If you have the N570 and 195s you are good to go. I shoot the 180s using H1000, I used Retumbo with the 195s, my barrel did not like RL33. My barrel is getting swapped as we speak, so will get to do this all over again.
Good questions. I had a case when shooting down across a canyon, with a 20mph down draft wind. Don't think any app takes this into consideration that I know of.
The distance was 365 angle converted, yet the shot ended up about 18" low. I had to make quick adjustments to get the bull elk killed...
Yes, hard on barrels. But it looks pretty darn good compared to mine. Mine still shoots and looks awful after 600+ shots. I do use tubbs from time to time. I will try to upload a pic of mine, am on vacation right now, will see if works from Galápagos.
Got out today to finish up with the Retumbo ladder. 56.3 2931, 56.6 2982, 56.9 2960, 57.2 2990, 57.5 2991. Last 4 shots had slight ejector marks, and all were with in 1/2".
I am pretty sure the Cooper only has .110 of freebore. retumbo has really good accuracy potential. Temps today were around...
Today ran a ladder using Retumbo, started at 53.5gr 2818, 54.0 2866, 54.5 2899,
55.0 2881, 55.5 2892, 56.0 2911. I figured I would have hit pressure so didn't load up any further. Accuracy in the last 4 shots was a ragged hole. Will load up to 57.5 for next trip to the range.
I am at 600-700 and have shot similar loads as yours. Mostly shot the 195s, but have stopped due to heavy firecracking in the throat. Rifle still shoots the 175/180s very well 3130ish ragged hole so will continue on before re-barrels.