20 is a handy length, iv got a Gunworks 12 inch maximus suppressor (pretty sure it is anyway iv had it a long time now) my load is 77grains of 2217. its been my go to rifle for more than 10 years. I'm not sure how it will go with the likes of your 200grainers to try get "decent" speeds, although I am going to do a batch of 200grainers to see how they go as I'm running out of 178grain projectiles and cant seem to find any.
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