Gunsmithing Remington 700 300 Ultra Mag Long Action DBM

I have a remington 700 300 ultra mag that has a blueprinted action ,30 inch bull barrel ,worked trigger amongst many other goodies jobs and things.
I have a HS precision tatical thumbhole stock and want to fit a DBM that takes up to 9 round mags.
I recently purchased the Wyatt DBM ,two 9 round Mags and one 5 round mag .Only to find that the bottom metal will not allow the mag to seat high enough or forward enough for the bolt to pick up the round.:mad: Wish it was right.
I do not want to compromise the action or bolt travel by machining metal away. I would like to purchase the correct bottom metal for the job with twin locking lugs or a very reliable system to hold the mags. Precision final fitting by my smith is to be expected.
As this has not been built on the magnum action I am having a lot of trouble finding what I need in Australia.
Who can help me get this sorted I don't want to junk it up now?
What companies and or products can be supplied to finish this build
 
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