CCs are a measure of volume- like gallons. Grains are measure of weight- like pounds. 7ccs of lead will not weigh the same as 7cc of sugar. No way we can answer without knowing 7ccs of WHAT?
You're probably referring to gun powder. All gun powders are different. They don't all have the same density. You'd need to refer to the powder manufacturer for that conversion.
1.3 teaspoons.
If that is 7cc, then 2 and 6/7cc are needed. If it is 0.07cc, There are 285 and 0.05cc left over
How many grains equal 0.4mg ?
Pittman's Original OneStep 7cc ALR
7 ml
480 grains = 1 troy ounce.
49 grains more at freerice.com
5,303 grains = 0.343 kilograms.
2.268 grams = about 35 grains.
1/150 grains = 0.432 mg
1 mg equates to 0.015432 grains.
200 grains = about 12.959 grams.