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As JonBlack noted you are much better off with a 60gr Aquila subsonic .22LR and here are some reasons why:
You can work up a load to get your 62gr .223 down to 1000fps but at that speed you will find the bullets are not stabilized and may tumble. This is because the twist rate is usually not what you need for subsonic shooting. Another issue is the loading itself, you can pull bullets and remove powder or dump powder and reload with the same powder but in the volume needed for subsonic shooting you may be approaching the dreaded detonation at worst or inconsistancy at best. Unless you get into some heavier bullets all you end up with a poor but expensive version of the .22LR. If you do get into the heavy bullets you just get more problems with stabilizing them subsonic in standard rifling twists.
So to summarize, your best bet is to buy the Aquila SSS 60gr subsonics for dealing with armored squirrels. You get the same power that you would with the .223 subsonic and no where near the headache.
Frank
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Threaded Mode