Tikka CTR Mags with 6BR?

[Ackley Improved]

I had a few 6BRX cases laying around so I seated some 105's and loaded a Tikka CTR mag. With them loaded sitting forward in the mag they fed flawlessly. I don't have anymore than 5 dummy rounds so couldn't test with a full mag but has anyone had a play with this? If a spacer was put in the back of the mag I can't see why they wouldn't feed well although feeding the BR and improveds can be witch craft. Anyone had a play with this?

 

[260284]

I haven't messed with mine, but have considered a BR of some kind for my next barrel on my CTR. It would be nice to slide a spacer in and out of the mag to swap back and forth.