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Posted: 6/30/2010 5:39:05 AM EDT
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I am attempting to find the length that would be touching the lands and then back it off 0.020 which is recommended for the particular round I am loading(barnes vg). My problem is that my measurements do not seem correct and I was hoping some of you guys could share with me your measurements so I can see if its a problem with my measurements or not.
I am loading .223 for a bushmaster ar15. The cartridge overall lenght where the bullet is right up against the lands that I keep getting is about 2.330 which is obviously way past fitting in the magazine. I am using the hornady lock-n-load measurement device. Could someone please post me what your numbers are? |
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That sounds about right. Distance to the lands has nothing at all to do with a cartridge fitting in the magazine. It's safe to say that if you're trying to minimize the jump to the lands, you're going to be single-loading your rounds. I'll see if I can find the post where I put up the numbers I came up with when I made the same measurements...
Found my numbers. Two uppers, both with Wylde chambers. 2.350" and 2.362". |
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Are you talking about the 50gr Varmint Grenade? That's such a short bullet, I can't imagine that you'd be able to load that as long as you're talking about. As you say, there just wouldn't be enough of it in the case. Maybe it'd be possible to load it .020 off the lands in a bolt gun with a real short leade, but in an AR? I can't see it.
ETA: I just checked the Barnes website load data, they recommend a COL of 2.200" for that bullet. |
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According to the load data on the Barnes site, the COL for the 36gr is even shorter, 2.190". There's no way they could recommend a 2.190 COL and recommend that it be seated .020" off the lands, the two are incompatible.
http://www.barnesbullets.com/wp-content/uploads/2008/01/223RemingtonWeb.pdf I'd try loading them to 2.190" and see what kind of results you get. Trying to load a bullet that short, that close to the lands, is not going to be possible. |
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This is a portion of the info I had saved that I was working off of.
223 Remington (36-grain Varmint Grenade) Reloading Data Printable Version Warning! Notes: Winchester cases and WSR primers used. Bullets were seated 0.020 inch off the lands. The 23.6-inch barrel had a one-in-12-inch rifling twist. (Handloader Issue #249 - October, 2007) Be Alert: Publisher cannot be responsible for errors in published load data. |
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Quoted:
This is a portion of the info I had saved that I was working off of. 223 Remington (36-grain Varmint Grenade) Reloading Data Printable Version Warning! Notes: Winchester cases and WSR primers used. Bullets were seated 0.020 inch off the lands. The 23.6-inch barrel had a one-in-12-inch rifling twist. (Handloader Issue #249 - October, 2007) Be Alert: Publisher cannot be responsible for errors in published load data. What you're learning is that every rifle is different and published information is barely a peek through a keyhole that can't cover all the variations and contingencies.. I'm surprised you have any bullet inside the case neck when seated to the lands in an off the rack AR. The other idea you'll learn soon enough is to trust your own experimentation when you start shooting this bullet. It might not shoot worth a crap seated to 2.19 inches COAL, and then again, it might shoot fine. It won't be the first bullet that shot very well with a long jump to the lands. In any case, it's more important to have the bullet seated to the proper depth into the case neck for correct neck tension - that would be about 1 caliber or a little more, although I expect this particular bullet has a very short driving band. You'll likely also encounter bullets that are too long to seat to magazine length. All of the 80 grain bullets and heavier and the 75 grain AMAX should be seated out long for single loading. The 77 grain MK is intended for loading to magazine length in AR's. So we have to take measurements while we load and trust our own good instinct, judgment, and experience, plus ask questions when needed. |
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Quoted:
This is a portion of the info I had saved that I was working off of. 223 Remington (36-grain Varmint Grenade) Reloading Data Printable Version Warning! Notes: Winchester cases and WSR primers used. Bullets were seated 0.020 inch off the lands. The 23.6-inch barrel had a one-in-12-inch rifling twist. (Handloader Issue #249 - October, 2007) Be Alert: Publisher cannot be responsible for errors in published load data. Maybe the guy had a barrel who's chamber was cut to that particular load combo and it was in fact .020" off the lands? If not, then there's a mistake, as others have said. Chris |
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