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super .338's

 
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  #8  
Old 03-05-2007, 04:31 PM
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Re: super .338\'s

Yes i believe the 30" barrel will push the 300MK bullet 3300 fps... 338AM or my 338 Snipe-Tac chamber. The 408 case is very versitile to build from, case prices are pretty good for such a large piece of brass. If you don't over pressure the case it will last for quite a while. I have some that have 8 loadings on them, still working fine. With any big magnum case life will be shorter with top loads. 3400 fps loads is about top with the 300MK bullet, or the cases will suffer. I have pushed them to 3500 fps! Imagine a 250grn bullet @ 3650 fps! 200grn Nosler 3900fps, no pressure signs, But not practical.

I am just finishing up a rifle with a 30" ABS carbon bbl. Full length Stainless single shot action, carbon stock, 30" carbon bbl, 4 port Ti muzzle brake. 11.5# rifle weight. I will post some pics later.
The rifle will have a Nightforce 5.5-22x56 scope sitting on top. Total weight should be around 14# I will post the chrono results, i doubt if the 2 inch shorter bbl will result in 50fps drop in speed. I think a 28" barrel can be done and still get very good results. 36" barrel will produce the maximum velocity for this case to bore size ratio. If you want a hot rod 338, then these are it, for a shoulder fired weapon that can meet the weight restrictions for some western states big game hunting regs. Just shy of 9,000# muzzle energy, it is a true long range rig. They are a hoot to shoot as well!

Dave
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  #9  
Old 03-05-2007, 09:25 PM
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Hoot to shoot!

That's really the effect I'm after!

When I was a boy of four, my dad took a picture of me in my plastic camo "army guy" helmet holding his kit built .50 caliber muzzleloading pistol across my lap. I remember quite vividlythat this thing was so heavy I could barely pick it up.

Later that year, in the summer (soon after my fifth birthday, in fact) my dad took me out to a sandpit where he did most of his shooting. He samt me on his lap, and haled the gun for me, allowing me to take grip with him and touch the trigger off.

I had a grin on my face for the next month that all of the rain and boredome in the world couldn't wipe off! I was permanently hooked on BIG guns!

In more recent years, I have tried my darndest to remain "reasonable". My first deer gun was a marlin 336C in .30-.30. A more "reasonable" New Hampshire Whitetail gun couldn't be imagined. More recently, I traded in the ol marlin and shelled out some extra cash. My wife has shown an interest in hunting. We've been out in the woods together on several occaisions, and she's always listed aptly when I got overexcited about tracking and stalking whitetails. She's put in more homework than she realizes, and will probably make a rather decent hunter in time. First, I gotta teach her to shoot!

I took her to the Kittery Trading Post, and went through the beginners primer on rifles. Action types, their operation, and some basic pro's and con's. She fell in LOVE with the synthetic NEF handi rifle. She never even got to see the price tag. As a reward for being so patient with her and walking her through dozens of rifles, she said I could get a gun (that day, at that store) too. I bought my Ruger #1B chambered in the same .243 Win as her handi rifle. I figured if I was going to be loading for my own rifle, we may as well share components and dies, as she has no interest in loading for herself.

Thus far, I have firelapped the bore, floated the barrel, and done a bit of tweaking with the quarter rib to eliminate scope movement. Out to 500 or so yards, I can usually maintain groups between 3 and 5 inches, with most (admittadly not all) fliers being shots I call off before checking. I could be wrong, but I think I'm begginning to push this factory built rifle to its limits, and I want to step it up!

Since I'm stepping it up a few notches, I really am less inclined to be so "reasonable" about it this time. Now, I'm not a rich man. Far from it, but I figure, I can afford bits and peices. Very soon, I'll be buying an unchambered barrel blank (for a 32" finished length) in .338. I'll oil that down and put it away somewhere cool and dry, cleaning it out and reoiling occaisionally until I can finish the project. Once I have the barrel, action (I won't settle for less than a borden or bat, or similar for this project)and stock, I will of course need dies. Then I need to save my last payment for gunsmithing, so this project can be a reality!

The more I think about it, the more I am leaning towards the Allen Mag or snipe tac. I've done a bot of background readin, and both sound like superb cart's. I'm not so sure about the neccessity to improve the already huge 408 case for a 338 bore, but hell, if I'm not being quite so "reasonable"...

In the meantime, I hope to be doing some much less expensive research into radically improving barrel life! I have some very promising leads in that direction, but no conclusive evidence yet.
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  #10  
Old 03-05-2007, 10:03 PM
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Re: Hoot to shoot!

dzaw, how does that nef shoot?
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  #11  
Old 03-05-2007, 10:56 PM
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Re: Hoot to shoot!

Dzaw,

The straight neck down of the 408 to 338 has been done, you will loose about 150 fps over the improved case designs. Improved cases will burn the powder more efficently. I would recomend a Lawton 8000 action for any 408 type build.

Keep thinking,

Dave
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  #12  
Old 03-05-2007, 11:19 PM
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Still thinkin

Screech - I'm not sure how it shoots, she won't let me shoot it. Every time I ask she tells me "you got your own... This is MY gun..." She shoots 6-7" at 100 Yds (most of the time) with it. She is getting better though.

BD408 - Thanks for the tips! Always thinking, but it can get me in over my head sometimes! Any particular reason for the Lawton over say, a borden, bat, or even your own?
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  #13  
Old 03-06-2007, 10:35 AM
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Re: Still thinkin

The Lawton M8000 is a solid receiver. Big however at 10" in length. There are also only a couple stock options available for this receiver unless you have a stock custom inletted, $$$$!!

That is not all bad however because Manner stocks offers the MCS-T1 which is an A-5/A-3 hybrid I think he told me. I have a couple of these on order for M8000 receivers.

Juel Russo also inlets his big A-5 style laminated wood stock for the M8000. Great products but heavy. Great for bench shooting.

BAT offers several receivers that would work very well ranging from the HUGE 10"long by 2" diameter receiver down to the very compact 8.5"x1.55" diameter receivers. If you want to build a lighter weight rifle in this type of chambering, the BAT 8.5 is a very good choice.

If you want to build a heavy rifle like my Black Sunshine, the big 10"x2" diameter is the way to go as it will handle any barrel up to a 40", 1.750" diameter straight cylinder barrel.

The Lawton however will probably get to you much sooner then the BAT but both are good receivers for such a project.

The nice thing about the BAT receivers is that McMillan inlets many of their stocks for these receivers.

Kirby Allen(50)
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  #14  
Old 03-06-2007, 12:22 PM
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Re: Still thinkin

Thank you ever so much!

The information people here have been willing to share at the drop of a pin has been incredible! I really have stumbled onto the nicest people on the internet anywhere!

That being said, I'm looking to do a rifle in the 18-20 ish pound catagory, scope included. Naturally, as light an action as I can get means a heavier barrel, but I don't want to compromise rigidity either.

Hmmm. That MCS T-1 is a decent looking stock. How's the comb? Is it to narrow or sharp? (I hate that!)

I was looking at these folks quite seriously:
http://www.robertsoncomposites.com/h...osites800.html

as one of the services they offer is gound up custom mold design for even as few as 1 stock... A bit pricy, but I'll only ever be able to do this once (if that) and so it doesn't make sense to settle for less than perfect.

Of course McMillan has a great product as well, lending some decent credence to the BAT idea...

I never knew food for thought could be so nutritious!
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