Have loaded up the BB 300 gr. with 58 gr. of H335 as per Marshall"s suggestions. Not having a chronograph I am interested in an approximate educated guess as to what velocity I might be experiencing with this load out of a 22" Microgroove barrel. By the way it shoots great, and kicks like you know what. Thanks-Karl:D

I use 55grs. of H-335 with a 300gr bullet and from an 18.5" barrel I get 2100'/sec. I'd guess you are getting around 2250-2300'/sec. with 58 grs. That should take any animal anywhere.
Walt