Over the years i have culled a number of deer on farms in ireland where thoroughbred horses were being disturbed.One was an in-foal irish grand national winning mare, who was being harried by a lone red stag in the rut. Recently my name has been given to two places where the individual values of the bloodstock could well be into 6 figure sums. My current set up is a M 03 6.5 x 55 with a T8 moderator, using hornady 140 grain factory loads. Bearing in mind that the minimum legal requirement in ireland is a rifle of not less than .22 calibre with a muzzle energy of not less than 1,700 fps using a minimum bullet weight of 55 grains, are there any opinions out there on reducing noise levels to a minimum. I've worked with horses all my life and they are not particularly bothered by loud noises. Fast moving animals that can jump in and out of their paddocks are a different matter. The noise reduction is more to reduce the concern of management & owners. I was recently impressed by a friends .243 & T8 combination which from behind sounded like an unmoderated .22.