The paper target was hung in front of a steel drum and was suspended over the drum instead of flat against it. This had happened before with other cartridges when I shoot at a paper targets hung like that on the drum. Its a make shift 100yd target for me that I only occasionally use because I hardly ever shoot at 100yds any more. I usually shoot at 300, 400 & 500 yds at home. I have shot out to 500 with both 22 creedmoors and It has made it to the steel target everytime. Ive heard reports of SMK & ELDs blowing up in a 7 twist 22 creedmoor & 22-250 AI when pushed up to & beyond 3200 fps but it was all 4 groove or 3 groove barrels. Although there may be folks who have had blow ups from a 5R 7 twist, I haven't heard of any and shouldn't be any unless the barrel is toast or flawed.