Another 375 Ruger thread

[Bandera]

So I have started the load development process.
My plan was to use the Lead Sled to chrono the rounds. But getting the proper set up off the bench with the sled was not possible so I used the bags.
The starting point.
The factory Hornady 300 DGS advertises 2660 fps out of a 24”test barrel
My rifle averages 2550 with 23” barrel with the Hornady 300 Grain DGS load.
I have dialed in the velocity to an average of 2550 using the Barnes 300 grain TSX, H414 powder. This load is about 2 grains above the minimum listed load.

Accuracy testing is next. The initial results was all the loads where in a single hole at 50 yards. I had one flyer due to me pushing on the shot, but I knew it as soon as I took the shot. There will also be cold bore chrono shots.

With this load, the 375 should be staying above 2000 fps out to 220 yards carrying 2776 ft lbs. Not that I plan on shooting buffalo at that range.
At 50 yards this load is @ 2429 fps and 3930 fp lbs.

89 days to the hunt!

Initial 10 shot group while chronoing at 50 yards.

 

[375 Ruger Fan]

Very impressive results!

 

[Bandera]

Very impressive results!

Thanks. The 100 yard groups will be the telling data. I suspect they will group at MOA or better. The 375 Ruger seems to have decent accuracy potential.

I did possibly discover an interesting thing while on the bench.
I would chamber the round. Get a good mount on the rifle. Verify I was not going to shoot the chrono. Take the shot. On One of the shots I unknowingly let my mount on the rifle loosen up a bit. Took the shot, resulting in a very sharp pain in the shoulder, looked at the chrono, the shot was 25 fps slower. My speculation is that with the poor mount the rifle recoiled back faster resulting in reduced velocity. I did care to try verify that speculation.