HiBC, having loaded a few thousand single rounds in Garands, I've never noticed a problem with where the powders at in the case. After single round's loaded then pointing the muzzle down (powder goes right behind the bullet; space between powder and flash hole) or muzzle up (opposite powder position), never once did I notice any accuracy difference through 600 yards. Maybe 1/2 MOA difference at 1000 yards.
Powder position in Garand ammo causing problem's a myth for the most part. But you'll see a tiny difference testing it in a universal receiver for velocity and pressure. Forget about it. If you put a powder charge in a new (or full length sized) case and see how far it comes up below the neck, it's gonna be a few millimeters below the shoulder neck area for the most part. Hold that case horizontally and imagine that same space now distributed acorss the top of the round. The top of the level powder will be well above the flash hole as well as above the base of the bullet. Therefore, it's nye impossible to have a normally chambered round in a horizontally loaded Garand to have any powder at or below the flash hole. Only if one tilts the rifle down at about 40 some odd degrees will the powder move off from around the flash hole.
Get a glass or clear plastic tube with the same internal average diameter of a .30-06 case, cut it to length of a case from head to half way up the shoulder, put a standard charge of powder in it, then move it around at different angles and watch the powder move around noting the angle needed for the powder to not be at the tube's middle point at the high end where the flash hole is in a normal round.
Goodness, folks, this is really easy to figure out and learn what the realities are. If the powder's position in the case was so darned critical, how in the dickens did folks shooting 10-shot rapid fire (in 60 or 70 seconds) matches at 200 and 300 yards ever get all 10 shot holes on the target inside 4 inches; sometimes only 3 inches? For both of two 10-shot strings, too, in 20-shot rapid fire matches. They load the rifle with two rounds while standing with the muzzle up, then sit/lay down moving the rifle about getting it into their shoulder, then fire the first two shots. Reload with a full clip for the last eight shots.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master
Last edited by Bart B.; January 23, 2013 at 03:36 PM.