County range is finally reopeneing at least on a limited basis. Tomorrow I expect to try out the loads derived here: Using Mule Deer's Rules in the 9.3x62 I'll report back! Cheers, Rex
I've actually had two range sessions with the 9.3x62 since posting the above. All the work with 2000-MR was on the first trip. Here is the short version: - I missed the velocity predictions by about 50 FPS with both the 286 Partition and the 250 NAB. - Pressures with both the "max" loads were about equal to the Lapua factory 286 Mega (based on CHE) - Accuracy with the 250 NAB/2000-MR was not quite as good as that from 250 NAB/Varget that I got on the first trip to the range with this rifle.
The long version: Attempting to use John's rules of thumb to replicate the success of 2000-MR in my 35 Whelen AI predicted ~67.8/2000-MR for ~2670 FPS with the 250 NAB, and ~63.5/2000-MR for ~2500 FPS with the 286 Partition. I worked up to both of those as follows and the velocities, group size, and CHE are also included (I measure to 4 decimal places with my blade mic for CHE - where 5 decimal places are shown, it's from averaging 3 rounds' CHE) Cases were new unfired Lapua, primers were CC!200, and all rounds were loaded to 3.375", which placed them over .200" off the lands in my long (standard) throat: Bullet Charge Vel./SD Group (100yd) CHE 286 PT 61.5 2329/3 1.50" .00073 " 62.5 2396/6 3.13" .0010 " 63.5 2440/13 1.86" .0009 250 AB 66 2542/14 1.66" .00067 " 67 2594/13 1.94" .00067 " 67.8 2621/15 0.95" .0008
EDIT: Sorry these look so sloppy - I had them all nice and neat with the right spaces, but those extra spaces were dumped when I hit "send"
Of note - I also took CHE on Lapua Factory 285 Mega, and it was .00083" with 2254 FPS and SD 19. - There were no traditional pressure signs. - No idea what happened to the second round of the second 286 PT it landed about 2 inches at 1:00 from all the other 286 PT rounds in the three groups. - It looks like it would take just about another grain to hit the target velocities, and I suspect the associated pressures would be fine based on CHE comparison to the factory stuff. I know CHE is not a stand-alone tool but I think it can be useful for comparisons when other factors are considered as well.
Hope this helps anyone wanting to use PP 2000-MR in the Nine-Three.
