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Anyone ever build a 284 Win on Kimber Montana 84M?

I'd like to use a SA Montana but want a bit more zip than a 7mm-08. Somebody here must have done one of these........


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What bullet are you wanting to shoot? And how much more zip are you looking for?

It’s been said here that the action might not handle it, quick search will bring up the thread.

The 2.8 magbox would be the deal breaker for me with a .284 Win.

Last edited by Holston; 08/25/19.
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A.I. ?

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I'd like to shoot a 150 Nosler product - either the new Accubond or a Partition. I wouldn't rule out other bullets but those come readily to mind.


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Seems I wasn't the first one to think of this................

284 link


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I’m sure it could be done.

I know you said you wanted SA, so that rules the 84L out, have you thought about the WSMs?

I was kinda in the same boat, and went with the 8400. May be heavier than what you prefer, but it made more sense to me.

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I have an 8400 in a 30-06. I put it in a Pendleton stock. With a 3-9 Leup B&C reticle it weighs 7lb 1oz.


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Used to be a member here who went under the name headache who was a technician for Kimber.

According to him that cartridge was not doable in the 84, Had something to do with the amount of metal (lack thereof) surrounding the cartridge IIRC.


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The 284 Win case needs at least a mauser size magazine.
SA does not let you use the full potential of the 284 case.

SA usually means stay with the 308 case length or less.
I love my 284 and 6.5x284, but the 7-08 is a really good cartridge.


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The mag box limitation on the 84 would be a drawback.

A .284 on the long action 84L would allow for a custom throated barrel, with a longer mag box but there is already the .280 AI on that action.


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Yep. Why fupgk-around when you can get the 84L in 280AI and have plenty of mag space for 150/160 class bullets, a 24" barrel, and plenty of extra horsepower.


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Originally Posted by nyrifleman
Used to be a member here who went under the name headache who was a technician for Kimber.

According to him that cartridge was not doable in the 84, Had something to do with the amount of metal.


Headache (Pete, a friend of mine), was not a “technician”, he was Chief Design Engineer for Kimber... and before that he was, for several decades, Chief Design Engineer for USRAC and on the board of SAAMI. I’ve talked to him at length about the 284 on the Kimber... he says “don’t do it.”

Good enough for me.


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If it was me I would just find one in a 7mm WSM

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Originally Posted by WhelenAway
Yep. Why fupgk-around when you can get the 84L in 280AI and have plenty of mag space for 150/160 class bullets, a 24" barrel, and plenty of extra horsepower.


Yours must be different than mine.

I didn’t have enough mag space or ejection port for 150/160 class bullets.

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Get a wsm. If your lucky you may find a 7 wsm like I did. If not get a 270 or 325 wsm for cheap and have it barreled. I picked up a used 270 wsm last year in a Montana for under $700.

The WSM action has an almost 3" mapbox. The barrel also has a little more shank so a wide shouldered round has enough meat around it. Hold a 284 case next to a 7-08 Montana shank and you'll see where some of the concern comes from on that thin contour.

My 7 wsm is factory and shoots great.

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Originally Posted by Brad
Originally Posted by nyrifleman
Used to be a member here who went under the name headache who was a technician for Kimber.

According to him that cartridge was not doable in the 84, Had something to do with the amount of metal.


Headache (Pete, a friend of mine), was not a “technician”, he was Chief Design Engineer for Kimber... and before that he was, for several decades, Chief Design Engineer for USRAC and on the board of SAAMI. I’ve talked to him at length about the 284 on the Kimber... he says “don’t do it.”

Good enough for me.


Thanks Brad, I could not recall his actual title.

Holston, my .280 AI gets 3050 fps with RL26 and the 160 Accubond.

You only limitation I would be wary of is the 180ELD or VLD with the 1 in 9 twist.


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Wouldn't a 7-08AI be close to a 284? I would go that route if I wanted more zip in à SA than a 7-08 allowed.

Otherwise I i would go 280AI or one of the WSMs.

I wrote Kimber and their answer was that there was not enough metal to support the 284 case. IIRC, it mentioned bolt thrust.

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I second (or whatever it is) fitting something close on a 84M action. I shot mine this weekend and really am liking the rifle. I think it is a great gun.


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Originally Posted by WhelenAway
Yep. Why fupgk-around when you can get the 84L in 280AI and have plenty of mag space for 150/160 class bullets, a 24" barrel, and plenty of extra horsepower.


Originally Posted by Holston
Yours must be different than mine.

I didn’t have enough mag space or ejection port for 150/160 class bullets.



Originally Posted by nyrifleman
Holston, my .280 AI gets 3050 fps with RL26 and the 260 Accubond.

You only limitation I would be wary of is the 180ELD or VLD with the 1 in 9 twist.




I just followed nyrifleman's load development work, and no problem slinging 160AB (not 260 smile ) from the standard mag.

Last edited by WhelenAway; 08/25/19.

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Originally Posted by WhelenAway
Originally Posted by WhelenAway
Yep. Why fupgk-around when you can get the 84L in 280AI and have plenty of mag space for 150/160 class bullets, a 24" barrel, and plenty of extra horsepower.


Originally Posted by Holston
Yours must be different than mine.

I didn’t have enough mag space or ejection port for 150/160 class bullets.



Originally Posted by nyrifleman
Holston, my .280 AI gets 3050 fps with RL26 and the 260 Accubond.

You only limitation I would be wary of is the 180ELD or VLD with the 1 in 9 twist.




I just followed nyrifleman's load development work, and no problem slinging 160AB (not 260 smile ) from the standard mag.



Nosler made a special run of 7mm 260 Accubonds. BC is off the charts!

blush


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