Preferred bullet when reloading 6mm ARC & Why

[Old Bob]

I have a few reloads started with down-sized but not fire-formed Grendel brass. I'm using AA2520, Lever, CFE223 & SW Match powders & mostly Hornady 103gr ELD-X bullets but also have some with Nosler 100gr Partitions. I have AR-COMP & Win 748 I wanna try as well. Other bullets I've acquired are Berger 108gr Elite Hunter & 88gr varmint & Sierra 80gr varminters.

I've got over 200 rounds of resized brass I'm gonna fire-form before reloading for accuracy/velocity. Some of that brass is Lapua & AA Grendel brass, some are Remington brand 7.62x39 with small primer pockets & some are up-sized Lapua 220 Russian. I guess I'm gonna have to divide them up for shooting in my AR & bolt gun. I don't now how much difference there might be in the two rifle's chambers if any. I'll measure fired brass & figure it out. I've no doubt what works best in one rifle might not be as good in the other. I'll figure that out too...

But... due to unforeseen problems, I don't know when I'll be able to do any shooting at all. My brother had an accident on his bicycle last Sunday & will be laid up for quite awhile. He & I were taking turns caring for our 97 year old mom. Now, I'm having to take care of both of them. I don't know when I'll have any free time. I wanted to do some gold prospecting as well. Had to cancel that outing... Oh well, family comes first.

OB, What data are you using to start with SW Match Rifle powder?  One of the powders I actually have available.

My prayers go out to you and your family.  You appear to have your priorities in proper order.

BEL...

In the Shooters World manual the closest they have to 6mm ARC is 6mm Norma BR. The Match powder starting load they have is 25gr for all bullet weights. That case's volume is approximately 11% larger than the 6mm ARC case so to be sure I didn't load too hot I reduced the manual's load by 10%. So, with 103gr ELD-Xs, I started my load development at 22.5grs of SW Match & then increased my ladder by half grain increments to 23 & 23.5grs. If I don't have any pressure signs at 23.5, I'll load another ladder starting at 24grs. I might restrict this particular load to my bolt gun to start with. If all looks good, I might shoot some in my AR too.

Thanks for the prayers... much appreciated!