Re: .308 1000 yards
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hummer</div><div class="ubbcode-body">SIG685, I shoot No 7 contour but not familiar with 7B. Longer cylinder section in front of action?
Yep the barrel is the heart of the game followed by what it is fed.
Is Broughton buttoned, hooked, broached?</div></div>
It was late last night when I answered and I made a mistake. The contour is the 7.9B and you can get the specs at Broughton's site,
www.rifle-barrel.net/barrels.html The barrel I got is buttoned in what is called a 5C rifling and the twist is 1:11.25.
The cylinder section is 6 inches which will allow me to rebore later on as the throat erodes.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">
I assume you have a tight neck and are neck turning and stress relieving. Are you shelf seating? If so by cutting or expanding?</div></div>
The neck is tight, I am not neck turning or stress relieving beyond the occasional Gin and Tonic. I'm sorry, I have no clue what you mean by "shelf seating", perhaps I know it under another name,
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">How much tension on the bullets 1/2 thou or less?</div></div> Right at 1 thousand.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Are you floating the size die?</div></div> No, but I do let the neck bushing float.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">FL die with bushing, how much body reduction. On 308 my reamers they cut a .4685/.469 body dim for LC cases. Necks on my reamers run .336,.339,.3405,.344 I have one jumbo reamer (SAAMI).</div></div>
Again, no magic here, I use a small base Redding full length bushing die.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I assume you are using big Sinclair bipod.</div></div>
That is a good assumption, yes I have the silver model for heat reflection in summertime. I've been using it now for 18 months.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Laminated stock? Factory wood? Pillars? Torque on action screws?
Tube stock?</div></div>
The stock is laminated, it is a Boyds Target/Varmint stock that has now been discontinued. The barrel is free floated from 3 inches forward of the bedded action.
[qhote]Seating in the lands or just off? How far?[/quote]
I seat the bullets 0.010 into the lands.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I use Wilson seaters and arbor presses for seating long range stuff.</div></div>
Redding for me in my old single stage press, I have measured the runout several times, it's minimal, when it is even measurable.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Ever measure bullet pull? How much pull do you like and how much variation do you allow?</div></div>
No.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">SD less that 4? How big a sample?</div></div>
Last time I measured the SD it was in the single digits. I'm not a slave to the chronometer, I am more concerned with the groups at long distance. I was studying my target at the last 600 yard match and there was no vertical dispersion to speak of, the group had horizontal dispersion only.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Clean every string? Or how many rounds?</div></div>
I used to clean after each match (66 rounds), but now I have stopped that and will consider cleaning again in a few matches. In my .223 LR rifle, I would go about 6 matches before a quick cleaning. The barrels are so smooth there is simply not copper accumulation to speak of. Still learning about the Broughton, accumulating information.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Use internal neck lube? What?</div></div>No.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Use external bullet lube? What?</div></div>Moly on the .223, but none on .308.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Polish case necks internally? Mine have mirror finish.</div></div> No. I can't get my hand to fin in there.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">How do you clean brass?</div></div>
Lyman vibrator with walnut and activator. Cases just do not get dirty in the bolt rifle.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">.001"shoulder bump on sizer?</div></div> Yes.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Do you use a MO Gage to adjust sizer?</div></div>I use a Stoney Point comparator measuring my fired cases and comparing to resized cases.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I assume you are sizing and not using expander button at all?</div></div>
Correct, my expander buttons are for sale on eBay. I do have mandrels in case a mouth is out of round. I treat my brass very gingerly.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Obviously you are uniforming flash holes and you don't have to worry about off center flash holes with Lapua. Least ways the Lapua I have seen have all been centered.</div></div>
I do not even uniform flash holes in Lapua. I do when I use Winchester or LC.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">The times I won the Palma Trophy I used Lapua but heads were so soft in 30.06 it was a one time loading and they wouldn't hold a primer.</div></div> I have Lapua cases with 5 loadings and still going strong. There was a nice study on .308 cases earlier this year in a magazine somewhere. They liked Lapua but recommended Winchester for cost/benefit purposes. I still prefer Lapua as LR is not really a cost/benefit thing, if you know what I mean.
[quoteThe hardness gradient requirement on NATO cases must be in effect for their 7.62, it sure didn't appear to be on 30.06 cases.
ll deg crown on Broughton? [/quote]
No, it's a recessed crown.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Who made your reamer? How much freebore? Neck dimension? Throat angle 1 degree?
Will fired cases still hold a bullet with case neck unsized?</div></div>
Not reliably, which is why I need to resize the neck, but it's very little.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">How much copper indent?
Is your striker indent dead center on the primers?</div></div>
It's smack in the middle. The bolt face had a bushing installed.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Now for the other question about what happened, no muzzle brake (as indicated not permitted) and no spongy recoil pad and no flubber. Come on guys, gotta be some exspurts out there that has had this happen or seen it happen. I have had it happen perhaps twice and seen it happen a couple times. The embarrassing part is everyone saw the rifle laying way out in front of firing line. </div></div>
I think you threw the rifle away because it shot so poorly. Or maybe it had a rocket assisted recoil compensating system that was thrown off quilter when the gyro-mounted spatial analyzer detected that you were holding the rifle incorrect;y and it activated the on-board GPS-guided flux capacitor to place the rifle out of (your) arms way.
Did I win?