OK GK...forget the hostile @sshole like behavior briefly...you or anyone have any experience with the old(I don't knoew if its still made) Aguila SSS.22 lr?It was .22 short brass with a long for caliber 60 grain bullet on it to make it fit lr chambers.Was supposed to be pretty good in 1in9 barrels.Definitely would be cood in something like an M77 type .22 with a fast twist barrel,but AFAIK you had to use aftermarket barrels;in a convertible AR it might be useful. I recall it being originally conceived for suppressed .22 rifles,butI was/am curious about the wounding characteristics and hunting/poaching applications.In a bot rifle it would/could be pretty quiet.