This weekend was not the best for load dev testing with the temps up at 29.2C with a humidity at 47% and reaching 32C later in the afternoon. Heat mirage was the driving factor making hard to get my reticle lined up dead on target
However I got some interesting results with this N555, My test rifle is a T3X Tac A1 with a 24" barrel, now with the load at 42.4 I was .2 gr of max recommended load according to Vihtavuori's load data that shows a max velocity of 2749fps at 42.6gr charge, the tests they publish is based on a 25 1/2" barrel. So at 42.4 I should be seeing around 2725 fps but I'm getting a max fps at 2681 so I'm guessing this might be based on a 25 1/2" barrel in their load data. I have heard that Tikka barrels tend to be slower for some reason. My seating depth is .030 off the lands, base to Ogive 2.304. Lapua SRP once fired brass annealed. The groups seem to get tighter near max at 42.4 gr charge with the SD's at 4 and ES at 10. I think more testing up at these max charge weights with no sign of pressures might get me were I should be. Comments are always welcomed.
However I got some interesting results with this N555, My test rifle is a T3X Tac A1 with a 24" barrel, now with the load at 42.4 I was .2 gr of max recommended load according to Vihtavuori's load data that shows a max velocity of 2749fps at 42.6gr charge, the tests they publish is based on a 25 1/2" barrel. So at 42.4 I should be seeing around 2725 fps but I'm getting a max fps at 2681 so I'm guessing this might be based on a 25 1/2" barrel in their load data. I have heard that Tikka barrels tend to be slower for some reason. My seating depth is .030 off the lands, base to Ogive 2.304. Lapua SRP once fired brass annealed. The groups seem to get tighter near max at 42.4 gr charge with the SD's at 4 and ES at 10. I think more testing up at these max charge weights with no sign of pressures might get me were I should be. Comments are always welcomed.
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