Sorry guys!!!!
I assigned someone to answer this while I was at shows..
The 35 Whelen BT is still in distribution and will be replaced by AccuBond sometime this fall.
It will be the same bullet in terms of loading.
The difference in bullet contruction can be viewed on the nosler.com website
http://nosler.com/partition.html
http://nosler.com/accubond.html
Expansion velocities can be viewed on our FAQ section
http://www.noslerreloading.com/phpbb2/v ... php?t=1347
Your gun is the only one that can tell...
The .338-180 grain Ballistic Tip is no longer in production as is the .338-200grain Ballistic Tip. However, the .338-200grain Ballistic Silvertip is still being produced.
The AccuBond will take the place of both in our line.