Autorotate19
Well-Known Member
Iv just started reloading for my 300RUM and it has a 25.25" barrel. Iv been loading up some Retumbo for it. My question is with a 25.25" barrel will I get the most velocity out it or should I use maybe a little faster burning powder. I know most ultra mags have at least 26" barrels on them so it got me thinking if it would be a better idea to try H1000 or something faster? I dont have a chrony so I dont know my velocity and Iv been loading 210gr bergers and 200 accubonds. Any advice would be appreciated.
Thanks
Thanks