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M16a4 ACOG and Ammo Test. Some M1a/M14 time as well.
Another trip to the plate range, with the same idea as the previous thread- Do the sight markings in the scope or built into the iron sights make usable references for quickly engaging targets at various distances?
(The 200yd plate was not up in the previous thread)
Link to first test using a TA31RCO-M150 atop a Knight's SR15 E3 IWS and PRVI 75gr match ammo:
https://www.milsurps.com/showthread.php?t=24883
Quite frankly, it's a real challenge to see the white plates w/ iron sights at times, but the previous week's excursion by myself and WBS2111 showed that it's do-able. In that instance we were using my "Insta-sniper" 1903 Springfield that was, ummm, strangely w/o it's Warner and Swayze scope, and a mismatched byf 42 K98k
w/ a super bore. At 300 and 400 yards the plates were quite invisible to me, but that didn't impede hitting them- as long as other visual cues were used when aiming to put the sights where I thought they were "supposed to go". Hence my new signature (stolen from a fellow on brianenos.com ) "Targets are illusions".
More on those rifles in a future thread!
This week, the primary test concerns the compatability of the Ta31RCO-A4 ACOG on a 20" barreled 1-7" twist Colt upper when using M855 (Prvi Partisan again) ammo. The lower varies from A4 specs in the lack of a fixed stock, and in this case, it lacks select fire parts. USMC approved Geissele FCG installed as I prefer a two stage trigger. Knight's RAS (non-free float) up front. Carry handle/ BUIS underneath as was commonly stowed in the field.
First, before real testing started, it was determined that the ammo used did NOT unduly harm the plates. In fact, the impacts showed far less damage than many of the existing "uber-magnum" strikes. (Some fellow seem to enjoy blasting away rather regularly w/ a .300 RUM!)
Two M855 hits- no damage
Another plate
Unfortunately, I wasn't the only one using the range today, so the only real photo I got of the plates was the one at 520yds.
Long story condensed:
As the range increased, the strikes got higher when using the cross marks in the scope. (actual photo to be added later- it's a "compressed" version of the TA31RCO-M150)
200 was easy
300- no dramas
400 had to hold the line at the bottom of the plate
500- Never got on target, apparently going over w/ no visible splashes on the backstop due to the recent rain- later a run out showed the high its in the dirt baackstop. Couldn't have been by much and may explain the dull thwacks heard as some bullets passed through the reinforced rubber hanger- oops!
520- as the target is larger, resting the 500 crosshair at the bottom of the plate worked, but still a bit high.
I'm thinking that the error is due to this being a range based on "yards", whilst the scope is graduated in meters, but hard proof, yet. Going to try again w/ some different ammo and see if there's any difference.
Accuracy definitely wasn't quite as good as the 75gr match in close, but, oddly, seemed perfectly acceptable at 520yds as further unphotographed shooting supported. Again, I'm not trying to go "sniper" here, just seeing how easy it is to get good field results.
More to follow on the M1a/M14 test, w/ South African R1M1 ball. (Mostly good results, actually!)
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Last edited by jmoore; 10-02-2010 at 04:51 PM.
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10-01-2010 08:17 PM
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Another rifle used- a much overworked and often modified Springfield Inc. M1A. Since it's last outing I have moved the lightened trigger group to a new project rifle, installed a "new" unitized gas block, and routed out the forend and ferrule to eliminate binding of the gas cylinder extention. After all that, I just plopped down, set the sights to "2", and smacked the plate at 200 yds with the first shot AND those following! I don't believe it myself... Even more amazingly amazing is that all it took to connect with the plates at whatever distance was to just dial the sights to one click less than the number maked on the elevation drum-(it's in meters and the range is in yards). Stupid easy.
As seen before (After it was a test bed for the Frankenrifle).
Current configuration
Had to use the fiberglass handguard as the wood one won't fit the front band. Plus, it was glued on as well...
the only 7.62 hit photographed, as company arrived at that point- this was a poor attempt to take a picture through the spotting scope at 400yds.
All this w/ it's usual diet of R1M1 South African ball ammo.
Gotta get back to the bullseye range and see if it groups better...!!!
Most fun rifle shot this day. It even seems to recoil less. Multi thousand rounds through it and it keeps getting better.
The Glen Nelson built rear lugged, heavy barrel rifle, however, was a complete mystery. Zeroed at the same range a few weeks previously by a friend w/ it's "new" scope and mount (It had a Brookfield Precision mount before this early Arms 18 unit), I could not make hits at all. ??? Bore sighting showed no dramas, so who knows? It hasn't been out of it's stock or anything, so I guess it'll have to go back to a short range venue to diagnose.
Don't know WHAT happened w/ this one. It's been very well behaved in the past
Sorry there's not more impact photos, but I ended up having to share the plates. It's also a great bother to have to drive down range at every rifle change- no foot path to the targets! (at least not yet)
Last edited by jmoore; 11-23-2010 at 08:04 AM.
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Hauled "F.B." (named after a certain large "Austin Powers" character) off to the 50 and 100 yard range after a bit of bore cleaning. First round at 50yds cut a leg off the "X", so out to the 100yd target w/o further adjustment. Two rounds there maybe 1-1 1/2" high left. No reason to miss the 200yd gong! 
Fine tuned a bit and shot a five shot group that's pretty good, using 168gr Federal Match. The scope was originally calibrated for M118SB (173gr bullet), but I only have one box of that long out of print ammo.
First and only round at 50yds. We generally use 25yd timed and rapid fire pistol targets out to 200yd.
The two high left hits were the first shots at 100. Adjusted the scope a bit and fired the last five seen rather nearer the POA.
Ran a few rounds out of the other M1A as well, (the iron sighted one) since the flash supressor assembly needed a little attention. It's really threatening to become my favorite GP rifle. Need to shoot a bunch of standing (again) and see if it can now compete w/ the "big" (that means stupidly heavy) AR. It hasn't ever quite scored as well , but neither does it tend to throw shots as badly when I mess up.
Iron sighted "light" M1a w/ milsurp ball ammo.
First round was out of a cleaned bore and hit right. The next few went left, so did a minor adjustment to center up the impacts. Again, using R1M1 ball ammo, GI barrel, no glass bedding, and the rifle had just been apart to address a bit of play in the FS.
Last edited by jmoore; 02-26-2011 at 06:29 PM.
Reason: Added cption to top of last photo to prevent confusion
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Oh, didn't photo this the first time, but here's an M855 hit on UNHARDENED steel at 520yds:
I'd painted it over a couple of times, plus whatever other folk did in the past week or so, but I'll take the blame. It's not as bad as the magnum hits someone made on the other bolt head.
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