For those long 6.5mm bullets a block of aluminum 1/2" thick 3" wide and the length you want along with some aluminum tig rods in 3/32 dia. Drill so there are 3 rods 1/2"- 3/4" long evenly spaced around each bullet.
Tools needed for this are drill press, 3/32 drill bit, center punch, pointed dividers, 6" file. lay out ink or marker, combination square, scribe.
Deburr the aluminum plate. this makes it easier to handle
Coat plate with layout ink.
With the square and scribe lay out a line 1" from end and a second down center length wise.
Set dividers to 3/4" lay start at center line intersection and work each way down lines these are the center holes for the bullets.
When all is right here lightly center punch the spots.
Now set dividers to .215 and mark circles for rods dias. this is 1/2 a bullet dia , 1/2 the rid dia and .015 for clearance. Draw these circles on each spot. you will end up with a
circle .430.
Here's where the dividers really shine by trial ad error set to "divide" the circle into 3 sections. start at the long lines and circle intersection. Lay out each circle.
Center punch each spot so the drill starts easily on location. be accurate here.
in the drill press drill the holes 3/4 of the way thru the plate.
Cut the tig wire into 3/4" lengths and lightly drive into holes or glue in.
The 3 fingers formed will hold the bullets up right and allow for heat and flow around them. They will make setting bullets in and taking them out easier. An option would be to drill the center of the 3 fingers out to 3/16" for a rod to push bullets out if needed.
MOA is a angular measurement. roughly 1 minute of a degree. Which is 1 .062XXX at 100yds it is not a constant as being angular it changes with distance. Roughly figured minute of angle is 1" at 100 yds, 2" at 200yds, 3" at 300 yds or when closer 1/2" at 50yds. It is a vee or funnel shape starting at the firing point and growing as the distance increases.