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Your 110 is a long action Maybe this will help (extract of bolt face diameter's courtesy of JE Customs)
Long actions with a bolt face .DIA of .470 +/-
220 Swift, 6mm Rem, 240 Weatherby Mag, 257 Roberts, 25-06 Rem,
6.5x55 Swedish, 270 Win, 7x57 Mauser, 7x64 Brenneke, 280 Rem, 30/06 Springfield,
8mm Mauser, 338/06 A Square, and the 35 Whelen.
Long actions with a bolt face .Dia of .540 +/-
257 Weatherby, 264 Win Mag, 270 weatherby Mag, 7mm Rem Mag, 7mm Weatherby Mag, 7 STW,
7mm Rem Ultra Mag, 300 H & H, 300 Win Mag, 300 Weatherby Mag, 300 RUM, 303 Brit,
8mm Rem Mag, 338 Win Mag, 340 Weatherby Mag, 338 RUM, 375 H & H, 375 Weatherby,
375 RUM, 416 Rem Mag, 458 Win Mag, and the 458 Lott.
You don't "need" a .300 Win Mag to for a 1000 yard competition unless you want to. You might want to consider the .264, .277, and .284 cals in a non-magnum chamberings; i.e. 6.5x284, 284 Win, .270/AI, .280/AI, etc ...
I have a .270 AI in Savage 110 LA with 30" Lilja SS, 1:8" 3-groove primarily to propel the 165/175 Matrix VLDs. My current accuracy load for the 175 is pushing 2993 FPS.
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