Great info. I guess I am too unsure to go through load development and find out they won't perform as I want. Thanks again everyone.
You can load up both versions of NBTs and shoot them into a box of new phone books, catalogs or filled milk jugs and compare penetration. It will give you some idea if one version "blows" up sooner than the other.
I've done it before........
120grNBT vs 140grNBT Penetration TestThe very first edition of Nosler ballistic tips were not for close range...I can testify to that (my experience limited to .308 dia) in the '06.
So can I—it was kinda’ like shooting the poor critters with plastic tipped potato chips.........it was gruesome.
I shot at least 6-7 mule deer and several black bears with the first versions of 30cal 165gr NBT out of my first Browning ABolt in 30/06. Some of these deer were less than 50yds and one bear was very close about 10yds. These 165 NBTs were from several different batches bought in 1990 - 1992 labeled as the solid base. I know this well because I was shooting 150gr Sierra Game Kings in 1989 and switched to 165s after reading up on "The Perfect 165" by Dave Petzal. I remember one bear I had to shoot quickly over hounds at close range in thick brush. That 165NBT broke the bear's neck cleanly and it died instantly. Another bear treed up a lodge pole and quickly started coming down as we approached, about 50yds. I placed a 165 NBT right in his shoulder and he plummeted instantly, hit the frozen ground hard and layed to rest in a dry creek bed . No blow ups at all.
I loaded up the very first 180 NBTs (of which I still have a few) for a friend's 300Wtby in 1984. Later on a hunt I positioned him at the base of a granite rock slide at about 10,000ft elevation on the deer opener. I told him and another friend in the dark to wait and be ready when it got light. Well some cloud cover blew in and they got cold so they built a fire by a dead fall. After it got light several good bucks trotted right by them and headed up the rockslide less than 50yds, one of em said to shoot on three but the Weatherby shooter fired early killing his buck instantly, it reared up and fell backwards. No bullet blowup. The other 2 bucks turned and ran at them and the other guy missed, he was using a 30/40 Krag with a peep sight. I still have photos of that hunt in 1984. You can see how close the rock slide was from the shooter in the background:
![[Linked Image from i.ibb.co]](https://i.ibb.co/5Yfhywm/20210104-165709.jpg)
Same buck (middle) after the pack out with stock
![[Linked Image from i.ibb.co]](https://i.ibb.co/RQycvGr/1984-High-Land-Lakes-5-1.jpg)
Not saying the early NBTs didnt blow up but I was a very early user of them and never any issues. Also have killed a few animals with the early version 7mm 150gr NBT at both very close and long range with no issues at all in the 7RM.