How about a 300 Win Mag “Modified”?

[J E Custom]

I love the 300WM and have been shooting it for years. Gotta admit two things I don't like are the belt and the short neck. Any such thing or any way to eliminate the belt and lengthen the neck? I don't want to move up to the R.U.M. Because the WM burns enough powder as it is and supplies all the power and distance I want.

All that is realy necessary is to change your loading process to enhance the things that you have an objection to.

First let's address the belt. If you have a problem with the belt, simply don't full length size. The 300 win mag can have up to .009 thousandths clearance between the belt face and the Datum line if you full length size. (The reason for the belt is to maintain head space with a much sized case for assured chambering in dirty chambers of for dangerous game) the first belted was the used in 1925 buy Holland and Holland.

After you fire the case in your chamber size only enough for it to chamber or neck size only, this eliminates the need for the belt and uses the datum line for head space turning it into a shouldered case.

Next is the short neck length. A long time ago it was thought that a minimum neck length "Had" to be one caliber long. There were many reasons that this was the rule of thumb when dies, chambers, bullets and cartridge cases were not very good. all that has changed now and this is no longer the rule.

It is not the length that is needed for accuracy (The 300 win mag is known for it's accuracy) it is the amount of grip the neck has on the bullet and the accuracy of loading concentric ammo. one can cock the bullet in any neck if the loading procedure is not good, so neck length has nothing to do with accuracy. In fact some shooters prefer even shorter necks.

I guess what I am trying to say is, be happy with your 300 WM and load this way to reach your goals and likes.

PS: I have 5 rifles that will shoot under 1/10th MOA (Less that 100 thousandths 5 shot groups) and 2 of them are belted. Belted cases are also the easiest to wild cat if you want to move the shoulder forward and require no special loading to fire form. No seating against the lands, no forming a Donut or filling the case with corn meal. just shoot parent cased ammo and you are done.

Be happy with the 300 WM, It is a very good cartridge in my opinion.

J E CUSTOM

 

[sodakota]

A 30 Newton is what you're looking for.

 

[HobieH3]

KYAROY said: "The developers of the more modern magnums such as the 300 WM and 7mm Rem knwe that belts were unnecessary, but put a belt on anyway for marketing reasons thinking that buyers expected a belt on magnums because of the 300 H&H from 1925."
...but let's jump all over Hornady for their marketing hype.
How's that .260 Rem run in an AR, by the way?

 

[Nowoolies]

G'day Moosehunter , Why not forget about the belt it's not really that big a issue, I think anyways
I have just built my second .300 wm as per my avatar
This is built on the Hornady ELD-X 212grn , seated the projectile out too 2.910 using a Hornady comparator 8.30 its around 1 caliber seated into the neck , it's all one needs to hold the projectiles imo
Giving me a larger boiler room,
I have a 33 inch Rock Creek heavy Palma Match Barrel as well for a little more speed
A Bighorn TL3 action ,I've forgotten what brand the mags are but they allow me to seat the projectiles out a fair way out
My main goal was more kinetic energy down range ,

I was thinking of a way to extend/modify the .300 case for just on 3 years , then the ELD-X type projectiles came out,
This solved my thoughts , by seating the projectiles out further giving more boiler room, = more powder=more velocity = more kinetic energy down range
I still haven't run it over my chronograph yet , hopefully in the next couple of weeks ,will post velocity
Soon
So far this rifle is printing 1.8 inch at 500 yards , can't get the picture of the target up on here yet ?
Still got heaps more to go developing I think.
I've just ordered a few hundred of the new Hornady 230 grn A-Tip to try out ,I'm hoping these will be good in my Rifle out too 1500-2000 meters , just targets at those sort of ranges .
The powder I'm running is AR2225 , I'm up to 81.3 grns so far with absolutely no pressure signs ,using federal 215m primers with S&B cases and still have a little bit more boiler room to use

AR2225 which is equivalent too Retumbo and Reloader 25 ,I have never used the last two powders.
This is my load data if you want to try it out please start at least 5% lower

 

[Nowoolies]

The developers of the more modern magnums such as the 300 WM and 7mm Rem knwe that belts were unnecessary, but put a belt on anyway for marketing reasons thinking that buyers expected a belt on magnums because of the 300 H&H from 1925.
I have never owned a 300 WM, but shot and reloaded a 7mm Rem. in a 700 Rem. for years. The belt caused the cartridges to cant in the magazine to the point that the gun would NEVER feed without giggling the cartridges between shots. Fortunately the gun shot well enough that a followup was rarely necessary.
I switched to 300 WSM and between no belt and less tapered cases my Browning always feeds the cartridges. The 300 WSM may not be for you, but I would avoid belts. There are too many good choices that don't have belts.

G'day Kyaroy
How / where did you get that information from , the belt is not a marketing ploy ,

This design came from Holland and Holland for the purpose of head spacing the more powerful cartridges
Some non shouldered non bottle necked Magnums could be pushed too far into the chamber and could / would cause catastrophic failure with excessive head space .
This information is on Wikipedia where I got this from lot more there than what I've typed
Was / is easier to read than what I started dribbling, lol
I've never had cartridges ( giggling) in the mag , maybe don't tell jokes when your shooting lol
And I've had a few belted mags over the years

 

[HobieH3]

G'day Kyaroy
How / where did you get that information from , the belt is not a marketing ploy ,

This design came from Holland and Holland for the purpose of head spacing the more powerful cartridges
Some non shouldered non bottle necked Magnums could be pushed too far into the chamber and could / would cause catastrophic failure with excessive head space .
This information is on Wikipedia where I got this from lot more there than what I've typed
Was / is easier to read than what I started dribbling, lol
I've never had cartridges ( giggling) in the mag , maybe don't tell jokes when your shooting lol
And I've had a few belted mags over the years

I think the point is that the belt was NOT needed for the 300 and 7mm WM necked cases, but was left on anyway because the belt said "we've got so much power in here the case needs reinforcement".

Anyway, that's why I thought they were there before I learned better.

 

[HobieH3]

When I was looking for a 300 last year, I looked at all of them. The 30 Nosler looked to be the most efficient Cartridge out there, to me. 300 WM and 300 Wby have proven track records around the Globe. The 30 Nosler tops the WM and equals the WBY. The 300 RUM & 30-378 WBYs are marginally faster than the 30 Nosler, but have to burn 20% more powder for 5% velocity gain, have Magnum Length Actions and have passed the point of diminishing returns, again, to me. Hornady tweaked Nosler's Cartridge a bit and hung the PRC brand on it (who doesn't love a Precision Rifle Cartridge?). There's not a bit of difference really between the 30 Nosler and 300 PRC, or the 300 Wby for that matter but it's a belted round and the OP doesn't want the belt (don't blame you). Right now, given your parameters, the choice is the 30 Nosler or the 300 PRC. 30 Nosler has ADG Brass but I expect the 300 PRC will be available in that brand too if it becomes more popular. Until then you will be relegated to Hornady Brass, but I don't think that's as bad a thing as some here make it out to be. You'll be happy with either one.

Just when it looked like a good old fashioned flame war was working up, rationality and reason raise its ugly head.

Do you even internet?

 

[scottpt]

Check out the Sherman 300 PRC S.I. ... might be exactly what you are after. And it's new and kinda sexy!
https://shermanwildcatcartridges.com/300-prc-s-i

 

[robert l]

No, you get jumped because you keep saying they are pointless cartridge.

Yet, once again we have someone literally asking for EXACTLY what it was built for. It just isn't something you want, so it's Hornady bandwagon crap.

Why are you talking about hornady when they were making brass before your *** was even thought about.and where i live we use that fish for bait...

 

[ncwg2boatguy]

300PRC

 

[comen]

The developers of the more modern magnums such as the 300 WM and 7mm Rem knwe that belts were unnecessary, but put a belt on anyway for marketing reasons thinking that buyers expected a belt on magnums because of the 300 H&H from 1925.
I have never owned a 300 WM, but shot and reloaded a 7mm Rem. in a 700 Rem. for years. The belt caused the cartridges to cant in the magazine to the point that the gun would NEVER feed without giggling the cartridges between shots. Fortunately the gun shot well enough that a followup was rarely necessary.
I switched to 300 WSM and between no belt and less tapered cases my Browning always feeds the cartridges. The 300 WSM may not be for you, but I would avoid belts. There are too many good choices that don't have belts.

You could go to a 30 Newton, or for more zip a 30 Boo-Boo.
"The idea of a fast .30 is hardly new. First was probably the .30 Newton, introduced by Charles Newton in 1913. The .30 Newton is a fat-cased unbelted cartridge designed to fit into a .30-06-length action. Performance is about the same as the .300 Win. Mag., but in a case design far ahead of its time. Had it become popular some of our modern fast .30s might not exist..." Craig Boddington

 

[Deleted member 103481]

Why are you talking about hornady when they were making brass before your --- was even thought about.and where i live we use that fish for bait...

I have literally no idea what you are talking about.

 

[HobieH3]

Check out the Sherman 300 PRC S.I. ... might be exactly what you are after. And it's new and kinda sexy!
https://shermanwildcatcartridges.com/300-prc-s-i

Do you think Rich has a tattoo of P.O. Ackley?

 

[Pappabear]

Many peeps complain about the "belted" magnums but my buddy who does our reloading has never had an issue. Pushing 225 ELD's @ 2887fps and sub Moa will solve most issues.