It was refreshing. I spent a lot of time dialing in the M700 Classic 8x57; Trigger, striker, Alaska TI stock and bedding. That 8x57 Tikka was box stock and shot like that. The other untuned test loads shot well too.
However the Tikka which has a long throat did not like the 150 grain Hornady...
I'm inclined to agree. Attached is a known accurate load in two of my other modern 8x57's. First set sent down range. Untuned to the Tikka loaded in New Nosler cases. All I could say was, "Really?"
I only sort by head stamp and work loads in that particular head stamp. That can vary considerably. Example, the eight different brands of 8x57 brass I have range in weight from 157 grains (Hornady) to 187 grains (PMC).
Does it still shoot the same after the trigger and bedding job? It was factory ammunition. It will most likely do better with handloaded stuff.
I have to agree with Sunray's suggestion about a pressure point after you check the bedding. How's your bench technique. I've owned several M70...
I added a #1 butt stock to my #3 (30-40). Changes the whole feel and recoil characteristics, for the better, with properly loaded 30-40 rounds up to the Ruger's capability.
Since I only changed the butt stock I call it a Ruger 2.5
I wouldnt worry too much about unless you have a caliber with no load data published.
Give them a buzz. I had to do that with Alliant when working with Pro-2000mr in the 8x57. They said it ought to work great (lol) and 2000mr was a little slower than RL-15. It gave me a starting point. But...
IMR has loading data for both those powders in the 30-06 on their website. My choice would be 4451 for the '06. The 8x57, I have a feeling 4166 will be better.
Their online load data for 4166/8x57 shows some good starting points.
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