.458 AccRel reloading data request

[MRogersII]

I am looking for first-hand load data for the 458 Accrel, particularly using the 500gr Hornady.

Thank you in advance for your help.

Michael

 

[CoElkHunter]

I am looking for first-hand load data for the 458 Accrel, particularly using the 500gr Hornady.

Thank you in advance for your help.

Michael

Just curious about this cartridge? Can you describe the .458 Accrel? Thanks!

 

[MRogersII]

It is the RUM, shortened to 2.55, blown out to .458. Let me get a pic for you.

From my cartridge board. Right to left: 460 G&A #2, 458 AccRel, 45-120, 458 Lott, 458 Win Mag...

 

[CoElkHunter]

It is the RUM, shortened to 2.55, blown out to .458. Let me get a pic for you.

From my cartridge board. Right to left: 460 G&A #2, 458 AccRel, 45-120, 458 Lott, 458 Win Mag...

Very cool! It almost looks like the .416 Taylor necked up to .458, but with the fatter RUM case and no belt? Very interesting!
Whether or not these “wildcats” have a practical advantage over “what’s out there” is irrelevant to me. It’s thinking outside the “cartridge box” so to speak, which is how many of our current mainstream cartridges came to be in the first place and is fascinating to me!

 

[MRogersII]

It is an interesting cartridge. I just received it this past weekend. I'm hoping to fireform some cases this weekend. Pretty excited actually.
Michael

 

[CoElkHunter]

It is an interesting cartridge. I just received it this past weekend. I'm hoping to fireform some cases this weekend. Pretty excited actually.
Michael

Where did you procure dies for it and what parent cartridge cases do you use? .300 RUM?
For my .416 Taylor, I just run .458WM cases through the Taylor die and with one pull of the press, have the .416 Taylor cases.

 

[MRogersII]

Not sure if anyone has done it or not but I was playing with some forming dies on Sunday and necking up the 375 RUM to 458 and then leaving it full length.....that would be a thumper! Would require significant mag modifications but, the finished product would be a real boomstick. I had a 460 G&A #2 when I was younger (regret #58). It would be similar to that.

 

[MRogersII]

I bought the 458 dies with the rifle.

 

[CoElkHunter]

Not sure if anyone has done it or not but I was playing with some forming dies on Sunday and necking up the 375 RUM to 458 and then leaving it full length.....that would be a thumper! Would require significant mag modifications but, the finished product would be a real boomstick. I had a 460 G&A #2 when I was younger (regret #58). It would be similar to that.

Actually, that would be cool! I thought of running a .458 Lott case through my .416 Taylor die and producing a .416 Lott or .416 Taylor Express or whatever. But, I was chastised here when I promoted it cause of the existence of the .416 Remington Magnum. I’m still going to do it though when I get some Lott brass. Is it relevant or cost effective? No, but I don’t care and Redding told me they could manufacture dies for it. Actually, for now, the Taylor dies would resize the case to just above the belt?

 

[MRogersII]

In my experience (whatever that amounts to) cost-effective and relevant go out the window just as you pass by 30-06 and head north towards 300 Win Mag. I grew up shooting groundhogs at (what i considered at that time to be) long range with a Ruger #1 in 375 H&H and a Harris bipod. By no means cost-effective. Maybe not even that smart. But I wouldn't trade that experience for anything. The 300 Sierra MK and a Tasco benchrest scope. Those were the good ol days. I still have a light scar over my right eye to prove it.

 

[CoElkHunter]

Not sure if anyone has done it or not but I was playing with some forming dies on Sunday and necking up the 375 RUM to 458 and then leaving it full length.....that would be a thumper! Would require significant mag modifications but, the finished product would be a real boomstick. I had a 460 G&A #2 when I was younger (regret #58). It would be similar to that.

I’m not sure about having to do “significant “ mag modifications? My Interarms Whitworth (kind of custom) .416 Taylor will hold four .458WM in the magazine AND feed them up to the chamber with no issues? I tried this cause I hadn’t reloaded the Taylors yet.

 

[MRogersII]

I don't think the mag on this 798 Rem would handle a full-length RUM. And the reamer would need to be throated to accommodate the 500gr. I would need to verify the mag limitation though. May do that this weekend.

 

[CoElkHunter]

In my experience (whatever that amounts to) cost-effective and relevant go out the window just as you pass by 30-06 and head north towards 300 Win Mag. I grew up shooting groundhogs at (what i considered at that time to be) long range with a Ruger #1 in 375 H&H and a Harris bipod. By no means cost-effective. Maybe not even that smart. But I wouldn't trade that experience for anything. The 300 Sierra MK and a Tasco benchrest scope. Those were the good ol days. I still have a light scar over my right eye to prove it.

Yeah, I guess no guts (innovation), no glory (or pain!). Ha! Ha! Ha!

 

[MRogersII]

I may go ahead and seat a 500 in the full-length UM and take a pic. No reason not to. I can imagine that the reamer would also need to increase the width at the new shoulder. As it is, the shoulder is pretty small. At full length, and with the existing body taper, it wouldn't be much more than a wrinkle.

 

[MRogersII]

I'm actually surprised that Rem stopped with the 375 in the RUM case. Seems almost intuitive to me that you would go the next step. Of course, maybe they did and I just don't know about it.

 

[CoElkHunter]

I don't think the mag on this 798 Rem would handle a full-length RUM. And the reamer would need to be throated to accommodate the 500gr. I would need to verify the mag limitation though. May do that this weekend.

Yeah, I don’t know? The 798 is a Zastava (Interarms) action. There was a previous thread somewhere here on AH about converting an Interarms Mark X from .458WM to a Lott, but I don’t remember the consensus other than having to cut or modify something forward (maybe the feed ramp) to make it work?

 

[MRogersII]

I need to stop talking about this, I haven't even fired it yet and I'm thinking about a reamer print.

I am going to seat a bullet in the full length case though and post a pic. Just for the purposes of healthy discussion of course.

 

[CoElkHunter]

I may go ahead and seat a 500 in the full-length UM and take a pic. No reason not to. I can imagine that the reamer would also need to increase the width at the new shoulder. As it is, the shoulder is pretty small. At full length, and with the existing body taper, it wouldn't be much more than a wrinkle.

If the case width is the same and coal is the same the magazine should feed it ok. But, the reamer would have to take a little bit off I’m guessing? But not too much?

 

[MRogersII]

It's bedtime here in central KY. Goodnight all.



...and no, I don't think the reamer would need to be shortened significantly. RECOIL might become a matter of consideration. Just a thought.

 

[CoElkHunter]

I need to stop talking about this, I haven't even fired it yet and I'm thinking about a reamer print.

I am going to seat a bullet in the full length case though and post a pic. Just for the purposes of healthy discussion of course.

Well, shoot what you have for now and keep dreaming about the next BIG thing! That’s what I do!
Cheers and goodnight!