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Re: 30-06 inherent accuracy
Rickshaw #18105183 02/06/23
Joined: Jul 2003
Posts: 1,330
ChrisF Offline
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ChrisF
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Joined: Jul 2003
Posts: 1,330
Quote
Are you sure there wasn't some other type of incompatibility besides jump? I've shot a very large number of good groups with .308" bullets jumping at or near 1/8" in several rifles.
Ya know...good question. I didn't do the "pull-push" as I did with the FGMM. ...and I don't have experience shooting the 178 ELD outside of that. I will say that the jump was probably a bit more than 1/8". The gap right now is time...but I'm thinking when I have some, a date with the puller and a stoney-point might be interesting.
BP-B2

Re: 30-06 inherent accuracy
ChrisF #18126225 02/11/23
Joined: Jun 2004
Posts: 41,667
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mathman Offline
Campfire 'Bwana
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mathman
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Originally Posted by ChrisF
Quote
Back when DCRA shooters had to use issue ammunition, there were all sorts of theories as to what made the best shooting barrel.

Since we're already off topic...might as well go whole hog!

I'll see your Canucks and raise you a Palma! Remember when the Palma matches were not only shot with ammo provided by the host country, but also with rifles provided by the host country! One year the Palma Matches were shot with M14's!!! But at least it wasn't an equipment race and all competitors had to center up with more less the same accuracy. Trying to gain an equipment edge has always been part of human nature. The Brits weight sorted their Bob Jensen issued ammo. They won that year. Coincidence? Story goes that Boots started cutting tightbore .298's because the British RG was all over the map on diameter. ...and squeezing them a skosh more gave better accuracy.

That said...with the other lengths they went through with the XBR's (ie etching the receiver instead of roll stamping it to avoid distortion) it's a mystery to me why Remington would chamber their factory BR rifle with a NATO reamer.

I went and got my 40XB-KS and it is marked 7.62 NATO. This evening I did a little checking and factory Federal Gold Medal match with 168 grain Match Kings loaded to 2.8" will have just shy of a 1/8" jump to engage the lands.

Mine looks like this one:

[Linked Image from gunsamerica.com]

"In the real world, think of the 6.5 Creedmoor as the modernized/standardized/optimized version of the 6.5x55/.260." John Barsness 2019
Re: 30-06 inherent accuracy
Rickshaw #18127381 02/12/23
Joined: Jul 2003
Posts: 1,330
ChrisF Offline
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ChrisF
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Joined: Jul 2003
Posts: 1,330
Nice rifle! While I'm not a 40X expert, I'm going to take a SWAG that it's a 90's or 20 ought rifle from the SS Receiver and the KS stock?

During that era, I do know that some PD's were using 40X's as sniper rifles, so it makes sense that a NATO chamber would be used as those were expected to digest all kinds of ammo. I'll chalk up the NATO chamber in the XBR as one of those "things that make you go hmmm?"

Quote
Bernchrest accuracy is a little different and I have a tight neck reamer (334) specifically for that.
greydog's statement just adds to the "hmmm"

Random question; Your rifle is sans clip slot right?

Last edited by ChrisF; 02/12/23.
Re: 30-06 inherent accuracy
ChrisF #18128576 02/12/23
Joined: Jun 2004
Posts: 41,667
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mathman Offline
Campfire 'Bwana
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Joined: Jun 2004
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I'm miles away from it right now and it has a rail on the top so a call to the woman at home won't get me an answer, but I think it has a clip slot.

I assembled some spec ammo last night and shot it this morning. I put a SWFA 6x42 milquad on it and after getting zeroed I shot two sub 1/2" five shot groups at 100 yards.

LC67 NM brass on its sixth loading, Rem 9 1/2, 41.5 gr IMR 4895 and a 168 gr Match King seated to the old 2.83" M852 spec length.

I did seat a couple long for the jump check and the rifling Mark's were very even and well aligned, so it seems like its generous chamber is in there straight.

"In the real world, think of the 6.5 Creedmoor as the modernized/standardized/optimized version of the 6.5x55/.260." John Barsness 2019
Re: 30-06 inherent accuracy
Rickshaw #18128693 02/12/23
Joined: Apr 2005
Posts: 29,561
USA
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jwp475 Offline
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jwp475
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Joined: Apr 2005
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168 grain TTSX 2950 FPS out of Kimber Classic Select Federal 215 primer, max load of Ramshot Hunter
Group shot at 200 yards


[Linked Image from i.postimg.cc]


[Linked Image from i.postimg.cc]


I got banned on another web site for a debate that happened on this site. That's a first
IC B2

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