I have some 170 gr Remington Express Core-Lokt SP R8MSR 8mm Mauser ammunition. I think it's been discontinued according to the website.
A gunsmith said I can pull the .323 bullets and replace them with .318 for use in an old Mauser 88 Sporter that belonged to my Grandpa. This ammunition is supposedly loaded with a low enough charge that it works on the lower pressure action of the Mauser J/I.
I have the puller and .318 dies, but how do I find out what type of powder and primer was loaded in these at the factory? I'd like to weigh the powder when I pull the bullet and compare the weight with my load data for safety, then reuse it. I also have some brass and extra 170 gr .318 bullets, so I could recreate the same load if I knew which powder to buy.
(Standard load somewhere is around 42g of H4895 and CCI BR2 large rifle primers with 170g RN bullets and my spare brass is PPU brand. Around 40g for the 200gr RN bullets with everything else the same.)