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300 RUM or 300 Jarrett

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Unread 08-14-2008, 11:17 PM
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Re: 300 RUM or 300 Jarrett

No you do not need a Wyatts magazine for 210 grain, perhaps you want one. I have a 338 Lapua that I load to 3.86 inches COAL with the 300 SMKs and my velocity is right where you'd expet it to be at the SAMMI COAL of 3.6 inches
range it,check the wind, dial in correction, aim and only one shot

Last edited by jwp475; 08-14-2008 at 11:24 PM.
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Unread 08-15-2008, 08:02 AM
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Re: 300 RUM or 300 Jarrett


I hate to be the barer of bad news but if your barrel is in fact a 5 groove, its NOT a Lilja barrel. Dan does not make any 5 groove barrels.

Not a big deal if it shoots well but its NOT a Lilja. He only has 3, 4 and 6 groove barrels in 30 cal.
Kirby Allen(50)

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Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

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Unread 08-15-2008, 12:28 PM
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Re: 300 RUM or 300 Jarrett

maybe I am wrong, but isn't the Jarrett a proprietary cartridge only chambered by Jarrett? His actions and his barrels too?

If so, it makes no sense to go to the extra expense of doing that versus off the shelf for less cost and more MV.

300 Jarretts are $40 box vs $20 for RUMs and the RUMS are available anywhere.

Building custom rifles, particularily barrel burners it is nice to have your own $140 reamer for any rebarrel where you know the dies will match perfectly.

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Unread 08-15-2008, 10:02 PM
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Join Date: Jun 2007
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Re: 300 RUM or 300 Jarrett


I'm sure you are right. I couldnt remember exactly how many grooves it was. I thought it was 5 but obviouly not. I know for a fact it is a lilja. My gunsmith had it in his shop and suggested it so I took it. I Guess its about 15 years old when dan was still doing all his own lapping. (so I'm told) I do know that it shoots AWESOME. thanks for the heads up. I wonder what it is now. hmmm
" People sleep peacably in their bed at night only because rough men stand ready to do violence on their behalf " - George Orwell

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Unread 08-16-2008, 11:48 PM
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Re: 300 RUM or 300 Jarrett

I bought a 300 RUM a few years ago in a Rem 700 LSS 26" 1 in 10". Its an awesome caliber to say the least. Very powerful and very, very accurate. I shot about 1200 rounds in 2 years through mine and burnt the barrel out, so I feel I have some helpfull information on the cartridge. I was getting 3200fps w/200g SMK's and AB's. I also shot the 210g VLD @ 3000fps because thats where it was most accurate at. I could push it to 3100, but the accuracy was not as good. I also shot the 220g SMK @3000 as well, that was a little hotter load, but accuracy was once again superb. All these loads were using H-1000 powder as thats what my rifle seemed to love from the start, so I never went any further. These bullets with H-1000 gave me great accuracy to 800 yards, usually around .75 MOA, for a factory sporter rifle, not to shabby, and if I was on my game, it would do .5 MOA. In my remington, I could seat all the above bullets to the lands and still use it as a repeater, which was a bonus. You dont need a wyatts extended magazine.

I would not build a 300 Jarret because of what everyone else has already stated. Why go the extra length, especially if your not gaining anything??? I personally dont see any reason to other then the already stated "WOW" or "cool" factor. However, the 300 RUM has its own "WOW" factor after shooting it for a couple years. I actually feel its a little to much gun for most circumstances and feel its better suited for shots no closer then 600 yards, this is just my opinion. I slammed a few cow and spike elk with that 200g AB doing 3200fps and it was quite impressive, from 75-525 yards, and it left fist size holes all the way through the shoulders and the elk simply didn't know what hit them. I also shot my biggest black bear to date at about 250 yards with the 200g SMK right behind the shoulder and he only went about 10 yards and was dead on arrival. Also got my farthest coyote kill at 775 yards, on the 2nd shot, with the 200g SMK.

The 300 RUM is an awesome caliber and I dont think you'd be dissappointed with it. Good luck with whichever way you decide to go.
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Unread 08-17-2008, 11:49 AM
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Re: 300 RUM or 300 Jarrett

Thanks for everyones comments and advise. I decided to go with the 300RUM based on everyones comments,and gave the custom build order to "Nate 308" from this website. I agree that the 300RUM will do a better job with the 200AB and 210 Bergers. He has a deposit in hand. It's going to be built on a Manners GAT stock, factory accurized Rem. action, with Krieger 26'', 5.5 contour barrel, fluted, DE muzzle brake. I am also going to have him do a paint job on it.
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Unread 08-17-2008, 11:55 AM
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Re: 300 RUM or 300 Jarrett

Trueblue, please post pics when you are done. I am VERY interested in intel on the Manners stock.

My next build is narrowed down to either a Manners, McMillan, or MPI.
Derek M.
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