Is the 300 Jarrett an obsolete caliber now that the 300RUM is on the scene ? I am trying to decide which caliber to build a custom rifle for, to be used for longrange on elk and moose. Going to shoot heavier bullets in 200-210 gr.

Which is easier to load for? Consider that you can get factory loads for the RUM if need be.
.

quote:

Originally posted by Trueblue:
Is the 300 Jarrett an obsolete caliber now that the 300RUM is on the scene ? I am trying to decide which caliber to build a custom rifle for, to be used for longrange on elk and moose. Going to shoot heavier bullets in 200-210 gr.

What is your understanding of the benefits and obstacles of each caliber? What do you know about each? What are your likes and dislikes about each?

Since you have narrowed it down to these 2, I'm guessing you have researched enough about both.

The 300 Jarrett is rare and always has been, but I wouldn't say it is obsolete. You will always be able to obtain brass by resizing 8mm Remington brass. Heck, if you want to shoot 200-210 grain bullets at high velocity, you could just choose the 8mm Rem. That is exactly what the 8mm Rem was designed for.

The 300 Jarret is based off of the 300 and 375 H&H cases. The same as the 300 Weatherby, 7mm STW, 8mm Rem, etc.

I see no advantage over a 300 Weatherby, yet I see disadvantages such as having to fire form the cases.

No way would I consider a 300 Jarret over a 300 RUM the RUM holds more powder thus more performance.

I have a 30 cal Krieger #5.5 contour 26" 1:10 twist coming this fall. Trying to decide what rifle to build on a Rem 700 LA BDL action that I have on hand. Thought about the 300 Jarrett and the 300RUM because I have some brass on hand for both, but would be interested in hearing other caliber suggestions for this build.

Trublue I believe the 300 Jarret was based on the 8mm Rem case necked down to 30 cal so no fireforming was required. It is very similar to the old 300 H&H impoved cartridges. The 300 Rum is a larger case and you will burn from 10 to 15 grs more powder than you will with a 300 Jarret or300 Wby. How much more velocity does that give you ? Not much. You might want to check several of the new loading manuals and you will find the 300 Wby or 300 Jarret case cartridge will push a 180 gr bullet around 3200 fps. with all that extra powder the 300 Rum will push the same bullet to 3250 or 3275 according to most loading manuals. I have a 300 Rum and three 300 Wby rifles. Max velocity in my 300 Rum is in the 50 to 75 fps more than the Wbys and there is additional recoil and noise. My 300 Rum is also a pound and a half heavier than the Wbys. If you want to shoot bullets in the 200 -225 gr range I would suggest you build your custom rifle with a 26 in barrel and chamber it for the 8mm Rem mag or the 340 Wby mag. If you feel you must have a Rum go to the 338 Rum.

I had a 300/8 Mag which is indeed a virtual twin to the 300 Jarrett (maybe some shoulder angle differences or something but same case for all intents and purposes). I rechambered the rifle to 300 Wby out of boredom one month. Same gun and barrel, different chamber. No difference in performance. In fact, I always used Wby data for my 300/8 Mag loads.

I wouldn't try the 300 Jarret unless I bought a Jarret rifle and wanted the panache of his proprietary caliber. The Wby does it all, anyway. The 300 RUM is a different matter though. Especially if you plan on bullets 200 gr or over. My barrel is 1-8 twist and loves anything over 200 grains.

quote:

Originally posted by snowman:
Trublue I believe the 300 Jarret was based on the 8mm Rem case necked down to 30 cal so no fireforming was required. It is very similar to the old 300 H&H impoved cartridges. The 300 Rum is a larger case and you will burn from 10 to 15 grs more powder than you will with a 300 Jarret or300 Wby. How much more velocity does that give you ? Not much. You might want to check several of the new loading manuals and you will find the 300 Wby or 300 Jarret case cartridge will push a 180 gr bullet around 3200 fps. with all that extra powder the 300 Rum will push the same bullet to 3250 or 3275 according to most loading manuals. I have a 300 Rum and three 300 Wby rifles. Max velocity in my 300 Rum is in the 50 to 75 fps more than the Wbys and there is additional recoil and noise. My 300 Rum is also a pound and a half heavier than the Wbys. If you want to shoot bullets in the 200 -225 gr range I would suggest you build your custom rifle with a 26 in barrel and chamber it for the 8mm Rem mag or the 340 Wby mag. If you feel you must have a Rum go to the 338 Rum.

The 300 RUMS will easily do 3300+ FPS with 180s and Retumbo and 3200 with the 200 grainers and Retumbo

If I was building a hi performance .300 today.....it'd be a .300 Ruger.....on the .375 case

You could call it a short action .300 Weatherby.

Hi TB:

I am not that familiar with the 300 Jarret, but I am very familiar with the 300 RUM. It seems to me that it is an inherently accurate cartridge.

Remember now Remington has three different factory loadings for it, Full Power, medium and light.

I am an avid handloader, when I bought my 300 RUM about 10 years ago I bought a box of factory Remington fodder 180 grain Swift Aframes. It shot less than one inch right out of the box. The more I shot it the better the groups got. I never did hand load for it.

I have also taken over 20 head of game with my 300 RUM. From coyotes, Bull Elk, Kudus, Bull Giraffe, Hartebeast and much more. It is a fantistic killer and deadly accurate round. This past March in New Zealand I nailed a Red Stag at 369 yards, mountain top to mountain top, one shot, boom flop.

Last year I found a 338 RUM twin sister to my 300 LLS Model 700. I bought it on the web, it also shoots sub MOA with 250 grain Swift Aframes in Remington factory fodder.

When it's an expensive hunt, and I have to make the shot, and I need the confidence of my best rifle... It's the 300 RUM for me.

Regards.. Jim P.

quote:

Is the 300 Jarrett an obsolete caliber

If it is, I doubt the present oweners of that cartridge will care. It was and remains a wildcat with all the advantages and disadvantages of wildcats.

The idea of an "inherently accurate" hunting cartridge escapes me. Even the much vaunted 6 mm PPC only has a tiny average advantage, maybe .1", over several other popular cartridges. And that's with precision BR rifles with barrels that cost as much as factory rifles, complete.

IMHO, the idea of some "inherent accuracy" advantage in a hunting cartridge has no valid meaning for factory rifles used in the woods and fields.