Pretty much the same experience as flatwater bill. I've had two. One in 35 Whelen and the other in 35 Whelen AI. The AI was done because I discovered headspacing issues in the regular Whelen while shooting reduced cast bullet loads. Both were custom jobs on Rem 700s and using Shilen bbls w/ 14" twist. The AI was used and shot most extensively. The AI was not pushed very hard and certainly no more than about 2400 fps with regular cup and core bullets- mostly 250 gr Nosler Partitions. I worked mostly with the 250 gr Partitions as the rifle really liked that bullet! Accuracy was excellent and no surprises. I have no experience with the Whelen shooting TSXs or other monos.
Here's a pic of one of the best 100 yd, 5 shot groups I got with the AI. This was with the 250 gr Partition and N150 powder. I had very similar results using IMR 4350 powder- makes sense because they are very close in burn characteristics. I also discovered that N140 works but would quickly get squirrely near top end loads.
