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From a reloading perspective, I think the 458 Socom is logistically a more sound choice. Once you are set up with a nice stockpile of brass, there are much greater bullet varieties/availability for the 458. The .458” diameter bullets are the king of the 45 caliber projectiles.
 

osprey

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I was heavily invested in 45-70 components already, so it was an easy choice for me to go with the 458 socom. Most all the 45-70 projectiles and some of the same powders work in the 458 socom. The only hitch I had reloading was with my go to dies, (Redding) were not good. The sizing die was a hot mess and I stuck several cases. I gave up and bought a set of Hornady dies and have loaded hundreds of rounds without issue. Some of my favorite loads are subsonic and some are tickling the heels of the 45-70.
 

kmk1012

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Big bore AR’s are fun for sure. I love my 50 Beowulf! I’m not sure I’d like a single shot AR though. A Ruger American Ranch in 450BM would be the ticket. I know, not what the OP is going for but would be better suited I’d think.
Now, the 45 Raptor, that sounds like my next project for my Aero AR10!!!!
 

Capn Jack

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No one has mentioned it so far, but I have found PLAIN BASED cast bullets erratic in my .458S.
They, "Pattern" more than, "Group".
For an all round bullet, I have settled on the .325 gr. FNGC by RCBS from MidWay U.S.A. It's a double cavity mold that works well with my bottom drop LEE lead pot.
 

arakboss

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Capn Jack

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I was so disappointed with plain based performance that I gave away the molds I had and went strictly with gas checked. I eventually bought a gas check punch and that's where I am today. My latest endeavor is powder coating, but I haven't had a chance to fire any of them yet. :(
 

arakboss

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I was so disappointed with plain based performance that I gave away the molds I had and went strictly with gas checked. I eventually bought a gas check punch and that's where I am today. My latest endeavor is powder coating, but I haven't had a chance to fire any of them yet. :(
Big bore AR’s are fun for sure. I love my 50 Beowulf! I’m not sure I’d like a single shot AR though. A Ruger American Ranch in 450BM would be the ticket. I know, not what the OP is going for but would be better suited I’d think.
Now, the 45 Raptor, that sounds like my next project for my Aero AR10!!!!
I know there are a few budget 450 bushmaster bolt rifles out there. And there are even a few 458 SOCOM bolt rifles out there (not budget though):

 

arakboss

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I am thinking about delaying a 458 purchase and getting the 350 Legend Side charging upper to accompany the 450 BM side charging upper I already ordered. The cost of loading the 458 SOCOM is going to be prohibitive at the moment and I think we'll see continued deals at BCA for these uppers.

The 450 BM I ordered is a Gen 2. Here is a video detailing the differences between the BCA Gen 1 and Gen 2 side charging systems.

 
I would go with the 450 Bushmaster, just because of it's current popularity. It appears as though it will be sticking around for a while.
 
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