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Hello moosenuggets,
Congratulations on your Tikka. I feel fairly sure you'll really like it.
You've got one advantage over me right from the start. Your rifle has a 1 in 8" barrel twist. My Remington Classic, while a very good rifle has a 1 in 9" twist and is touchy with most 140gr. bullets. Some, such as the Sierra 140gr. HPBT it flat refuses to shoot well. I'm guessing it's the twist because this bullet merits praise from most quarters. The VihtaVouri 540, 550 and 560 powders are high intensity powders (you use less, higher velocity) and fairly recent on the market. I use the Lapua Scenar bullets mainly at the range. For hunting I prefer the Nosler 100 and 120gr. Balistic Tips and the Hornady 129gr. PSP. Like most bullets they group well in this rifle. Your 1 in 8" twist should handle the 140gr. bullets nicely. Best wishes.
Cal - Montreal
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