Home Forums Lever Action Central Big Bore Levers BLR 450 Marlin Mag box inside measurements???

hey guys---anyone have a 450 marlin Blr mag box handy? Been thinking of buying a 450 blr so that I might use a Speer 350gr MTSP bullet that is just too long for my 1895 marlin. I'd appreciate an inside the box measurement, across the top of the follower lengthwise. I know if I seat the bullet out I'd also have to throat out the chamber to accept the additional length but that's easy enough to get done. I called three different "gun" shops that are advertising the Blr for sale and" no calipers available" and even "what are calipers"? from one of them. When I called the Browning "Tech" dept, they told me I'd have to call the factory in Japan to get the measurement. I know, I didn't believe it at first either.....
thanks

I get 2.639" from the inside rear wall to the spacer at the front. If you could remove that spacer and go all the way to the front wall you have a total of 2.966" at the top.....it tapers wider towards the bottom.