RIMX Rabbit Whole

skwerl

skwerl

CGN Ultra frequent flyer
Uber Super GunNutz
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Location
Okanagan Valley B.C.
Final compilation of this endeavor.

Action - Zermatt Arms RIMX - .22lr
Barrel - PVA Bighorn M-24 (24'') 1/12 Twist
Trigger - Triggertech 2 stage Diamond
Stock - WOOX Chassis
Magazine - 10 round w/5 extension
Tuner - Red Nobb
Scope - Delta Stryker HD 5-50 X 56 MRAD
Bipod - Mystic Precision MPOD

Range trip trial this Sat.
...skwerl
 
Sat. range trip was educational , I had not handled a RIMX at all before .

I start my rifles on SK STD Plus to C how they group then go to Eley Team

well the SK didnt chamber at all and the Eley printed rifling on the whole bullet

and chambered hard.

Consistency is xlnt with ELEY tho I'm looking at another brand

to chamber a little lighter possibly Lapua .

Any suggestions ?

...skwerl
 
Your headspace has to be wrong. Lapua and SK ammo have a 43 thou rim and eley is 40 thou. Only way I know of to fix that issue without a barrel nut set up is shim your barrel from the action or re-chamber the barrel to give proper headspace.

I would be contacting whoever you got it from, it is not headspaced correctly.
 
Poffels said:
I would be contacting whoever you got it from, it is not headspaced correctly.
Click to expand...

I'm thinking along the same lines. My TS Customs Benchmark will chamber Eley, SK/Lapua and RWS just fine with engraving on the first driving band of the bullet.

Now here's the interesting bit. My understanding is that optimal HS for the Rim X action is 045. With the extractor & tensioner removed, my bolt will close comfortably on a Forster 043 GO gauge. It will also close with little resistance on the Forster 046 NO GO gauge! TS Customs & Primal Rights in SD know a little bit about Rim X and have built plenty. I have never had a FTF and the rifle is pretty much on a par with my Vudoos in the accuracy department. I shoot SK/Lapua but the rifle runs well on Eley Match with no function issues at all.
 
skwerl said:
Sat. range trip was educational , I had not handled a RIMX at all before .

I start my rifles on SK STD Plus to C how they group then go to Eley Team

well the SK didnt chamber at all and the Eley printed rifling on the whole bullet

and chambered hard.

Consistency is xlnt with ELEY tho I'm looking at another brand

to chamber a little lighter possibly Lapua .

Any suggestions ?

...skwerl
Click to expand...

As was mentioned, you now have a 2 part problem. The headspace is shorter then typical.. AND the throat is shorter/tighter then typical.

You have a combo geared towards thin rim ammo like Eley... if the headspace is indeed well under 0.043", SK and lapua (and many other brands) will not chamber ... period!

I would try and find some eley match or tenex and see if these chamber a little easier. Maybe a high grade of RWS.

If you want to shoot SK/Lapua, you will need a different chamber to be cut (headspace adjusted and likely throat too). This level of engraving is often used in benchrest rifles where you are using a specific ammo and want the highest chance of accuracy.... and can deal with stiff chambering.

Not ideal for a use like PRS or varminting.. or if multiple types of ammo are desired to be used.

If this was a gunsmith install, discuss remedies. If you bought this as a barreled action, maybe there can be supplier support????

Jerry
 
I tried a insert by hand suggested by another CGN'er , a firm/hard

push .

This looks the same RWS & Eley , just a matter of adjustment

on my part , I'm used to 1710's & CZ MTR's .

...skwerl
 
Very nice, has a French FR2 vibe going on.

I like my Mpod as well but doesn't work with my bag rider I made on my 1403. I miss having fine tuning ability. Then trying to slide a leg out a mm at a time.
 
I tried a insert by hand suggested by another CGN'er , a firm/hard
push .

This looks the same RWS & Eley , just a matter of adjustment
on my part , I'm used to 1710's & CZ MTR's .
...skwerl

sorry double tap
 


Skwerl...If that is as far as that bullet will go into the chamber with a firm push, I'd say you definitely have too short a chamber there.

I have a number of true match chambers here done with different 22LR reamers and an SK round will go further into all of them than that.

Hard to tell from that image but if you know who chambered that barrel, I'd be sending that image to him - Better still to have a chat if possible.

Here are a couple of links - TS Customs 1.5 degree Primal Chamber & engraving on fully chambered SK rounds.

wLfTWosm.jpg




Jerry - If you see this, I found an action wrench right here in Aus - A shop in Melbourne had one!

laNq0Pnm.jpg
 
The problem may be more to do with the bullets involved rather than the rifle's headspace. It may be chamber length, but perhaps it's something else.

Eley EPS bullets and Lapua bullets have "drive bands" that are different. The Eley drive band is not as long as that on Lapua bullets. Below are pictures that illustrate the difference. The shooter who posted these images in 2017 on rimfireaccuracy.com says the Eley drive band is about 0.5mm (or .02") shorter. This means the Lapua bullet will engage the rifling before the Eley bullet.

The headspace should be such that both Eley and Lapua (and other match ammo) can be used without issue. As no one knows what ammos will be available and their pricing in the years to come it doesn't make sense to restrict a set up needlessly to somehow favour one brand or another. A safe headspace will not affect accuracy nor will a tighter than necessary one improve it with any make of ammo.

As others have noted, the chamber may be too short in length. Alternatively, the leade is too abrupt, with its angle not sufficiently shallow.

The Eley bullet is on the left in the picture below.



 
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