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short answer to that...sweet fark all
unless you hit dead on the central nervous system you will have a runner.even if you smack it through boiler room it will still run until bleeds out,which will...

you know its not a huge expense to get it cut and rethreaded???...you COULD run with it full length for a bit then cut shorter if it really feels needed....I used to run really short barrels but have...

and most folks who do try subsonics,realise the awesome 151s Robert makes do just about as good of job at fraction of the price and will stabalise in just about anything..... then after using subs...

surprised someone hasnt said get a .243 instead LOL......

1;12 because it wont be as hard on soft projectiles going fast..... speer is good and cheap.

it will work fine..the worst it will do is make them more fragile as they will be spinning faster...but you can slow them down if thats too much of an issue.