[Unclenick]

The club probably set it up for IPSC shooters trying to see if their ammo made Major for a match. For most semi-auto pistol loads you can get away with close screens, though 6 feet is the more commonly recommended first screen distance even for pistol.

The SAAMI standard setup uses 15 feet as the midpoint between screens.

We had a board member a year or so back who discovered his .338 Lapua Magnum had so much muzzle blast that he'd get false triggering even at 15 feet and had to go back to 18 feet.

The Sierra manual notes the barrel length of the carbine as 19", which makes it 11" shorter than the 30" rifle. I get about 260 fps difference between those barrel lengths with the 4064 load in QuickLOAD.