just because the remington had half the powder as the other 2 doesnt mean anything..... I guarentee between the 3 loads not a one uses the same powder. different powders work differently and have different burn characteristics. for example if i reload 2 different loads of 38 special using the same case, bullet and primer but with different powders that have different charge weights but give me the same performance, with load number 1 if i use 3.9 grains of hodgdon clays powder which only fills about a 1/3 of the case I get 940 fps then with load number 2 I used 7 grains of alliant bluedot powder which fills about 3/4 of the case and got 945 fps. You see what im trying to explain? just because a powder charge visually looks like less doesnt mean it is less.