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APS Big Boy!

 
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  #15  
Old 11-27-2009, 11:36 PM
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Re: APS Big Boy!

Quote:
Originally Posted by MachV View Post
Thanks Ernie and Kirby for turning that ich into a rash
now you just have to come to the 1000 yard pistol shoot in Sundance! I'm sure a few people would be happy to "spread" that rash!!
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  #16  
Old 11-27-2009, 11:55 PM
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Re: APS Big Boy!

Congrats Ernie, great looking rig!!!
Kirby made one awesome tool there.
Keep us posted on how it shoots.
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  #17  
Old 11-28-2009, 05:50 PM
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Re: APS Big Boy!

One more pic

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  #18  
Old 11-29-2009, 05:40 PM
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Re: APS Big Boy!

Just to add a bit more to what Ernie has offered. We have been pretty tight lipped about this for several reasons. The design is one that I designed many years ago but never really had the correct application for until Ernie contacted me about wanting an XP chambered for this class of chambering.

The real problem to this is the stock holding up simply because the XPs recoil lug is VERY limited in contact area to the stock and generally this small area will break down. On top of that, it is not uncommon not to have the stock crack at the top of the pistol grip with even much smaller chamberings then this.

My design uses a full diameter 1.350" diameter barrel shank that has a traditional XP recoil lug in the standard location but it also uses a conventional rifle recoil lug ahead at the front of the full diameter barrel shank. THe barrel is machined and threaded at this location and a custom made stainless steel lock nut is threaded on to hold the forward recoil lug in place.

I fully admit that the original idea came from a design that Darrel Holland uses for his V-block rifle design only that he uses an aluminum V-Block with a forward recoil lug but no rear recoil lug.

My design uses two recoil lugs which effectively triples the baring surface to the stock for the high recoil energy levels of this type of chambering. Also, I install a pillar just behind the forward recoil lug and thread the barrel to accept a 1/4x28 tpi mounting bolt. The stock is bedded for full contact up to the forward recoil lug and entire receiver. The lock nut is floated as is the barrel from the the nut forward.

The regidity of this system is simply amazing compared to conventional bedding and since there is no large aluminum bedding block, there is no problem putting this design in a slim sporter profile stock so weight can be kept down dramatically, as can the dimensions of the handgun.

I decided to have the 1.350" shank fluted on the top half to drop a bit of weight as well, plus it just looks good.

I have also been working on my new Raptor rifle package. Some of you may remember that project a couple years ago that did not turn out into production rifles but I have decided to start that project up again and have been working on that for the past year and it should hopefully be ready for field testing. The new Raptor will have a new receiver as well as a rifle version of this new barrel design to offer EXTREME rigidty but with very little if any increase in weight over a conventional barrel contour.

Anyway, the hold up in accuracy testing has been the wind. Its been blowing around here for nearly the past three weeks over 20 mph. Many days over 40 mph and several over 60 mph. I have never in my 36 years remembered a stretch of windy days like this. Was very hard on hunting and a killer for accuracy testing customer rifles and handguns which are backing up waiting to get on the range. Its supposed to cool down this week so I will hopefully be able to get out and so some long range accuracy testing with Ernies XP very soon.

Recoil wise, the 225s barely kick. I know many do not believe that but its true. The 250 gr ABs are not much more but a bit more. Still extremely comfortable. The 300 gr is not uncomfortable but its a noticable jump in recoil but then again, it is a 300 gr SMK at over 2700 fps!!!

More to come soon as well on the APS Raptor rifle. This is still in the prototype stage so no orders are being taken at this time for either platform but once they are fully range testing and proven they will be available.
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #19  
Old 11-29-2009, 11:22 PM
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Join Date: Nov 2006
Location: Colorado
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Re: APS Big Boy!

Howdy ..
A very nice piece indeed , I can totally understand the logic of that additional lug and the increased bedding area . these stocks can take a beating for sure .

But with a cartridge as big as a 338 Lapua Mag / Imp , was additional attention taken to the bolt , lugs and seats ? Those big cases with 100 grs of powder sure could raise some doubts using that XP action originally set up for the 221 fireball ...
I'm no gunsmith , but I am interested in your ideas
thanks

Ray
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  #20  
Old 11-30-2009, 03:18 PM
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Location: Harris. Pa.
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Re: APS Big Boy!

Real nice Ernie. I can't wait to hear some range reports, it must be killing you not to have it in your hands yet. ;)


You're right my .338 Lapua is a 20 inch barrel and my velocities are right with yours. With my 16 pounds of weight, recoil is very controllable with the 250's.

I'm having a .338 Norma mag built as we speak. It uses an XP action too on a McRee stock. I had the bolt made by Pacific Tool. I expect it to end up between 10-12 pounds overall weight sooooo I'm curious as to how heavy your rig is and how it reacts with 300 grain bullets. I'm going to start off using a pistol scope and then maybe move over to a rifle scope.

I went with a slightly longer barrel than yours as I'm hoping I can hit my velocity goals (300 grain at or near 2700fps) without pushing the pressure too high. I'm a bit apprehensive about using the XP action myself, but I researched it pretty well and the feeling from several smiths was that it would work just fine. I sure hope so.

Congrats again on a fine looking and I'm sure a fine shooting pistol!!!!
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  #21  
Old 12-01-2009, 12:00 PM
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Re: APS Big Boy!

There have been many talking about the strength of the XP which really suprises me. The XP-100 was designed many years after Remington had their rifle bolt actions on the market and are made to very similiar specs as far as the bolt head and bolt lug supports in the receiver.

If you look at a Rem 700 rifle receiver, the weak link in this receiver is the bottom bolt lug support because there is relatively little steel supporting this bottom bolt lug because of the mag box window cut out.

In the XP-100, there is nothing but solid steel supporting both the bolt lugs. The bolt lugs are of the same size as the full size Rem 700 and I have found no weakness in the Chrome Moly Rem 700 for chambering the Lapua class chamberings in this receiver.

I do have a problem with the Stainless Steel M700s being chambered in the Lapua class chamberings because the bolt lug supports are stainless steel and much softer then the Chrome Moly receivers. As such, you have a higher likelyhood that you will get some set back with the stainless receivers.

To be honest, if you load the Lapua to its proper levels, both receivers would handle this fine, its when some start to push the Lapua case to its limits that you get into trouble and will with any receiver because of the extreme strength of the Lapua case.

You can not load the Lapua up to where the primer pockets just start to loosen and consider that a max working load as you will be WAY over pressure for any factory receiver, well, any receiver at all to be honest.

If your concerned about pressures, do load development with Norma 338 Lapua cases which are similiar in strength and hardness to Remington RUM cases and their primer pockets will show pressure signs MUCH sooner then the Lapua case. Then once you have your load data worked out you can go over to the stronger Lapua cases and use them for your loads.

Simply put, the XP-100 is a stronger receiver then the 700 for sure and if loaded correctly, they will easily handle any wildcat based on the Lapua case.
__________________
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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