Full power load required to size brass?

[RPRNY]

In any event. No, full power loads are not needed to fire form. I like 14 grs of Alliant 410 topped up with cornmeal and sealed with a wax cap. Any light load of fast powder topped with cornmeal or COW will work well - the filler expands the brass effectively.

[4296]

Lyman Item # 2660299 303 RN GC 200 gr 314299

[Larry Gibson]

Okay, that's a good bullet. Yes 16 gr of 2400 may fire form the cases, especially if a Dacron filler is used. I suggest 18 gr with the bullet seated out so it is firmly seated against the leade when the cartridge is chambered. You may also want to slightly lube the cases so they don't stick to the chamber walls. You want the case head thrust against the bolt face so the case shoulder is blown forward to fire form.

[Eddie2002]

Get a 32 caliber mold for your model 99, I'm using a 100 grain .312 Lee mold and loading them as dropped over 5 or 6 grains of Bullseye, I use the .7 cc Lee powder dipper. It works great to fire form trimmed 30-06, 270 and even 8x57 brass to use as 7.7x58 brass. You only need a light load to move the brass and shooting plinkers is a ball out to about 50 yds.

[Wayne Smith]

Yup, item # and mold # are very different things. We typically use mold number here - thus the confusion. Thanks for clearing it up.

[Rcmaveric]

To make Grendel brass from 7.62X39 I just use my cast bullets and about 13g of 2400. Makes a nice plinking round for the kiddies to pop off for me.