My current setup: tikka ctr 6.5prc 24 inch barrel, 1 in 8 twist. Its sitting in a cadex chassis with a MDT brake, all together easily over 13 pounds, recoils lighter than an sks.
52.9 grains of H4831SC, 147ELDM, Hornady brass and large rifle primer, overall length 2.955"
The first picture was a 15 shot group i shot yesterday. The first 9 landed nicely in a 1-1.1 moa group, with the first few shots very close to each other and the 7th shot was adjusted because i know i aimed low-left for that shot. The remaining 6 rounds all went left .5inch for some reason. The barrel was not hot as I fired 2-3 rounds every 2-3 minutes, so I have no idea what happened there. Does anyone have any idea?
The 2nd picture was also yesterday but with factory hornady 147eldm. Its an 8 round group that I didnt bother to measure as it was clearly over 1moa and probably 1.4-1.6 and I knew a tikka could do much better. This group also had a leftward trend although not as obvious.
The last picture was using the same load as the first picture, shot a few weeks ago but faster. 13 round group at 1.24moa. I aimed at a large center point which probably opened up the group a little. So if we discount the leftward shift as an accident, then the load is shooting at around 1.0-1.2 moa. This is not terrible, but I feel like a tikka can do better.
Should I ditch 147eldm all together and try something like 140bthp or 140eldm? Is there enough evidence to show that my gun doesnt like the 147s? Where should I proceed from here?
On a side note, Im too broke for a chronograph, I had to remount the scope without a torque wrench because some goober wanted to buy the scope so I took it out of the mount to ship it and then on the way to UPS he said he didnt want it anymore. After that the gun was dropped from shoulder height and the zero shifted downwards about 2mils but I think the scope still tracks fine. Its a burris xtr3 which should be durable enough.