They were running close to that out of my 10" barrel also. This load does not need much barrel to work, as it is basically an inefficient 380 auto in 30 caliber.
When I get my new barrel in I'll probably experiment with these some more. I'm glad to hear you've had luck with the Trailboss load.
-Dan
FYI, since you said you didn't have a chrony 4.8 gr trailboss, 90 gr xtp run 945 – 1040 fps out of my 16 inch bolt gun at 90 degrees & 900 ft above sea level.
Thanks for the info....I as hoping for something close to that vel. I know I was out in the orchard last evening and shooting some pears I had placed on a fence rail at about 50 yds. The sound of the THWACK when the pear explodes was louder than the discharge of the weapon.
I am at 300' elevation and it was rainy and 45 degrees!