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Improved Cartridge Question

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Old 05-03-2008, 07:12 PM
Bronze Member
Join Date: Mar 2008
Location: Alabama
Posts: 66
Originally Posted by J300UM View Post
Improving the 300 rum was something my gunsmith talked me into. I was fairly ignorant at the time and it sounded pretty cool to me. If I knew then what I know now, I would have definately had the gun chambered to 338 edge. Im waiting on a smokin deal for another 300 or 338 rum to use to build an edge. Btw, thanks for the critisism... I mean advise.
It wasn't a criticism, it was a valid question, as I think you now know. I'd go have a talk with that smith of yours! I'd talk refund, or maybe some free work! Sounds like he just made up a reason to take your money!
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Old 05-03-2008, 09:28 PM
Silver Member
Join Date: Feb 2008
Posts: 121
The case is big to start with

A longer magazine would be a sensible the way to go, if one is going to all that trouble to enlarge the case capacity.

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Old 05-04-2008, 05:16 PM
Posts: n/a
Originally Posted by J300UM View Post
I have a question about my new rifle (300 rum improved). I'm assuming my gain in case capacity is going to be toward the top of the case near the shoulder. With that being said, am I waisting my time with the new cartridge by using longer bullets that protrude into the case quite a ways? Or will I still be able to take advantage of the extra horsepower to push heavier bullets? I want to load my rounds to fit in the mag if that has any influence on your answers. Thanks!!!
You can probably find you some dual diameter bullets that will allow the bullet to be seated farther out prior to touching the lands. That way you can take full advantage of the new powder capacity of the case.

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Old 05-04-2008, 07:29 PM
Platinum Member
Join Date: Mar 2007
Location: MN
Posts: 1,219
Originally Posted by .280Rem View Post
It wasn't a criticism, it was a valid question, as I think you now know. I'd go have a talk with that smith of yours! I'd talk refund, or maybe some free work! Sounds like he just made up a reason to take your money!
Easy fella ;)

Like Jones said, there are other advantages to the improved version. He isn't the first one to do it and won't be the last. Case capacity is case capacity. I agree with the others that getting a longer mag put in to allow you more room for longer bullets is the way to go.

Good luck with your rifle and happy shooting.
I used to re-load but now I "hand-load".
-- Well, at least I try --
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Old 05-04-2008, 07:41 PM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 6,025

I wouldnt be two hard on your smith because he probably thought
he was helping you out.(Not defending him )but he should have
explained how much bang you were getting for your buck.

You did'nt hurt your self and second thoughts are your worst enemy
when building a custom rifle. Most all smiths have an opinion as to what
is best for its intended use and I am no different "BUT" I do tell the client
the advantages and disadvantages of each choice and then let him/her
make the decision.

As to the term "IMPROVED" I have owned several P O Ackleys that were
built by himself and they were originally based on cases with fast tapered
bodies and 25 to 35o sholders. These rounds were truly Improved by
blowing the body out to a minium taper that minimizes bolt load and
improves brass life. Also by changing the sholder taper to 40o or more
it added volume but most important was that it improves/changes the
burn rate and pressure wave inside the case making it more accurate
most of the time.

On the more modern case designs they are now doing this for the same
reason. Efficiency, capacity,bolt loadwith higher pressures, and accuracy.

So as some of the others have said you may not gain much velocity but
it should be better if only by a small margin.

So the term Improved should in some cases be called Inlarged,Changed,
Wildcat'ed, Modified But not "Improved".

So my recommendation is to shoot and enjoy your new toy and I can
tell you that you will be empressed if the smith did his part.


Last edited by J E Custom; 05-10-2008 at 08:15 PM.
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Old 05-04-2008, 09:00 PM
Platinum Member
Join Date: Feb 2005
Location: USA
Posts: 2,598
J E Custom is spot on in his post... I thought that the original post that started this thread was asking advice before the build, and that is how I based my intial response.
range it,check the wind, dial in correction, aim and only one shot
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Old 05-04-2008, 09:47 PM
Silver Member
Join Date: Dec 2007
Posts: 119
Thanks for the replies! Sorry that I was kind of a smart *****. It seems like every time I post a question here, people seem more intent on bashin what I have or the questions I have then actually answering them. There is a ton of knowledge here and I would like to aquire some of that. I certainly dont expect answers but I do appreciate the ones I get. Maybe I took some of the replies the wrong way. Again, thanks!
Sharks are like dogs... They only bite when you touch their private parts!
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