Tested one of my 45cal QB's today.
I built these for shooting round ball mostly due to the lower power set at around 180 to 200fpe.
The gun has a 22in. barrel and the 7/8 tube and gets 4 good shots. Not too bad for a small air tube.
This gun turned out to have a little more power than the others so i needed a little heavier bullets to shoot. After looking in my supply nuthing smaller than 400gr so i had to do some casting.
Sorting thru my vast collection of about 7 molds with only 3 being in the 45cal range I chose a 230gr round nose and a 260gr R.E.A.L bullet. The only round ball i had was some undersized that someone had sent me.
First the Real bullet was shot with a 3500 fill pushing at 700fps.
Grouping was so so but i new it could be better although i was shooting offhand.
Then came the 230gr round nose groups were all aver the place.
Then noticing a little action movement and found the action was moving some so tighting the bolt was a try.
After the 2nd test the group was tight with the REAL bullet but the round nose was still all over the place possible they were 456 dia or the barrel just don't like them.
The round ball would have done well if i would have had some 457cal on hand. Can't find them here local.
After all this it was still a good day for being out of the shop for some Me Time.
So keep your screws tight as it helps more than having your screws loose.