Originally Posted by
bobthenailer
Tightgroup takes about the same powder charge weight and case volume as BE. I beleive its a flattened ball powder like WSF & 231 . It is also designed NOT to be powder position sensative , so its good for reduced loads in larger pistol cases. in the 44 mag i normaly use 7.0 grs @950 fps in the 454 casull i use 8.0 to 9.0 grs @ 1,000 to 1,100 fps. TG powder also keeps the gun a little cleaner inside & out than BE powder.
IMO if you are worried with a double powder charge! choose a powder that will about fill the case with a double charge , say 20 grs cut that in half and use 10 grs of a approate powder that will get you the velocties you want.
Or possibly try Trail boss powder which is bulkier approx 2.0 to 2.5 times more so than most and made to take up alot of case volume for med to low velocity loads with large pistol cases .