30-378 load

[Windtech1]

I'm loading for a 30-378 Accumark. I'm using Retumbo, Berger 185 VLD. Berger manual max load is 107.5 gr but only 3184 f/s. I want to reach speed top speeds, around 3400 f/s. I do not have a chronograph but do know how to look for overpressure. I'm hoping somebody would share previously worked loads for this specific rifle, powder, bullet combo.

 

[yobuck]

I dont think you can get there from here with a factory barrel legnth. Id say forget
max velocity and try heavier bullets which might get you closer.

 

[Windtech1]

Yes, I like heavy bullets, 210 VLD would be better, but not available when I looked -- Midway and Cheaper than dirt.

 

[Windtech1]

Used 110 gr Retumbo, 185 gr vld, Win LRmag primers. Got sub MOA @ 500 -- 3.75" group with a drop of 4 moa@500. 300yd zero and 2" high @100 yd. No chrono but using data in Berger ballistics estimated velocity is 3350f/s. Excellent load, zero pressure signs on primer or brass.