From a previous post. (
http://www.huntingnet.com//forum/tm.aspx?m=2350921)
Underclocked - If you try that Great Plains again, humor me and weight sort the bullets and weigh the powder charges equivalent to90 grains by volume.
Here it is UC, but it about drove me nuts.
I had the scope on my Mustang adjusted for"dead on" at 100 yards with 300 grain Speer Gold Dots at 1700 fps, so I knew I would have to readjust it to get the Great Plains bullets on paper.
I had a box of twenty 385 grain GPs on hand, so I filled
ten powder vials with 90 grainsT-7 FFFG,
five vials with 90 grains Pyrodex RS, and
five with 90 grains Jim Shockey's Gold.
The plan was to use the first five of the T-7 loads to get on paper at 50 yards, and adjust the scope so the GPs were hitting 2' high there -which should put them pretty much near center at 100. So, I sighted in and got the last two of the "sight in"bullets excatly 2" above the bull at 50 yards. Those sight-in shotswere grouping so well that I expected really good groups at 100. Boy, was I wrong. Things went down hill from there.
Anyway, here arethe three 100 yard targets. What astounded me was how much the point of impact changed with different powders.