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#598850 - 02/04/08 06:10 PM reloads for a 7mm rum
redhunterZ71
6 Point


Registered: 01/01/08
Posts: 579
Loc: Cleveland, TN

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anyone have a good load for a 140 gr ballistic tip in a 7mm rem ultra mag. im shooting a load now with R22 90.5 gr with a 140 gr nosler ballistic tip
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#599186 - 02/04/08 08:32 PM Re: reloads for a 7mm rum [Re: redhunterZ71]
mr.big
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Registered: 01/03/01
Posts: 28834
Loc: Copper Head Road

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WHY,,I wouldn`t shoot anything lighter than the 162 Hornady and would really look hard at the 180 Berger.
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#599667 - 02/05/08 06:24 AM Re: reloads for a 7mm rum [Re: mr.big]
TiminTN
12 Point


Registered: 06/18/00
Posts: 6337
Loc: Memphis,Tennessee U.S.A.

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I`d try some 7828.
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#599850 - 02/05/08 09:08 AM Re: reloads for a 7mm rum [Re: TiminTN]
megalomaniac
12 Point


Registered: 10/28/05
Posts: 5096
Loc: Mississippi

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Gotta agree with Mr. Big.... the ultramags really shine with heavy-for-caliber bullets.

With your above load, you should be pushing the 140BT's around 3450-3500 fps. Heck, my little 7 WSM does 3300 fps with the same bullet (although I use accubonds in it) and a LOT less Re22. Use a heavier bullet, and fill the case up with a really slow burning powder like Re25, US 869, retumbo, IMR 7828 or the like.

The ultramags are so horribly inefficient, the only justification for their existance is to fling bullets with insane BC's at magnum velocities. Don't get me wrong, I LOVE the ultramags and the niche they fill

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#599957 - 02/05/08 10:06 AM Re: reloads for a 7mm rum [Re: megalomaniac]
Hillbilly Hunter
Killbilly
16 Point


Registered: 07/15/05
Posts: 17974
Loc: Branchville

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 Originally Posted By: megalomaniac

The ultramags are so horribly inefficient, the only justification for their existance is to fling bullets with insane BC's at magnum velocities. Don't get me wrong, I LOVE the ultramags and the niche they fill




I agree.
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#600928 - 02/05/08 07:25 PM Re: reloads for a 7mm rum [Re: ]
TiminTN
12 Point


Registered: 06/18/00
Posts: 6337
Loc: Memphis,Tennessee U.S.A.

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I`m only running trajectory charts to 500, but a 140 is king to that distance.

I guess I should be more open minded.
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#602079 - 02/06/08 08:08 AM Re: reloads for a 7mm rum [Re: ]
megalomaniac
12 Point


Registered: 10/28/05
Posts: 5096
Loc: Mississippi

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Tim,

The 140's are awesome under 500 due to thier higher speed overcompensating for the poorer BC. (Except for wind drift... IIRC off the top of my head, the heavy BC bullets are better in wind after only 400 or so).

That being said, with many ultramags, you often get more 'bang for the buck' with the heavier bullets, because of the inherent cartridge inefficiency.

IE, it takes a ton of powder to push the 140's at top speeds, while a bullet 25% heavier will travel only 10% slower with a little less slower powder. And that doesn't even take into account the extreme throat erosion you get with the ultrafast light bullets.

In my mind, there's just no reason to shoot an ultramag unless you actually plan on shooting past 400-500.

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#602095 - 02/06/08 08:28 AM Re: reloads for a 7mm rum [Re: megalomaniac]
TiminTN
12 Point


Registered: 06/18/00
Posts: 6337
Loc: Memphis,Tennessee U.S.A.

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I built mine for 1 purpose only. Antelope. It does that job well.
It is also the reason I chose a 7mm bore as the BC`s are matched higher for lighter bullets than the 30 bore.
I shoot 600 yd matches, and have a good idea of BC`s and their role in wind and drop. I think I ran the numbers to 600, and was just trying to be agreeable, but the 140 7mm is king to 600 yds, if not mistaken.
I`m talking drop, not wind. The 200 fps advantage keeps the 140 in the boiler room "better" out to 600 yds. Now I have to ask myself another question.
Just how far is my personal limit, and am I willing to use a living breathing critter to find out? Now if I were to compete with my rifle against some of the TV or DVD celebrities who shoot at extreme range, or just want to get on this site and others to brag.
I guess I could with the equipment I have it would certainly be justifiable. That just ain`t me.
If I am set up, right now out to 500 with no holdover, just a top of the back hold I`m good. You go out to New Mexico with that and look around with rangefinder and you will see that is a lot of ground you can cover.
I get excited being able to stalk, and use the territory, belive me, I have enough gun. No other bullet change for me.

I did buy some 162`s to play with, and have access to a 600 yd range, so maybe I should do some experimenting to confirm some of my beliefs.
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#602281 - 02/06/08 10:22 AM Re: reloads for a 7mm rum [Re: TiminTN]
megalomaniac
12 Point


Registered: 10/28/05
Posts: 5096
Loc: Mississippi

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I agree with you Tim on most points except for the importance of wind drift in longer range applications. For me, it's a no brainer to range, come up clicks, then pull the trigger. But judging wind speed is much more difficult than judging distance.

I might miss the distance by a yard or two with my rangefinder, but it's entirely possible I could very well be off 5mph in guessing wind speed or even in wind angle. Heck, even if you have a Kestrel, there's no guarantee that the wind is consistent from the point you shoot to the target.

I may actually be making your point for you since I won't shoot at game long range if there is more than a 5-7mph wind because of the increased variablilty, but still that being said, its so much easier for me to compensate for bullet drop rather than wind drift.

At the distances most people are willing to shoot, I will still contend that the ultramags offer no advantage over traditional magnums, though. For example, using a 7mm Rem Mag versus the 7mm ultramag and 140gr BT's, the standard magnum only drops 2.5" more at 400 and 5" more at 500 than the ultramag. And uses 25 grains less powder. And has a much longer barrel life. Why spend all the extra money in powder, brass, and barrels if you aren't going to take advantage of the cartridge (long range applications)? And if you are going to shoot long range, the heavier, higher BC bullet will shine in KE and wind drift.

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#603240 - 02/06/08 07:18 PM Re: reloads for a 7mm rum [Re: megalomaniac]
mr.big
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Registered: 01/03/01
Posts: 28834
Loc: Copper Head Road

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Tim I know you know your stuff,,I just couldn`t get the 7RUM to shoot accurate with the lighter bullets and muzzle blast was horrific,,I could get the 154 Hornady within 50 FPS of the 140 and the 162 was no more than 100 slower,,

with 140 7mm bullets the Weatherby or STW is about all the powder you need..
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