Originally Posted by idaho elk hunter
I must admit the OTM is one I have not tried. It does have thicker jackets on it but is not intended for hunting. I for this reason will not use it. I do not know if it would open up at longer ranges. The Hunting bullet I have found has severe problems when pushed to the velocity that the 338-378 can achieve. The 300s that I have ran have gone into the 3100 range, You can do this and the case last 3 loads. The bullet and barrel needs to be hex coated as well as my lands are at a 1 degree 30 entrance. You have to shoot these one at a time like a single shot due to the fact the powder is a compressed charge to the point at a 3.8 coal it will distort the bullet upon pressing into the case. Retumbo is good but there are better powders for velocity. Accuracy depends on the rifle but I have found Rl 25 is hard to beat. RL 33 is great and N570 is ok, All HAVE to be ignited by a WN MAG PRIMER. They are hotter than the famed old 215. Your fps will go up as much as 40 fps. RL 25 loads should be worked up for pressure at the temp that you think you will be using them at, it is not extruded, therefore not temp stable. One could keep it close the 98.6 degrees areas on there bodys and eliminate this issue. Can someone reply with facts and actual pictures of the OTM hunting abilities at close and long ranges. I would like pictures due to the internet has made to many people experts overnight. Pictures are fact not internet talk
3100 is smoking for the caliber, what elevation? I load for a stock Weatherby with 26 inch barrel and custom with a 27 inch tube, never got close to that velocity with H-1000, Retumbo or Reloader. Reloader powders spike big time in heat (I live in the desert). Not fond of single loading cartridges in a hunting rifle, on the bench sure, carrying in the Feild no thanks. Best accuracy/least extreme has been with CCI. Have used Winchesters on older cases for practice on occasion as they seat tighter, work fine, have not chronoed any increase in velocity. I'm getting 8 loads out of brass. Started with the Elite Hunters now they are hard to come by. Will see how the OTMs work on Elk, Mulies and Nilgi this fall.
Longtimelongranger has done a ton of work with the caliber using the now unavailable 870, learned a lot from his posts/messages.