They will feed just fine. Base, belt, etc are all the same. Length is close enough to not matter one to the other but all should be trimmed to a consistent lenght anyway. I have uses 7mmRemMg and 264 Win MAg brass to make 257WBY, 7mmRemMag to make 30 Belted Newton, lots of 300 H&H to make 300WBY back when the H&H stuff was lots more available and cheaper than the Roy stuff and I was younger and broker. Lots of fun interchanagle stuff out there when one knows what he is doing.
If you want to shoot that rifle a lot, even for varmints and practice you can load 40grs of AA5744 under whatever cheap bullet you have on hand from 125 grs on up and it will throw them out at about 2500fps with good accuracy and VERY low recoil.
Are you anywhere near Craig, Colorado? I used to love Elk hunting around that region.
LOVE God, LOVE your family, LOVE your country, LIKE guns and sports.
About 2016 team "R" candidates "We definitely need a crew with a sack of balls the size of hot water bottles, bloviated estrogen leaking feel-gooders need not apply." Gunner 500
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