Flat vs cup based NSA Slugs

Thanks guys. I ordered some for some testing. I'm using 36.2gr flat base now and they are extremely accurate. I'm going to go up to 38s.... I had picked up some 42.5 and was getting over 60ft lbs - but my fps seemed to fluctuate. 1st 42 was 798fps and after 20 rounds I was down to 752. I actually forgot to look at my air, so I have to run another test with the 42s and see what I get with a full 300bar.



Cheers