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Go Big or Go Home Range Day |
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Goosic 
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Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8842 |
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 Topic: Go Big or Go Home Range DayPosted: February 06 2022 at 12:47pm |
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I took all three of the scoped Enfield's to the range this morning but forgot to bring targets. I only had one and only used it after I sighted in the rifles. I sighted in on the cardboard backer first and then taped up the target. (It should be noted that these were all shot at the 200 yard range.)
The first rifle used was the No4Mk1/2 scoped with a 8.5-32×50 Hammers. The ten shot group measures 2.53"×2.67" The second rifle used was the Faux L8A5T scoped with a BSA 24×44 target scope. The ten shot group measures 2.15"×2.01" The last rifle used is a No4Mk1 Long Branch with a donor 2 groove barrel and scoped with a Lucid 6-24×50. This one totally surprised me because what looks like only seven shots is actually seven shots in one large hole and three to the right. That ten shot group measures in at 1.33"×2.51" Not a bad day today I must confess...
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Goosic
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Posted: February 07 2022 at 4:35am |
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shiloh
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Posted: February 07 2022 at 5:27am |
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whats with the swirl marks on the last target, you shooting tracers at it... appears to match the rotation of the bullets, interesting.
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Goosic
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Posted: February 07 2022 at 6:38am |
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My only theory on that is the bullet and powder used.
The first two targets were hit with Sierra Matchking's, 174 and 168grn respectively using IMR4064. The Man in Black used Hornady BTHP .312 174grn bullets with Norma 202 powder.
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britrifles
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Posted: February 07 2022 at 8:20am |
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Interesting, I’ve not seen marks like this on a target. I can’t think of what would have made those marks…
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Shamu
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Posted: February 07 2022 at 8:45am |
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I've only ever seen it once. I was given some .30 cal 170 gr bullets for the 30-30, they were specifically marked that way, we reloaded them into .308 cases using 308 180 gr load data. Our assumption is we simply over-drove them to .308 velocities & they broke down in flight somehow. We retrieved a couple of them & there was a jacket, but almost no lead, we assume it melted somehow. Either from the hotter charge weight or the increased speed.
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Goosic
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Posted: February 07 2022 at 8:51am |
The first time I noticed this I had just sat down to sight in the rifle with the 2A1 Ishapore barrel installed. I was using Hornady 168grn HPBT with N202 powder. I was letting my daughter do the actual shooting and scope adjustments. Through the spotting scope it originally looked like the bullet was going sideways into the paper. It wasn't until we walked out to get a better look that we noticed the tiny vortex marks. My daughter thinks it is unburned powder residue...
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britrifles
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Posted: February 07 2022 at 8:59am |
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I thought too that’s what it might be, but I would not think it would carry out for 200 yards.
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Goosic
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Posted: February 07 2022 at 9:04am |
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Whatever the case may be, it does not affect the trajectories so I've just chalked it up to really cool imprints...
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britrifles
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Posted: February 07 2022 at 9:51am |
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And not all the bullets left that mark…a mystery for now.
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Goosic
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Posted: February 07 2022 at 9:55am |
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Just the Hornady projectiles using the Norma 202 powder.
The Sierra projectiles using IMR4064 left no marks...
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britrifles
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Posted: February 07 2022 at 10:04am |
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The 174 gr .312 Hornady BTHP Match bullet? I’ve got those and Norma 202, I will try it.
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Goosic
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Posted: February 07 2022 at 10:51am |
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I honestly believe it has something to do with the actual shape of the Hornady bullet.
In the photo you can see the difference between the Sierra on the top and the Hornady on the bottom. I marked the area in question.
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shiloh
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Posted: February 07 2022 at 11:57am |
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I mentioned tracers only because burning bullets will sometimes leave these marks....
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Goosic
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Posted: February 07 2022 at 12:18pm |
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I'm going back out in a couple of weeks to sight in my .243 and Ruger Gunsite Scout. I will also bring the No4Mk1/2 and the Faux L8A5T. This way I can run out the remaining 308 and 303 Hornady bullets with the N202 powder...
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britrifles
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Posted: February 07 2022 at 6:29pm |
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I may have found an explanation. I found a post on a forum with a very similar looking pattern from a pistol. The consensus is that the jacket is getting damaged in the bore and hot molten lead is leaking out from the core and showing up on the target. It’s usually only seen at short distances. If you have a borescope, check the barrel for traces of copper and/or lead. Also, look for a damaged land. It may show up right behind a lump or smear of copper.
Another explanation is the bullets are being driven at excessive speeds and getting damaged, but I really doubt that is the case with your loads. These bullets are typically good for speeds higher than .303 British loads. It can make the bullet unstable in severe cases. I’m not sure about the Hornady bullet, but the Sierra does have fairly thin jackets. You might have some defective bullets. I would hit the throat with some JB bore paste.  |
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britrifles wrote: