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edge vs ultramag is there any difference

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Old 09-11-2010, 03:42 PM
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edge vs ultramag is there any difference

newbee Questions Ha ok here goes ive got a 338 ultra has anyone compared the two rifles equally i geuss what im trying to say is has anyone put the 4 grand in a custom 338 ultra then compared it to the 338 edge, the reason im asking is for one the ultra will shoot store bought ammo got into that last year at a hunt were only box ammo was allowed lead tip only. then on top of that i was reading were the edge lost accuracy when case was filled with heavy load of powder, now i have 338 ultra loads with 82 to 91 grains behind 300 match kings, im thinking about throating mine and doing some other things. the reason behind these questions is i have the rifles to build the edge but if there are not great differences i just soon not tear my 300 ultra up cause it was a shooter out of the box just unbelievable. i already had to down size my scope on the 338 cause it rattled every large heavy scope loose the only scope i have that will stay put is 3200 bushnell. this gun has brake and custom thumbhole weighted stock those dam 300 MK with a compressed load whips those scopes around good. got leapold bases and rings on all my ultras the 300 ultramag seems to have a great deal more recoil but i never had a problem with it . so if i set my 338 up like the edge meaning same barrel,trigger and bolt wont it shoot equall to the edge. i read were the edge shoots best with like 92to 94 grains powder anyway. GO EASY PLEASE
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Old 09-11-2010, 04:41 PM
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Location: Cranbrook, BC, Canada
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Re: edge vs ultramag is there any difference

There is a little over 100fps difference. To actually have a fair test of the two you would need to shoot the rifle as a 338rum record the velocity, then re-chamber to edge and shoot again for velocity. I am not sure if anyone has done that. As well getting edge velocities from a 338rum is possible, but your pressures would be nearly "proof" loads. You would be way above the standard saami pressure for the rum casing. You will see guys crying about case life, and they are likely pushing the limit with pressures. If you need the speed get a larger casing.

For your question about powder charges, it depends on the powder you use. For the same powder in both cases it would be a roughly 4-5grain increase. If you compare IMR7828 in the rum, and H-1000 in the edge there will be a large difference in the charge weight. Need to compare apples to apples.

As to your scope problem. It depends on which Leupold rings you are using. The Leupold dual dovetail rings may not hold the scope with a braked rifle. They do not have much area holding the scope and have only one screw to tighten them. A set of Mk4 rings should hold. I run MK4 rings on my edge and have no problems at all. If you search on this site, several guys are running more than one set of large tactical rings on 338 edge and larger rifles. A rifle with a brake will start to move backwards with recoil before the effect of the gas hitting the brake starts to pull the rifle forward again. A braked rifle is very hard on scopes due to this.

If you are thinking of having the throat re-cut in your 338 rum, you could have it re-chambered to an edge at the same time. You said that you have a 300rum as well, so with an edge you can stock up only one size of brass.
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Old 09-11-2010, 05:25 PM
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Re: edge vs ultramag is there any difference

cool LB you give me more some more new ideas as far as powder i like the retumbo and H1000 for these guns! just that last winter in january i drew a 2 day hunt it was bitter cold 0- temps and i did not get the performance that i had in the fall at 400 yards my bullets were 36 inches lower in the cold. but that could have been the dam store bought ammo i had to use last minute i had my 7mm rum set up with balistic tips,300 also,and the 338 was the only gun i had a couple boxes i had picked up when i bought the rifle.
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Old 09-11-2010, 06:09 PM
B23 B23 is offline
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Re: edge vs ultramag is there any difference

Everyone looks at things from a different angle that's for sure. But, IMHO, if you are going with an aftermarket barrel, why would you not want to take advantage of the FPS increase of the 338Edge.

For me, the only way I would have a custom barrel chambered in standard 338RUM over and Edge would be if I wanted to make sure I could still shoot some type of factory ammo. Otherwise, I see no reason to not take advantage of the FPS increase with the 338Edge.

This is just an assumption but I would guess the majority of people who spend the money to have a custom barrel installed, also, use custom ammo. Weather that be hand loaded by themselves or someone else. I'm not saying there aren't some out there that only shoot factory ammo thru their custom barreled guns but I can honestly say I don't know a single person that has a rifle with a custom barrel that doesn't reload.
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Old 09-11-2010, 10:14 PM
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Re: edge vs ultramag is there any difference

From zero to 1400yrds an elk won't be able to tell you the difference between a 338 RUM and a 338 EDGE!

There is a thread somewhere that I think two guys had these vary two chamberings and the RUM was equal or a little over the EDGE but I think it had a little longer barrel.
I don't think it would be a big deal to push the RUM chamber out to an EDGE with a chamber reamer.
My buddy is going with the RUM because it is plug and play reloading and it looks like it may be just a little easier to get to go though a mag since it is just a touch shorter, maybe.
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Old 09-12-2010, 01:58 AM
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Re: edge vs ultramag is there any difference

Just my 2cents it may of been covered already. I have read (on here) that the 338rum from rem is shorter than the 300 rum to try and stop people chambering the wrong round in the wrong gun so you do get a bit more case size over the 338 rum but as previously stated at distance 1000 yards + it's a few hundred fps and a little more hitting power.

Hoped it helped

what ya gonna shoot with that. ya know those deer that are just outta range for you. yeah. well there not 4 me!
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Old 09-12-2010, 04:49 AM
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Re: edge vs ultramag is there any difference

Another concern that has been previously posted is that the 338 rum is moving into the "discontinued" list; and the 338 RUM brass will cease existing. But there will always be a bunch of 300 rum brass.

I don't know how true these statements are. I have just read them more than once.

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