For anyone looking at the 25GT, I started using one a couple months back. I got around 500 rounds on it now and a match under its belt (4th place finish at a regional 1 day prs match)
I haven't seen much in the way of load data so I figured I'd share what I've found so far. I keep this intentionally slow but it should give you an idea of where to start.
Barrel is a 28" Benchmark chambered by TS Customs with the alpha .180 reamer and installed by me on a Impact 737.
in the below image I am fire forming new 6mmGT Hornady brass and velocity tends to be about 15-20fps faster after the first firing.
Bullet being used in the above is a 135 Berger Hybrid jumping around .055", range notes 76 degrees, 67% 29.14 station pressure, little to no wind and time of day was 10 minutes before sunset through 20 minutes after... Limited on time, I had some pretty wicked mirage while shooting H4350 and RL-TS 15.5 coming off my shielded maverick and I know groups were affected but I was really more interested in velocities anyway... by the time I got to the loads with StaBall Match & 6.5 I had so little light left that I stopped for the night.
Garmin Xero used for velocity collection.
Top string is Varget
31.5: 2577, 2570, 2574 = 2574 SD 3.0/7.4 ES
32.0: 2599, 2602, 2596 = 2599 2.7/6.5
32.5: 2625, 2625, 2627 = 2626 1.1/2.4
33.0: 2657, 2649, 2654 = 2653 7.8/3.2
Middle string H4350, no compression was noted when seating these.
34.5: 2604, 2595, 2590 = 2596 5.6/13.3
35.0: 2639, 2642, 2642 = 2641 1.2/2.8
35.5: 2662, 2664, 2664 = 2663 1.1/2.6
36.0: 2698, 2685, 2696 = 2693 5.7/13.3
Bottom String Reloder TS-15.5
31.5: 2555, 2544, 2543 = 2548 5.3/11.6
32.0: 2572, 2580, 2578 = 2577 3.6/8.6
32.5: 2599, 2606, 2603 = 2603 2.7/6.6
33.0: 2621, 2621, 2629 = 2624 3.8/8.5
Different day with 135 Bergers Hybrids.
Vihtavuori N150 31.75gr 16 shots = 2632 SD 6.2/24 ES
32.75gr 4 shots = 2692 5.7/14.3
With 134 Hornady ELD seating same jump... .055ish
Vihtavuori N150 31.75gr 17 shots = 2610 SD 8.9/38.9 ES
I haven't seen much in the way of load data so I figured I'd share what I've found so far. I keep this intentionally slow but it should give you an idea of where to start.
Barrel is a 28" Benchmark chambered by TS Customs with the alpha .180 reamer and installed by me on a Impact 737.
in the below image I am fire forming new 6mmGT Hornady brass and velocity tends to be about 15-20fps faster after the first firing.
Bullet being used in the above is a 135 Berger Hybrid jumping around .055", range notes 76 degrees, 67% 29.14 station pressure, little to no wind and time of day was 10 minutes before sunset through 20 minutes after... Limited on time, I had some pretty wicked mirage while shooting H4350 and RL-TS 15.5 coming off my shielded maverick and I know groups were affected but I was really more interested in velocities anyway... by the time I got to the loads with StaBall Match & 6.5 I had so little light left that I stopped for the night.
Garmin Xero used for velocity collection.
Top string is Varget
31.5: 2577, 2570, 2574 = 2574 SD 3.0/7.4 ES
32.0: 2599, 2602, 2596 = 2599 2.7/6.5
32.5: 2625, 2625, 2627 = 2626 1.1/2.4
33.0: 2657, 2649, 2654 = 2653 7.8/3.2
Middle string H4350, no compression was noted when seating these.
34.5: 2604, 2595, 2590 = 2596 5.6/13.3
35.0: 2639, 2642, 2642 = 2641 1.2/2.8
35.5: 2662, 2664, 2664 = 2663 1.1/2.6
36.0: 2698, 2685, 2696 = 2693 5.7/13.3
Bottom String Reloder TS-15.5
31.5: 2555, 2544, 2543 = 2548 5.3/11.6
32.0: 2572, 2580, 2578 = 2577 3.6/8.6
32.5: 2599, 2606, 2603 = 2603 2.7/6.6
33.0: 2621, 2621, 2629 = 2624 3.8/8.5
Different day with 135 Bergers Hybrids.
Vihtavuori N150 31.75gr 16 shots = 2632 SD 6.2/24 ES
32.75gr 4 shots = 2692 5.7/14.3
With 134 Hornady ELD seating same jump... .055ish
Vihtavuori N150 31.75gr 17 shots = 2610 SD 8.9/38.9 ES
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