Tony K Harper
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I came across this post on another site and I wonder what you guys think of it.
I know nothing about these actions, so I certainly don't know what to think.
If they really shoot as well as claimed, they are away ahead of the ones commonly used in RFBR.
Someone please shed some light.
TKH
Here is the Post:
Up until the RimX design was released, your traditional 22LR rifles used extractors with timed extractor grooves cut into the barrel tenon. Also, chambers were cut and headspace was set based off the match ammo you planned to shoot. This is because Eley for example to explain, required less headspace than say Lapua. So if you cut an Lapua based chamber (0.041 - 0.43") and shot Eley for example, you risk the round moving forward under ignition when struck by the firing pin with it being shorter because nothing in a traditional 22LR captured and held the case against the bolt face. In turn, this results in inconsistent ignition which in turn affects accuracy.. This is pretty standard common knowledge stuff for your knowledgeable 22LR smiths.
This is how most of us built custom high end match 22LR up until the RimX dropped. I was one of the first to receive a RimX from Zermatt before its release for testing and review. When Zermatt was explaining to me their new design and how it works and how to cut barrels, it was different than what we all knew and was hard to believe because what we all knew about making a high end accurate 22LR up until this point. When talking with Ray in those early days, he was telling me this action you don't set headspace based off ammo, there is no need and they have a recommended headspace which is much larger than what we all knew for say Eley and Lapua ammo... (Its been a long time since I looked at this data but I believe Zermatt's tenon print calls for a minimum 0.0455 or 0.046" headspace I could be slightly off on these numbers)...
He explained why.. because the RimX, by design, used a tensioner which captures the 22LR round out of the mag and holds it against the bolt face at all times. Because of this, you have consistent ignition on every case because the case cannot move when struck by the firing pin. Because of this, headspace wasn't as important compared to your traditional 22LR's where it was EXTREMELY important.
Once I got the first barrel cut and installed on the test action and got some rounds down it, I realized what Zermatt was saying. In my initial 10 barrel review and testing I produced some unbelievable accuracy numbers and consistency with those numbers. This was unseen in this type of prefit type rifle and not matching headspace to my ammo up until this point. I shot 50rd AGG's @ 50yd in the 0.1's with multiple barrels and multiple different types and lots of ammo! I shot 5rd 50yd groups in the 0.0's, my personal best at that time. I shot 100yd 50rd AGG in the 0.5's and 6x5 30rd AGG's in the 0.3's and 0.4's, another personal best at the time.
Here we are just over 4 years later and I think the RimX performance speaks for itself. I dont know of any other 22LR designed or operating like a RimX which is why I stand by my comments that its a revolutionary design. Barrels can be made cheaper and faster. No more painstaking work of meticulously timing and cutting extractor grooves into barrel tenons so they line up perfectly when the barrel it torqued on and the smith needing the action in hand for extended periods to do all this... No more cutting headspace to match the ammo the shooter plans to use for optimal accuracy. Buy a prefit, screw it on and go shoot with unheard of accuracy and consistency up until the RimX was released. Want another barrel, maybe different length or contour, no problem, keep shooting your current barrel while you wait for the new barrel to arrive. Again, unheard of up until the RimX hit the scene....
With this design, someone can buy a RimX, pick up one of many high end match grade prefit barrels from various sources instantly and be shooting an extremely capable and accurate rifle the next day with various types of high end match grade ammo. The average shooter couldn't do this before, and not without a long wait time on a custom 22LR smith and a lot of money.
Thats my $0.02 on the RimX and I hope that answers your question.
Last edited: Jul 11, 2024
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I know nothing about these actions, so I certainly don't know what to think.
If they really shoot as well as claimed, they are away ahead of the ones commonly used in RFBR.
Someone please shed some light.
TKH
Here is the Post:
Sure..
Forgive my ignorance if this is common knowledge, Can you expand on your comments above in yellow especially on revolutionary design?
Up until the RimX design was released, your traditional 22LR rifles used extractors with timed extractor grooves cut into the barrel tenon. Also, chambers were cut and headspace was set based off the match ammo you planned to shoot. This is because Eley for example to explain, required less headspace than say Lapua. So if you cut an Lapua based chamber (0.041 - 0.43") and shot Eley for example, you risk the round moving forward under ignition when struck by the firing pin with it being shorter because nothing in a traditional 22LR captured and held the case against the bolt face. In turn, this results in inconsistent ignition which in turn affects accuracy.. This is pretty standard common knowledge stuff for your knowledgeable 22LR smiths.
This is how most of us built custom high end match 22LR up until the RimX dropped. I was one of the first to receive a RimX from Zermatt before its release for testing and review. When Zermatt was explaining to me their new design and how it works and how to cut barrels, it was different than what we all knew and was hard to believe because what we all knew about making a high end accurate 22LR up until this point. When talking with Ray in those early days, he was telling me this action you don't set headspace based off ammo, there is no need and they have a recommended headspace which is much larger than what we all knew for say Eley and Lapua ammo... (Its been a long time since I looked at this data but I believe Zermatt's tenon print calls for a minimum 0.0455 or 0.046" headspace I could be slightly off on these numbers)...
He explained why.. because the RimX, by design, used a tensioner which captures the 22LR round out of the mag and holds it against the bolt face at all times. Because of this, you have consistent ignition on every case because the case cannot move when struck by the firing pin. Because of this, headspace wasn't as important compared to your traditional 22LR's where it was EXTREMELY important.
Once I got the first barrel cut and installed on the test action and got some rounds down it, I realized what Zermatt was saying. In my initial 10 barrel review and testing I produced some unbelievable accuracy numbers and consistency with those numbers. This was unseen in this type of prefit type rifle and not matching headspace to my ammo up until this point. I shot 50rd AGG's @ 50yd in the 0.1's with multiple barrels and multiple different types and lots of ammo! I shot 5rd 50yd groups in the 0.0's, my personal best at that time. I shot 100yd 50rd AGG in the 0.5's and 6x5 30rd AGG's in the 0.3's and 0.4's, another personal best at the time.
Here we are just over 4 years later and I think the RimX performance speaks for itself. I dont know of any other 22LR designed or operating like a RimX which is why I stand by my comments that its a revolutionary design. Barrels can be made cheaper and faster. No more painstaking work of meticulously timing and cutting extractor grooves into barrel tenons so they line up perfectly when the barrel it torqued on and the smith needing the action in hand for extended periods to do all this... No more cutting headspace to match the ammo the shooter plans to use for optimal accuracy. Buy a prefit, screw it on and go shoot with unheard of accuracy and consistency up until the RimX was released. Want another barrel, maybe different length or contour, no problem, keep shooting your current barrel while you wait for the new barrel to arrive. Again, unheard of up until the RimX hit the scene....
With this design, someone can buy a RimX, pick up one of many high end match grade prefit barrels from various sources instantly and be shooting an extremely capable and accurate rifle the next day with various types of high end match grade ammo. The average shooter couldn't do this before, and not without a long wait time on a custom 22LR smith and a lot of money.
Thats my $0.02 on the RimX and I hope that answers your question.
Last edited: Jul 11, 2024
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