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New member.. Kimber 8400 300WSM accuracy??

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Unread 09-14-2009, 10:54 PM
Junior Member
Join Date: Dec 2008
Posts: 9
Re: New member.. Kimber 8400 300WSM accuracy??

CAUTION when considering Tubbs Final Finish!!
I just used their system on my Remington 257 Roberts. As far as the before/after on my pet loads is concerned, overall length 2.960 before and 3.038 after.
Yes, the cartridges need to be .078 longer to touch the lands now. Haven't worked on a new load yet but that is taking a LOT of metal out of the throat.
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Unread 11-27-2010, 02:47 PM
Junior Member
Join Date: Dec 2002
Posts: 29
Re: New member.. Kimber 8400 300WSM accuracy??

Try different bullet weights. One of my rifles shoots 150 grain bullets into 1 hole, yet the same rifle shoots 2" + groups with 165 grain bullets no matter what I do with the load combination.
Semper Fi
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Unread 12-25-2011, 01:24 PM
Junior Member
Join Date: Dec 2011
Posts: 1
Re: New member.. Kimber 8400 300WSM accuracy??

For anyone who is not familiar with Hill Country Rifle,I have had 3 accurizing jobs and one rebarrel. Overall I am very satisfied with the results. My Browning A bolt in micromedalian rebarreled with a Lilja 22 " barrel to a 7mm-08 Ackley improved is now a one holer even when fire forming brass!! It does not care what bullet type or weight is used. I have a Kimber Super America 7mm Remington mag accurized. It consistently shoots under an inch, but more importantly if I were to shot one shot per year at the same target it still groups under and inch. It is extremely stable over the long haul which I find incredible for a wood stocked rifle. I have not had to change the scope adjustment in over 5 years. Also had a Belgian Browning in 30-06 accurized. Same great results. When the 300WSM came out I bought a Browning A-bolt and sent the rifle to them. They built me a 7mm WSM before the caliber was even released. I had to invent my own load data. This gun consistently groups .5" to .75" with Swift A frame bullets which while, great terminal performers are not match grade bullets. I prefer them for hunting so I am willing to sacrifice a little on paper. There is no other company I would use at this point as they have performed so well. By the way, this is not a "paid political announcement" I just feel that they deserve the cudos based on the way they have performed for me over the years.

Last edited by Ldigio21; 12-25-2011 at 01:26 PM. Reason: Misspelled words
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Unread 12-25-2011, 03:45 PM
Silver Member
Join Date: Oct 2011
Location: Bend, Or
Posts: 429
Re: New member.. Kimber 8400 300WSM accuracy??

HCR won't touch a Kimber now days.
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Unread 02-16-2012, 12:31 AM
ERH ERH is offline
Junior Member
Join Date: Jun 2011
Location: New Hampshire
Posts: 7
Re: New member.. Kimber 8400 300WSM accuracy??

First..Great Question!
The 300 WSM is a great cartridge. The 8400 is an excellent rifle. I own a Kimber 8400 Select Grade in .338 Win Mag. I love its looks. I have been able to get 1 inch groups with hand loaded 180g Nosler AccuBonds but larger bullets like the 200, 225 and 250g bullets do spread out to as far as 1.25 to 1.75 inches at 100 yards as bullet weight increases. The 250g AccuBond in .338 can kill almost equally as well, a Cape Buff as a 300g .375 H & H Magnum as the point blank energy is virtually identical at 4000 ft-lbs but can kill a Muley Buck with 180g heads at 500 yards shooting MOA 180g heads. The shooter has the most built in error at that range with adrenaline, poor rests, lack of practice at that range. How good are you? Scope? Magnification? Bench rest gear etc.
The 8400 rifle is lighter than most and the barrel is pencil thin so carrying less weight is a reason to buy if you are a mountain hunter or one who is carrying all day long.
I was, like you, initially disappointed for the dollar spent in getting worse than MOA for the heavier bullets. And not even sub MOA for any hand loaded bullet.

It is important to note that most new rifles will improve in accuracy over time and need more than 100 rounds shot to accurize a rifle. Cleaning and shooting after each session is essential. I would Google Breaking in a new rifle to see techniques you might use on your Kimber.

Dwight Van Brunt says that because the barrel is thinner you will have to let the barrel cool between shots and my barrel does heat up fast so he says first shots count more in accuracy.
No question my 8400 is very beautiful but it does not appear to perform at a sub moa level when repeat shots are taken with my caliber and limited experience with the 8400. Bull barrels on other rifle brands absorb heat and deliver more accuracy but are heavy as heck to tote in the high mountains. My sons Savage Model 10 in .308 Winchester, heavy as heck bull barrel with an accutrigger shoots 3/4 to 7/8 groups with 140g Sierra HP hand-loads but is not in the same league at all for delivered energy. Too heavy for deer hunting all day in the field.

That said, you can spend more money and get guaranteed sub-MOA on the same kind of 8400 weight gun and get really good performance as guaranteed sub-MOA three shot groups. I have found that the simms vibration laboratory barrel dampener does reduce group size by a sizable margin on my 8400 with 200g Nosler e-tips from 1.5 inches to 1 1/8 inches.

I will say this on rifle accuracy, when you find a rifle that shoots sub-MOA groups for most of the ammo you shoot, then treat it like gold. I have a Ruger M77 Hawkeye African in .375 Ruger that shoots 260 grain Nosler AccuBond bullets in 5/8 inch groups at full power loads at 100 yards. I have to load down for deer and accuracy changes little. I am afraid there is no equal to this rifle without giant dollars being spent.
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Unread 02-16-2012, 02:07 AM
Bronze Member
Join Date: Jul 2009
Posts: 61
Re: New member.. Kimber 8400 300WSM accuracy??

I have a Montana 8400 in 300 WSM. And here is what has worked for me.

The bedding on the rifle is crap, it is bedded, but they used a slave action instead of your actual action. When you look at it, you might see pieces of paint and bedding flaking off. Also, when you have the rifle rebedded, make sure that the magazine box isn't being compressed between the stock and the action.

Have the trigger weight adjusted down. I currently have mine adjusted to 13oz and i like it alot. I've tested it by banging the rifle around a lot and ive never had it go off accidentally. Either way, I still don't load a round in the chamber until I'm ready to shoot.

Make sure you torque the ation bolts down in the correct order. The front one first and then the back one. I torqued mine to 50 inch pounds.

At first I had the kimber/ Leupold based and leupold rings. I feel that I had to much movement with these so I Purchased a Ken Farrel aluminum rail and Warne low rings and it is now rock solid. Unfortunately, this leaves the scope a little high, so a good cheek weld can be tough. You might try an aftermarket cheek piece.

If you decide to reload, the 180 grains accubonds and the 168 grain Barnes tsx/ ttsx work great. Both bullets shot great with 62 grains of IMR 4350, Winchester brass and fed 215m primers ( 1/2" to 3/4" groups @ 100 yards). I've tried other bullets without much success and these bullets were recommended by a kimber tech.

The gun is very light and has a lot of vertical recoil, so if weight isn't an issue add a Harris bipod. This made the recoil more enjoyable. Also make that you hold the rifle the exact same way every time you shoot for groups. And since the barrel is so thin, wait ten minutes between shots this way your barrel has a chance to cool completly.

If your still not having succes try jb bore past. This was recommended by a tech at kimber and it worked well.

Please forget the typos, I used my iPhone for this post.
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Unread 02-18-2012, 09:25 AM
ERH ERH is offline
Junior Member
Join Date: Jun 2011
Location: New Hampshire
Posts: 7
Re: New member.. Kimber 8400 300WSM accuracy??

I would be interested in what a Gun Smith would say on the Bedding of the 8400 since Kimber touts a superior bedding. I shall investigate.

Bolt torque is important and the sequence is also important. I have a torque wrench that I bought for my Ruger M77 to ensure the main lug is factory spec.

Trigger pull for target can be as low as you have it but in the woods with cold fingers, 3 pounds allows enough feel and is widely supported by veteran hunters for a multitude of reasons. Most rifle triggers break above 5 pounds and are responsible for many inaccuracies as is flinching. I always wear a shoulder pad at the bench. I use a Lyman Electronic Trigger Pull gauge to check trigger weight. It is the best tool for this.
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