Max.....thats pretty much the case with ALL projectiles (barring the varmit types and AMAX which are target so super thin jacketed) Ive pushed 125grn .30cal NBT at x39mm speeds with great results on deer and pigs...they sure as shit expand even at that speed....pushed out of .308 case they REALLY expand well,the thick rear jacket doest help hold it together a little.
the 130grn NBT is great lighter animal pill in .270......Ive shot quite a few reds with them...they arent flavour of the month for really big stags as THEY OPEN UP TOO FAST......
just saying your experience quite possibly ISNT the normal thing for NBT
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