https://www.youtube.com/watch?v=0Peruewv_0U
Here is the link to my boring 4 minute video I made this week end while converted Weaver S45 and S54 bases for some Firing line members.
"S" prefix means "steel".
#46 and #54 Weaver would be more standard, made from Aluminum alloy and anodized. These would be cheaper, but would sit higher.
I just got a message from a lurker asking me how I modified the V blocks.
I said I ground them by hand, but it was 10 years ago. I may have ground through the surface hardened steel and then milled trough the soft stuff with a carbide bit. I can't remember.
I measured a lot of rings to see how much clearance they need. Weaver Tactical 48355 take the most. I mill until the S46 is just flat and that has clearance for the 48355. I could mill off more for other less grabby rings.
Normally a 98 Mauser gets a #46 [0.860" hole spacing, thin base] in front and #45 [0.504" spacing, thick base] in the rear.
But the hight of the Dumoulin in the same in the front as the rear. The taller #45 has a countersink that is too deep.
So I use a #54 [0.504" hole spacing, thin base] that normally used on BAR rifles, not Mausers.