Magazine limiting COL

[UnSafe]

Rifle- Browning A Bolt II, 300 Win Mag.
I've had this rifle for a while now, and have been seating bullets out farther, in the search for accuracy with specific bullets. There's a cast metal insert within the magazine that limits COL, so with these longer rounds, it's a single shot rifle...
Has anyone opened the forward edge of this insert up? Not very technically demanding, a die grinder followed by a file would do the job, but I suspect that other gun nuts with Stony Point gages have worked past this obstacle and have experience worth sharing. The mag insert limits forward travel by blocking the shoulder of the cartridge, so recoil induced battering isn't an issue.

 

[HankL]

Browning uses the magazine filler as the feed ramp as well. One thing to be aware of is that the part is held in place by a rivet whose head may be removed by the die grinder.
HTH

 

[Richard.Howe]

Wow, someone who actually had the exact-same problem I did. Check out these threads:

http://www.thehighroad.org/showthread.php?t=108726&highlight=oal+magazine

http://www.thehighroad.org/showthread.php?t=69939&highlight=oal+magazine

I wound up using a shorter bullet.

Rich

 

[UnSafe]

Thanks for the replies. So I'm not the only one to face the mag insert dilemma. I'm considering a mag insert trim and top edge/ ramp bevel job, but will make one more trip to the range to confirm the accuracy of my latest long COL load- 180gr Nosler BT over 80.5 gr of H1000, WLRM primers in neck sized brass, seated to 0.060" off the lands, from my rifle. It might sound silly that I'm apprehensive about possibly trashing a $30 mag, but never (Usually) blink when blasting the same amount of money out the barrel..
If I do it and it works, I'll post a pic of the modification.