As noted earlier, I was a bit light in mag ammo so I toped it off some with 5 bricks of this Federal 30g H-shok "hoping" it would shoot nearly as well as my preferred Win Super X 40g jhp's. The Marlin 57M has all ways shot that ammo the most consistently but the Fed being on a pretty good sale, I took a untested chance that it would be acceptable.
The method of test was off my sand bag set up that I'v used for the passed 38 years. The scope is an old Bushnel Quad Power 2.5-10 that is paralaxed for 100 yards. My target range at this point is exactly 61 feet from muzzle to target. So, my group measurements will be with a dial caliper.
Each group is a 10 shot string with my Win Super X leading the 4 types since the rifle is sighted in with that particular round. The Remington 40g PSP was a top shooter for a friend of mine so I was eager to test that round here and it clearly more spoty that the Super X. By the time I put the Fed H-Shok in the gun, the 40 rounds fired had created some very noticeable heat mirage so I had to slow down and shoot the feds with a bit of air breeze when ever it happened to clear the POA. I was pleasantly surprised with these results. If that lone bottom left hit was not there, the Feds would have taken the lead by a .040 tighter group. As it was, that one round put in equal with the Remingtons despite the Rem's being far more choppy. Then theres the Win Varmint HV's. Thank fully, I only have about 5 or 6 boxes of this stuff. This particular batch is the "Thunderbolts" of mag rounds. I didn't have hi hopes for it since my last bench outing with a new to me Uberti 5.5" SAA, that showed very poor group consistency and even in this test I could actually hear a difference in the boom report between 2 or 3 of the rounds. Before shooting this last 10 round string, I let the barrel cool down. It clearly has potential and I may even try some out of a new batch in the future but for now, I'm going to stick with Super X in 40 and there was no mistake in buying the H-Shok in 30's.