Hi Fuj', The Sierra MK 150gr are from a pack that I bought during Covid, when it was really difficult to find my usual bullets and powders at anything approaching a reasonable price. H-4350 was simply impossible to find!

I got a few different brands and sizes at that point, and they've been quite interesting to experiment with. I've just been depleting my excess stocks. The groups have never been very good with these 150gr at any of the charge levels I tried, so I have no real interest in getting any more.

So far, my fave is the Hornady ELD Match 140gr, which seems to work really well in this rifle, with both H-4350 and RL16.

Ross.