Range results from this morning:
Pre-stock change:
- 100 yard zero - 84F - No wind - ~2300' elevation
- FV-SR Tupperstock
- Millett TRS-1 4-16X30 - Set @10X - mil/mil
- Rock Jr front base - Small Caldwell rear bag
- Folding 'shooting table' (rickety, but better than freehand)
- Wolf Match Target and Federal Automatch
@100 yards:
0.87" Best 5-shot group
1.42" AVG 5-shot group
@50 yards:
0.64" Best 5-shot group
0.88" AVG 5-shot group
After-stock change:
- 100 yard zero - 57F - wind from 10 o'clock variable 5-15mph (more towards 15mph at end of session (see notes below) - ~2300' elevation
- Digital Desert 'TactiCool' pulled from MKII-TR
- DIP Bottom metal and trigger guard (final torque specs at 30" lbs-see notes)
- Millett TRS-1 4-16X30 - Set @10X - mil/mil
- Rock Jr front base - Small Caldwell rear bag
- Folding 'shooting table' (rickety, but better than freehand)
- Wolf Match Target and Federal Automatch
@100 yards:
1.63" Best 5-shot group
2.31" AVG 5-shot group
(Yeah, WTH?)
@50 yards:
0.36" Best 5-shot group
0.64" AVG 5-shot group
Knowing my first shots would be off from the original zero, I still placed a 100yard target just to see how 'off' it would be. Three 5-shot groups downrange with the base torque set at 20"lbs and rounds were all in the 8" target, but all over the place (had about 5MPH crosswind from 10 o'clock direction at this point).
Tightened up the torque to 25"lbs, group tightened up, again to 30"lbs and group tightened up again, but wind was now about 10mph, variable and rising, so I brought the target back in to 50 yards (exact 2MIL low hold at that range for my setup at 10X).
Adjusted 0.3 mil left for wind, and started again at 50 yards:
Now things were interesting. Groups were a good improvement over the tupperstock (see numbers, above). Consistently over 10 5-shot groups, the grouping was measurably better than they had been with with the tupperstock. Noticed that after every 2 5-shot groups that there was measurable loosening in the receiver bolt and front trigger guard bolt in that they would back out a bit and needed to be re-torqued back to 30"lbs.
Deciding to give it another whirl, I put the target back out at 100yards, but was still getting consistently worse groups than with the tupperstock (wind now up to 10-15mph variable from 10 o'clock direction). I'm going to have to take it back out on a still day for a good comparison.
Final 50 yard 5-shot group (2nd best of the day ~0.40):
One final item:
One thing that did improve and I am not sure how, was the 'first shot flyers' that I was getting previously. At my prior range sessions, my first shot from the magazine was always a 'flyer' usually 1 to 1.5" high and .5" left. All other rounds grouped fine, but every first round, zing! I've read others have had this issue and just lived with it.
Today, however, almost nothing. Looking from group to group, the first shot averaged a bit high and left, but nearly gone. Other than the stock change, I can't explain it. It simply was almost gone. I'm certainly not going to complain, just weird.
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