It was not true before scopes due to sight radius of irons.
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