Kimber Adirondack load development

Riverboy

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So I picked up a Kimber in .308 a few weeks ago, a new Leupold VX2 3-9 x 33 ultralight, and put them together. I'm not sure how long that scope is going to live on the rifle, I may upgrade pretty soon. Anyhow, I figured I'd post this here as there is not a ton of information on these rifles, and also to get everyones thoughts and recommendations on bullet and powder choices.

So here she is


And against my other 'lightweight' a Sako 85 Finnlight in 30-06


I bought 50 new Nosler cases, primed with CCI BR2's, charged them up with varying weights of Varget, put some 150 gn Hornady SST's and went to the range to sight in, break in barrel, etc. I chose the 150 SST's because in my experience, SST's are pretty accurate, and relatively inexpensive. I have had mixed results using them for hunting. Anyway, the results were not very encouraging


The centre group was the max load according to the Lee book, and I thought I might be on the edge of something good. I had no pressure signs, so I loaded some more up a bit hotter, and shot them at 200 yards. Sorry no pictures, but the accuracy was appalling.

So since I didn't really intend to hunt with SST's, I started loading up Nosler Partitions. I realize that this is probably way overkill at the kind of speeds this rifle is producing, but why not ? I've never heard anyone say they were disappointed with the partition's performance, and once I get a load dialled in, I won't be firing that many shots with those bullets anyway. So I loaded up a bunch of different powders, and put 150 partitions on top of them.







So that's where I'm at now. I had my chrony out last time, so those numbers are speeds (for what they're worth), and grains of powder used. H4895 is looking good, as is VV N150. Varget, not so much. I'm sort of partial to powders that have a good temperature stability, hence Hodgsons, and VV. The Adirondack magazine box is 2.835 long, so I have been loading to a COAL of 2.810. With 150 SST's, this gives a .180 jump to the lands. I have .003 neck tension, and I am lightly crimping, as these will be hunting rounds, and crimped rounds make me feel all warm and fuzzy inside. I have not run into any pressure signs yet, so I will be loading a bit more H4895 and VV N150 and see how they do. I have 150 gn Hornady Interlock Flat Base, SST's, Nosler Partitions, as well as 165 gn SST's, !80 gn SST's, 168 gn Barnes TTSX's on hand. The TTSX's would be a bit silly to run in this rifle, as I am nowhere near the speed, and they eat up too much case capacity.

I should be able to shoot some more tomorrow, we'll see how it goes.

Edit, Not sure why I put this here, as opposed to the reloading section, but I did. Move it if you want.
 
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Sounds like you are in for a struggle here, how light is your trigger?
for what its worth I loaded 46 gr Varget behind a 150 gr interlock spritzer in a friends sons Kimber classic this week that shot really well. The seating depth was no where near the lands at 2.75", but speed was 2830 fps.
If it was me, I wouldn't crimp these loads either

Good luck.
 
My montana likes the 150sst touching the landes. I give it about .010 jam just to eliminate changes in ogive. No issues with length in the mag box. It also really opens up with anything close to max charge. I'm using 44gr of Win 748.

Make sure you check that the mag box isn't pinched. Assemble the rifle without the mag box spring...it should rattle just a little bit. I doubt you have a problem though...the 4895 ladder looks pretty good.
 
I would try some imr or h4350

Evan

308 Winchester is a terrible application for 4350

Light rifles are hard to shoot accurately...Load development can be frustrating! :) I would add enough H4895 under the bullet of choice to make decent speed. Load up a few dozen and just do some practice. Go kill things

my .02
 
308 Winchester is a terrible application for 4350

Light rifles are hard to shoot accurately...Load development can be frustrating! :) I would add enough H4895 under the bullet of choice to make decent speed. Load up a few dozen and just do some practice. Go kill things

my .02
This, and try it without crimping.
 
This is not my first lightweight, although it is by far the lightest. I may have been spoiled by my Sako 30-06, which will generally keep things under an inch at 200 yards. As I said, I will try without crimping.
 
Right on, seem like your making some progress. If all else fails, shoot a flat base bullet.
Pencil barrels: shoot 3 shot groups then allow to cool before you shoot the next ones. Shooting 5 is too much heat, maybe not for a 308 but 3 is always better imo.
 
308 Winchester is a terrible application for 4350

Light rifles are hard to shoot accurately...Load development can be frustrating! :) I would add enough H4895 under the bullet of choice to make decent speed. Load up a few dozen and just do some practice. Go kill things

my .02

Opps. I saw the 30-06 with the picture of his other rifle. You are most correct that 4350 is not suited for 308. I was always a fan of imr4895 and 165 nosler btips when I had a 308
 
Opps. I saw the 30-06 with the picture of his other rifle. You are most correct that 4350 is not suited for 308. I was always a fan of imr4895 and 165 nosler btips when I had a 308


On the 'Fire, shortactionsmoker has a great thread about accuracy tweaks on kimbers.

Incidentally, have you skim bedded it?
 
Buy a box of 150gr Federal Fusion to shoot as a control, my Adirondack .308 puts these into an inch. My next question and sorry if you answered it already and I didn't see it, is how fast are you shooting?

I posted this once recently and many disagreed, but my Adirondack definitely walks as it gets warm. The first two rounds touch or close, the next steps out, just the nature of a barrel that light and fine by me. Folks that would scoff at that I'd challenge to off hand gong ringing, the light little Kimbers hold effortlessly offhand.
 
Buy a box of 150gr Federal Fusion to shoot as a control, my Adirondack .308 puts these into an inch. My next question and sorry if you answered it already and I didn't see it, is how fast are you shooting?

I posted this once recently and many disagreed, but my Adirondack definitely walks as it gets warm. The first two rounds touch or close, the next steps out, just the nature of a barrel that light and fine by me. Folks that would scoff at that I'd challenge to off hand gong ringing, the light little Kimbers hold effortlessly offhand.

That is an excellent idea.
I am shooting fairly slowly, I'd say a minute between shots, but after 3 shots I have been letting the barrel cool fully. I'm shooting off bags too, not a sled or anything like that. I'm not really worried about the barrel walking around a bit as it gets hot, it's not a target gun. I would be pretty happy if I could get it to perform as yours does.
 
That is an excellent idea.
I am shooting fairly slowly, I'd say a minute between shots, but after 3 shots I have been letting the barrel cool fully. I'm shooting off bags too, not a sled or anything like that. I'm not really worried about the barrel walking around a bit as it gets hot, it's not a target gun. I would be pretty happy if I could get it to perform as yours does.
I prefer to shoot off bags. Try holding the barrel down just ahead of the scope with a little pressure, not too much. I don't allow the barrel to cool completely. I,m sure you will get moa accuracy with that rifle. cheers pete.
 
For the 20 minutes it takes, skim bedding will likely have a positive effect on it. A light barrel that walks shots as it heats up will often benefit...

None of my kimbers do anything other than shoot knots, and I'm trying my best to wear out tubes.

And all of mine had a learning curve as to hold. Snug into shoulder, weak side hand on fore stock. While none of mine are 'bench rifles', I'd not want to bet paycheques against me at distance with any of them...
 
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