i bought a warne xskel mount for my pst gen1 1-4. per the instructions, i mounted it as far forward on the upper receiver as possible. the rifle shot ok with a few different brands and weights, but i will be using fiocchi 55gr mostly (the "better" ammo i had on hand only shot marginally better than the fiocchi at all distances). zeroed at 50 yards, about a 1" group. 100 yards averaged between 2.5-3. not too bad for a ddmk18 10.3" sbr. after i figured out my come up for 300, i was hitting the 8" plate damn near every time. when i was packing up to leave i realized my scope was loose. my dumb ass never torqued it down (65in/lb)! i figured it wouldn't take long to confirm so i went back to 50 to check the zero. everything seemed ok. when i went to 100, i was getting 4-5" groups with all the different ammo. so yes, the groups doubled in size with the proper torque setting vs hand tight. WTF??? so i backed the torque setting to 45in/lb. same 4-5" groups with all of the different ammo. so for shits and giggles, i torqued the mount to finger tight. i was back to 2.5-3" groups at 100 and smacking the 300yd 8" plate. i thought that maybe the dd upper just doesn't like the mount in general. the next day, i took my ddmk18 and my RRA 16" upper to see how that did and to get dope on the RRA upper as well. same F-ing thing. i torqued the RRA upper to 65 with the mount all of the way forward and was all over the place. so i tried hand tight, and i was getting .5" groups at 50, and 1.5-2" groups at 100. WTF?
i ended up moving the mount back on both rifles about an 1" or so and torqued it to 65 to see if that would work and am able to get good groups, but now the rear of the scope is over the charging handle and the scope gets in the way.
all shots were taken off an atlas bipod and rear bag. i'd rather run the scope mount all the way forward so i have room to reach the charging handle, but don't trust it to hold up during a 2 gun match.
does anyone have any insight?
223 ammo:
fiocchi 55
hornady american gunner 55
hornady balck 62
hornady match 75 bthp
rifles:
ddmk18 10.3" 1:9 twist 5.56 chamber
rra 16" 1:7 twist 5.56 chamber
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