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January 16, 2001, 10:29 PM | #1 |
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Join Date: December 14, 2000
Posts: 50
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Bought a case and did more testing this afternoon.
From a Modified choke tube, keyholing appears to begin at about the 60 yard mark. From an Improved Cylinder, 70 yards. From an unchoked, approximately 90 yards. Note: By "begin", I mean that there is a noticeable gray smudge on the target left by what I'm assuming is the attached plastic wad (looks sort of like a penny and a dime standing side-by-side on their rims). Once keyholing begins, grouping degrades noticeably within 10 yards as it increases -- although I have not yet seen evidence of a full 90 degree yaw, probably due to residual weathercocking. Note 2: Attached wad slugs appear to be much more prone to choke sensitivity than Fosters. I've regularly gotten 4-6" 100 yard groups with a scoped 870 with a Mod tube w/Fed and Win slugs from prone or off a bench. Also, at 25 yards from a bench: Remington 870, 20" cantilever, 1X scope, factory Modified choke tube Federal "Tactical" Copper-Plated 00 (45 pellets total) Pellets in 12" Circle: 34 Pellets in 6" Circle: 19 Remington 870, 20" factory Improved Cylinder w/RS Federal "Tactical" Copper-Plated 00 (45 pellets total) Pellets in 12" Circle: 25 Pellets in 6" Circle: 11 |
January 16, 2001, 11:46 PM | #2 |
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Join Date: May 31, 1999
Location: Exiled, Fetid Swamp, DC
Posts: 7,548
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yo dood is that u?
where did yer web pages git too? Yer M17 page is a valued reference dZ [Edited by dZ on 01-17-2001 at 11:12 AM] |
January 17, 2001, 06:48 AM | #3 |
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Join Date: October 13, 1999
Location: Columbia, Md, USA
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Thanks for posting that, Laisse. I kinda wish you had used a rifled choke tube, but I think I'll do that next range day.
Does that 870 have a lengthened forcing cone? |
January 17, 2001, 08:41 AM | #4 |
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Join Date: December 14, 2000
Posts: 50
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Dave wrote:
>I kinda wish you had used a rifled choke tube I've not noticed any advantages when combining a rifled choke tube with the pre-rifled slugs (standard Brenneke, Fosters, etc.). They work GREAT with the sabot slugs, of course -- my gun averages 3" 5-rounders at 100 yards. The big problem with the rifled choke tubes is that they basically ruin buckshot performance, as shown below: Four rounds Federal "Tactical" 9-Pellet 00 Reduced Recoil (36 pellets total), 25 yards: Pellets in 12" Circle: 8 (22%) Pellets in 6" Circle: 1 (2%!) Those numbers = doughnut-shaped patterns. Note: A lot of folks refer to OVERALL group size, but that punishes load/choke combos which toss only one or two fliers. The 6" and 12" circles are a better method of tracking pattern density, the key to one-round effectiveness. It was used in the extensive American Rifleman article chewed over elsewhere, and using percentages makes it easier to compare apples to apples, and apples to oranges (e.g., #1 buck versus 00, etc.). >Does that 870 have a lengthened forcing cone? Both stock. One IC barrel with rifle sights, one #6231 cantilever with Mod choke tube. Seems I was either really lucky with the cantilever barrel (it is visibly MUCH smoother internally than the rifle-sighted barrel), or found an excellent batch of the Fed Tactical. Or both. And yes, that barrel groups better and more consistently with the Mod tube than an IC tube. A Full tube in the same barrel, however, is moving backwards. |
January 17, 2001, 06:26 PM | #5 |
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Join Date: October 13, 1999
Location: Columbia, Md, USA
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Thanks,Laisse. IMO, Modified must be hovering around the max constriction big shot will handle.Backing down to Skeet II is a possibility.
In Keith's dated but excellent tome, he mentions people seating a felt wad in the choke of their shotgun and using the size shot that lay in even layers in the choke. A bit extreme, but he knew long range shotgunning better than most anyone. Good point about bbl finish. Run a few thousand rounds through that RS bbl,and it'll be really smooth too(G)... |
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