Which LW (.22) caliber barrel blank for my RAW HM1000x

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SpiralGroove

SpiralGroove

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Oct 20, 2020
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Washington, United States
Thinking of buying a .22 caliber LW barrel blank for my RAW HM1000x.
Will machine to fit on my lathe, but wondering if another LW Poly no-choke or LW standard barrel w/choke is best?

It's my understanding all OEM RAW HM1000x's come with a LW Poly no-choke, so assumed this was The Choice?

I will shoot both pellets and slugs between 50 and 100 yards only.

Will likely buy a LW Poly no-choke unless someone has already done this and/or has a better idea:unsure:.

Kirk
 
Hi Kirk,
When I spoke to Martin awhile back to order a .22cal barrel, I originally asked for a .22cal poly choked barrel. I told him what I wanted it for (high power pellets shooting at around 40 - 45fpe). He suggested that I go with the UNCHOKED barrel for this high power. I haven't mounted the barrel yet, but certainly trust Martin that this is the way to go for my intended application. I just don't really know how well a poly barrel does with the various slugs available???

Good luck and have fun with this project!
 
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Green_Yamo said:
Hi Kirk,
When I spoke to Martin awhile back to order a .22cal barrel, I originally asked for a .22cal poly choked barrel. I told him what I wanted it for (high power pellets shooting at around 40 - 45fpe). He suggested that I go with the UNCHOKED barrel for this high power. I haven't mounted the barrel yet, but certainly trust Martin that this is the way to go for my intended application. I just don't really know how well a poly barrel does with the various slugs available???

Good luck and have fun with this project!
Click to expand...
Green, I have been shooting JSB 18gr and NSA 17.5gr through my .22 poly unchoked both with the same accuracy as long as I clean the barrel before shooting slugs, just 1-2 clicks in windage difference, pellets @ 950fps and slugs @ 935. Gun is de-tuned for lighter ammo than OEM stock configuration. With this poly barrel, you just need to find a slug whose diameter gives the slug the best spin characteristics for accuracy, mine is .2175 in diameter, your mileage may vary depending on your barrel and mine needs a snug fit into the breech (some good resistance when loading) and lands/grooves.
 
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The LWs with the .215/.221" bore/groove diameters are tricky with slugs for a number of reasons. Unlike skirted pellets, slugs will not fully obturate with that large groove diameter unless they're designed to expand, so that can cause a number of issues with consistency and precision (due to a number of variables). Certain types of slugs work better than others.

One of the big keys to getting the most precision from slugs is ensuring that the smallest diameter of the bore is correct for the ammo. If it's too tight or too large, it's going to shoot like poop. Lapping the bore / lands to appropriate size without increasing the groove diameter proportionally is tricky. There's also considerations that have to be made with the choke geometry for the projectile that barrel is being tuned for.

I personally like the LW with chokes in each caliber, but they take a few surgical lapping sessions before they're shooting the way that I want them to. I also prefer the stainless over their DOM tubing barrels.

My $0.02.
 
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Ranchibi said:
Kirk, as you know, the LW poly unchoked are not very ammo fussy. That said, you also might give THammer a PM and see if he has a TJ 4 groove non choked you could fit, same ones used in AAA guns now.
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The TJ barrel used in EVOL 22 is our own proprietary design and tooling. It is not the same as the Troy Hammer barrel and is not available to the public.
 
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How one can guarantee that the muzzle end is the tightest part of the bore if there is no choke?

mtnGhost said:
The LWs with the .215/.221" bore/groove diameters are tricky with slugs for a number of reasons. Unlike skirted pellets, slugs will not fully obturate with that large groove diameter unless they're designed to expand, so that can cause a number of issues with consistency and precision (due to a number of variables). Certain types of slugs work better than others.

One of the big keys to getting the most precision from slugs is ensuring that the smallest diameter of the bore is correct for the ammo. If it's too tight or too large, it's going to shoot like poop. Lapping the bore / lands to appropriate size without increasing the groove diameter proportionally is tricky. There's also considerations that have to be made with the choke geometry for the projectile that barrel is being tuned for.

I personally like the LW with chokes in each caliber, but they take a few surgical lapping sessions before they're shooting the way that I want them to. I also prefer the stainless over their DOM tubing barrels.

My $0.02.
Click to expand...
Which grit do you use for the lapping? Do you pour liquid lead into the bore?
 
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Green_Yamo said:
Hi Kirk,
When I spoke to Martin awhile back to order a .22cal barrel, I originally asked for a .22cal poly choked barrel. I told him what I wanted it for (high power pellets shooting at around 40 - 45fpe). He suggested that I go with the UNCHOKED barrel for this high power. I haven't mounted the barrel yet, but certainly trust Martin that this is the way to go for my intended application. I just don't really know how well a poly barrel does with the various slugs available???

Good luck and have fun with this project!
Click to expand...


My RAW HM1000x .22 HP with Poly did not do well with slugs. Martin built and tuned for JSB 25.39 at 935-940 FPS. Shoots great and very accurate, but only with pellets. YMMV

Tom
 
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Seeker said:
How one can guarantee that the muzzle end is the tightest part of the bore if there is no choke?


Which grit do you use for the lapping? Do you pour liquid lead into the bore?
Click to expand...
I always use Cerrosafe to measure. My lapping grit can vary from 220 grit and up depending on the barrel and other factors. A bore doesn't have to be tight at the choke, but a micro taper throughout the bore can be advantageous.
 
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