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IIRC, brass is made by Hornady and is reputed to be poor quality. It’s a good cartridge in theory but has largely failed to gain traction due to poor brass quality.

I would go 7BM ratter that RM if I was to build another too.

Dave Ward in Dovedale does. He’s doing one for me as we speak - 7-08 to .284 Win. The last one he did shoots 162s ELD-X into .5 MOA 5 shot groups. He knows what he’s doing.

Cancel that - absolute rubbish. Getting my rifles confused. It’s either impending senility or I have too many rifles.

My long throated 7RM has a COAL of 91mm, which leaves around 2mm of space in the standard T3 magazine. 7BM would give you more still.

That’s a good enough reason - it’s your rifle after all.

Good luck whatever you decide on.

.......... and talk to Kiwi Greg. He has a huge variety of 7mm ways to deplete your bank account.

Some good advice above.

T3s are great donors for custom or semi-custom builds, but not ideal for magnum cartridges. The action is not really strong enough, the magazine is too short, the barrels...