I have always wanted to build a .470 Capstick or 475 Ackley (not sure what the difference is other than someones stealing someone elses glory) I think I'm inclined to give credit to P.O. as he came up with the .475 Ackley many moons before the Capstick came about and their may be suttle differences in the two, to make it whatever!

But it's an extremely powerful cartridge with a .470 bullet at near 2500 FPS and with the wide cross section has to be an awesome killer of the big bad stuff in either name form..I have shot enough big stuff with the .470 at 2020 FPS and at 2145 FPS to know it kills extremely well on anything..

I think I will, after many years of good intentions, build one for myself. It is so simple to to buy basic magnum brass (375) and all you have to do is stick a .470 bullet in it and your good to go..

I have never seen much about the caliber on AR or on the internet, seems to me it is as close to the ultimate big bore as one could get..ease of loading, plenty of components to chose from and brass will always be available, no need to fireform or trim the first loadings and most of all it fits into a std. M-98 Mauser action perfectly and with a drop box it will take 5 down and one up the tube, easy to make feed..It just has to be a winner.

I will load mine at 2100 FPS or less with a GS Customs flat nost solid and North Fork cup points, as I did my 470 N.E. double rifle..that is all the velocity I ever needed and recoil recovery for follow up shots was fast..Not so with many big bores loaded hot, is this a factor or just imagined, I don't know but it seems to me I am faster on follow up shots, and its my choice...

I am with you on this Ray. I am back on track to go for the Capstick. Although I also have a 450 Ackley and find it to be too much of a good thing at times- Actually too light of a rifle, I have always wanted a .470. I nearly went with the .470 AR and considered the Mbogo I have finally settled on the Capstick for sure.
I am curious though that you are planning on using a standard action when even Ackley recommended use of a magnum action (375 length) only.
My plan is to use a CZ 550 magnum and have a barrel, H and H front sight with a single standing rear like the CZ on it. For a scope I will be using a Leupold 2.5 compact. I am adding a Mercury reducer and the decelerator pad. My CZ donor already has a crossbolt. I will probably full length bed it as well.

Do you have any photos of the drop box set up you are using?
Frank

I vote for the Capstick. Peter Capstick sparked the interest in Africa for me when I was a teenager and it has never gone away. The 470 Capstick carries a lot of WOW factor and to me would be the jewel in a gun collection. It basically is loaded like the 458 Lott so there is plenty of data already available. I prefer properly headstamped brass but you can get Hornady basic magnum brass for a buck apiece and that makes it cheap and obsolete proof. At the velocities you mention with 500 grain bullets I would think you would be 8-10k psi below max so it would be 1 load for anywhere, anytime and for anything on the planet. I think about the Capstick all the time and it would be my choice for a custom build.

Ray,
firstly, the 500 at 2500 isnt possible. That is, as much as I admire him, some of Ackley's "slightly" over pressure or overstated loads. its a .458 lott with a .474 bullet. or you MIGHT get 70 fps faster than a lott.

secondly, 400gr bullets are dirt cheap.. 400 that is. speer gold dot/deep curl.. and are tough

thirdly . .474.. good choice. look at the 470 AccRel for 2 seconds, then move on

jeffe

Ray, I say neither. Jeff is right. His 470 AccRel is the best bolt action 470 out there right now. I looked long and hard at a 470 Capstick. I spent some time with Todd at Hornady and visited with him about getting some 375 cylindrical brass. The Capstick is a great cartridge. However, If I were building one now, it would be Jeff's 470.

Ray- I'd also vote for Jeffes .470 vs either of the other two. You ain't gonna see 2500 fps out of either of them with a 500 gr bullet. Another alternative is the 470 Mbogo. an even more potent round also invented here on AR. I have two of them and it's a great caliber. Load em down if you want, but they will deliver the goods.-Rob

Ray, if your plan isn't to try to get more than 2300 fps out of a 500g bullet, I'd go with the Capstick. You can load it down to 470 NE levels (500g at 2150 fps) and it shouldn't kick much more than your 416 Rem shooting 400g bullets at 2400 fps. If you're looking for high velocity with a 500g bullet, then the 470 Mbogo would be the way to go.

Ray,
You can easily get a "perfect box" with either of the .475/.375H&H's you mentioned, or the 470AR,
but the advantages of the 470 Capstick or .475 Ackley are:
an extra round in the magazine,
and no "micro-rebated rim."
Plan on about 2300n fps max with a 23" barrel, and 500-grainers, with a .375H&H-based 470.
Just under 2400 fps MV with a 26" barrel. No pie in the sky.
Easily beats the 470 NE double rifle.
Gentle it down to your liking.
I did a 470 Capstick on a Winchester M70 Classic, with a 26" barrel.
The 470 Mbogo will do 2700 fps with a 24" barrel and 500-grainer, and an "imperfect box." I have the load and chronograph data to prove that too.

Ray- I have a 470 Mbogo reamer!!!!!!! And headspace guages Your paying me $150 till I get em back, but you know where they are and they are still sharp.-Rob

Ray:

Graf & Sons has Hornady basic magnum brass if you go with the Capstick. Here is the link:

http://www.grafs.com/retail/ca...oduct/productId/7108

Just trim and run through a sizing die and your good to go.

RIP brings up a good point about being able to get more cartridges down in the magazine with the Capstick. I hadn't thought of that.

I went the 475 Ackley route, as I lucked into a cheap set of dies some years back. Still haven't finished the whole project, but it makes a nice big hole so far (in the target and my wallet, lol). The 470 Mbogo is more of a good thing, on a par with the 460 Wby and such sized cases. I think that will be one of my future projects. - dan

All good information it seems, and the 2500 came off the top of my head as P.O. quoted very close to that..I realize P.O. didn't mind loading them right up there..

The fact is whichever one I build I will only be shooting at the same velocity as the my .470 N.E. and that is about 2020 or 2100 FPS. I have never had any trouble killing any thing big with that combination, so see no need for more soup..
I also like the idea of low pressure, no powder compaction with that bullet weight at that velocity..

I like the idea of not having to fireform or trim and all I have to do is stick a bullet in a cylinder belted magnum case, Keep things simple and leave the wildcatting to the baby boomers, I have already been that route!

When I get to it, and when finished I'll advise which version I used, and include test data..

I'll need the specs on Jeffs version.

You can go here for the .470 Acc Rel. You will to join to get the specifics.

http://ammoguide.com/?catid=606
Frank

the case drawing is in my signature, as well

thanks frank