New 6mm With Mausingfield Action

This is my new build. It is a 6mm Comp Match, a modification of the 243Win similar to the 243 AI but retaining the original taper and having a 37 degree shoulder.  The chamber is made by Long Rifles Inc. in Sturgis, SD. The cartridge can be fire formed from a 243 Win cartridge (in the pic to the right of the loaded 6CM) by the method I described in another post (see" Deck's 7mm WSM Brass Problem Solved")  The gun can shoot the new experimental 96gr PICBM (Jason thinking again) bullet (G1BC 0.545) using Retumbo at or beyond 3200 fps.  The Mausingfield short action is super smooth, has controlled feed and will accept single feeding without putting the shell in the mag first. The stock is a $250 Magpul 700 Hunter stock. I dropped right in with only a slight amount of inletting to allow for the side mounted bolt release.  The funky looking bolt handle is quite comfortable and functional.  Magazine is an American Rifle Co. 10 round center feed mag that will fit any AI Magazine compatible bottom metal and will accommodate 2.955" OAL ammo.   The Muzzle brake will fit Thunder Beast suppressors. Mine works great with the 338 Ultra which I can use in my 308 or 338 rifles as well. Still in load development but the rifle is capable of 1/4 MOA groups.  Barrel is a K&P 5R 1:7 twist barrel.  This cartridge/bullet combo has a flatter trajectory and better windage at 1000 yds than a 260 Rem shooting a 140gr 0.6 G1BC bullet. Barrel life is supposed to be around 3000 rounds. Perfect for Antelope

Edited by nralifer - December/20/2017 at 19:33

Sounds like a really great rifle.  I've been wanting a Mausingfield action rifle.  I just can't decide what I want it to shoot (caliber).  

We are going to get individualized drag curves for some of the ICBMs. The weird thing is that at at low Mach numbers drag starts to increase then drops off rapidly as the bullet becomes subsonic. One guy told us that for the 250 SICBM the BC we quoted he thought was low since he was hitting high at 1750 yds. A rough estimate of G7 BC is half the G1 realizing that below Mach 1.4 the Von Karman function governing the ogive shape of our bullets is more efficient at low Mach numbers that are the secant or tangent functions.

One thing about the Mausingfield is that if you can bare to use a barrel nut you can use barrels threaded for Savage actions. If you are conflicted about calibers get barrels for both👍

It simply is the most versatile bolt action there is, and is the one that will maintain the bullet as perfectly aligned to the bore centerline as possible.  Anything with a plunger extractor puts an eccentric force on the cartridge so if there is space there will be some misalignment to the cartridge.  If you can stand a barrel nut, changing barrels is a 15 minute process, so if you wear out a barrel, no gunsmith bill needed.

Edited by nralifer - December/20/2017 at 19:34

I actually spoke with Lori about this… she wanted to order me one for Christmas.  I explained that it would take a little more time than that to meet my complete set of requirements for building this rifle.  Now I'm on the hunt.  

nralifer wrote: Ha! I knew you liked the 338-06  You will like it even more shooting these high BC all copper missiles in the AI version from that long, silky smooth, superbly aligned, tuned, flawlessly feeding and accurate Mausingfield. The 225gr Bulldozer and the 234 ICBM (BCs 0.64 & 0.66 respectively) will have more energy at 300 yds than the 6.5 Creedmoor has at the muzzleDeadly

That's the reason I like it… I have Christmas tree ornaments exactly like that (different color).  I may paint it if I get one…

or vanilla chocolate...

supertool73 wrote: I just gotta say why a magpul stock? Such a beautiful setup and then that stock. Just a little ribbing is all ;).

Agreed 😂

Lori gave me a "thumbs up" on the Mausingfield in 338-06 with a Cadex chassis.  There are some specifications to work out, but looks like I'll be making some orders sometime after the first of the year.

I love my Mausingfield. Built mine in 22-250. Have a second action sitting in my safe if anyone want to buy it. Or until I decide what else to build.

Peddler wrote: supertool73 wrote: I just gotta say why a magpul stock? Such a beautiful setup and then that stock. Just a little ribbing is all ;). Agreed 😂

This^   Rifle is a piece of art. Then put it in that stock. One of these days I'll talk him into good stocks.