Excessive Throat Size: Ruger American Ranch .450 Bushmaster

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earlthegoat2

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I bought this rifle brand new last September in anticipation of the upcoming deer season in southern MI. I bought a few boxes each of Federal Power Shok 300 gr and Winchester Deer Season 250 gr.

Well, it shot patterns with both. I mean really bad. 4-5" groups @ 50 yds. 6-8" @ 100. These are supposed to be lights out accurate rifles in this cartridge. So, 1-2" @ 100. My Uncle has the Ruger American (regular rifle version) that does just that.....with Hornady 250 gr FTX.

I cannot find any FTXs right now and I couldnt then either. Hornady bullets are sized .452 so I thought that might make a difference. I was able to procure some Hornady 245 gr Interlocks that are used in one of their other 450 BM factory loads.

I am experienced hand loading factory type ammo following published loads and COALs. (Note: I have not loaded for 450 BM ever and only dabbled with it today.)

I decided to try to get the bullet as close to the rifling as I could also so I could eliminate that variable from the equation as well. I dont really know how to do this so I just seated a bullet very shallow in an unprimed casing. I placed it in the magazine of the rifle and chambered it very easily until I could lock the bolt down. I though it might get stuck in there and had a rod handy but as i eased the bolt back everything came out in one piece with no resistance so im pretty sure the bullet did not ride out of the casing upon extraction.

So the overall length of this round is 2.350 inches. The bullet may be only 1/4" into the case The Lee manual calls for 2.260 for max OAL. The factory Federal measures 2.153 and the Winchester 2.228

Am I dealing with an excessive throat and as such excessive jump to the lands of the rifling? Or maybe I am doing this process completely wrong?

Is this maybe a mixed blessing so I can run heavier bullets pushed out further into the leade with larger powder charges? (This is something I have little experience with just something I have read about)
 
I am gonna assume you verified the scope is not broken and it's secure? If any cartridge could break a scope with ease, it's the 450BM.
 
As per above check scope and mounts.

Do a chamber cast (cerrosafe available online). If the chamber is as capacious as your seating effort suggests (sounds like you did it right, but you won't know whether the bullet hung up and was pulled farther out of the case on extraction), that would seem out of SAAMI spec and it would need to go back to Ruger for replacement.
 
I am gonna assume you verified the scope is not broken and it's secure? If any cartridge could break a scope with ease, it's the 450BM.

I have done this. I went so far as to remove the Ruger factory rail and confirm torque of the base and used a few dabs of Loctite. I’m using Weaver Grand Slam rings so those are not junk. The scopes I used were Leupold. A 1-4x20 VX2 and a 1.5-5x20 Vari-X III. I torqued the action screws to factory spec also.


As per above check scope and mounts.

Do a chamber cast (cerrosafe available online). If the chamber is as capacious as your seating effort suggests (sounds like you did it right, but you won't know whether the bullet hung up and was pulled farther out of the case on extraction), that would seem out of SAAMI spec and it would need to go back to Ruger for replacement.

I have a bar of cerrosafe from slugging my bore on my 1894SS. I guess I will have to get on that.
 
Have you tried the shorter OAL as suggested by the load book? This shorter length will help build up pressure quicker giving a more complete burn.

No but I suppose I can.

You are suggesting making the cartridges to the max cartridge OAL that is in the manual?
 
One thing to check, I know you checked base and ring but check the wedges for the rings. From experience with the grand slam and leupold prw rings, the wedge things are centered metal and if over tightened they will snap. This can be hard to see without removing them.
 
(Note: I have not loaded for 450 BM ever and only dabbled with it today.)
I think I would try more load workups and use whatever bullet you choose manufacturer's recommended OAL and go from there. There are some guns that just don't like factory loads...
 
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