Airgun Benchrest Barrel Question!

Actually,

Yes, I do have the correspondence between me and Ron Sinnema still on my HD. I'm awaiting his return call now.
 
Did they give you any indication about how many barrels could be made with your tooling before it wears beyond tolerance? Do you have any idea how many barrels have been made?
Dan

therealld said:
Actually,

Yes, I do have the correspondence between me and Ron Sinnema still on my HD. I'm awaiting his return call now.
Click to expand...
 
re:
"DanB

Did they give you any indication about how many barrels could be made with your tooling before it wears beyond tolerance? Do you have any idea how many barrels have been made?"
-------------------------------------

Yes, quite a few, drills are first to go, but aren't unique to this barrel, and though a reamer did break at around #7 of the first ten, and it was considered a defective tool and a new one was made. Apparently the rifling button can do hundreds. Do you think some folks are waiting for the tools to be replaced? I guess thirty to forty have been made, with more on the way.

They are pretty busy right now, and not interested in taking on more new work right at the moment.
 
for anyone who has a benchmark 2 groove .22 barrel, with .213" bore diameter, with a .216" tapering to .2157" groove diameter, would any of you know the twist rate of this barrel? is this just a re-purposed rim fire barrel? thanks for all the input guys!
 
The 2 groove Benchmark airgun barrel I looked at had narrower lands than the rimfire barrel I have from them, I couldn't tell if the land height was different. I have a 3 groove on order for my TM1000 that should be here in a few weeks and I'm looking forward to trying it out. Call Benchmark, they have always been happy to answer my questions.

Dennis
 
Benchmark barrels .22 mac1 ,.22 2 groove ,.25 cal 3 groove chip and Gordon

YEMX said:
Hello all, new to the forum, and the sport. currently putting together a M-rod to get my foot in the door and get shooting! I cant wait until it's done, so i can get to some comps. I am also setting aside parts for a better bench gun to put together later as funds allow. im going to use a Dawson reciever and one of his trigger units- from what i see, its primo stuff. the barrel however is what's got me scratching my head. I've only ever used/bought Lothar Walther barrels, and I'm putting one on my M-rod. I have seen some other names- Benchmark, Krieger...and im not saying they dont do airgun barrels because obviously they do if you guys are using them- but how would i order one from them? I have never ordered a completely custom barrel from a "real" (i dont consider LW a real barrel maker for some reason) barrel maker. any help from you guys would be greatly appreciated!! cant wait to see you on the benches!
Click to expand...

Hi
I used Jim Gaska's LW .177 on my Mrod in both LV and HV setups and they shoot very good but you need a reg to the most out of them . I also own 2 Ld/mac1 benchmark one on my HV BR USFT and one on my FT USFT both shoot very very very good but all the variables have been dialed in on them , this means right pellets ,right fill and reg, pressure and details tuned . I also own a .22 benchmark BR 2 groove thats 27"x.75" on my unlimited gun that's not tapered the same which Tim and I slugged the seems to be not as smooth a taper for what ever reason. a mac1 feels smooth as you move close to the bore and tightens smoothly till the end . This one seems to have two spots that tighten as you move to the muzzle it was setup as a unlimited gun shooting .15.9 jsb at 890 . And shot very very good at both 25 m and 50 yds . That was replaced with a .25 cal 3 groove which was setup for .jsb 25.4 by chip and Gordon its 31" x .75 " with no step in a custom barrel Block . It shoots right at 43 fpe and is great at 50 yds . The quest for barrels is limitless.
But having good platforms to test them on is a must .

Pellets are the next limitation , as I only really have2 choices for .25 cal I'm having a mac1 .22 in the same specs as the .25 31" and .75" . Made . As it opens the options for unlimted class at 50yds I hope to shoot some .22 jsb monsters in it .
 
Wayne Burns said:
YEMX,

Welcome to bench rest! We bought a group of .177 cal Crosman barrels for our Marauder BR rig... as well as some LW match grade. We also have a great shooting Benchmark .22 cal on an Open class USFT that has shot 250s outdoors. We found that some of the Crosman barrels are as good as any we have tried.. You have to "de-burr" the transfer port etc.. but you could find a 250 shooting Crosman barrel, just as easily as anything else... at a lot less cost:)

Wayne Burns,
Match Director,
Ashland Air Rifle Range
Click to expand...

So, how does one go about buying a few Crossman Barrels?

Thanx,

Pete
 
linzie said:
Hi
I used Jim Gaska's LW .177 on my Mrod in both LV and HV setups and they shoot very good but you need a reg to the most out of them . I also own 2 Ld/mac1 benchmark one on my HV BR USFT and one on my FT USFT both shoot very very very good but all the variables have been dialed in on them , this means right pellets ,right fill and reg, pressure and details tuned . I also own a .22 benchmark BR 2 groove thats 27"x.75" on my unlimited gun that's not tapered the same which Tim and I slugged the seems to be not as smooth a taper for what ever reason. a mac1 feels smooth as you move close to the bore and tightens smoothly till the end . This one seems to have two spots that tighten as you move to the muzzle it was setup as a unlimited gun shooting .15.9 jsb at 890 . And shot very very good at both 25 m and 50 yds . That was replaced with a .25 cal 3 groove which was setup for .jsb 25.4 by chip and Gordon its 31" x .75 " with no step in a custom barrel Block . It shoots right at 43 fpe and is great at 50 yds . The quest for barrels is limitless.

But having good platforms to test them on is a must .

Pellets are the next limitation , as I only really have2 choices for .25 cal I'm having a mac1 .22 in the same specs as the .25 31" and .75" . Made . As it opens the options for unlimted class at 50yds I hope to shoot some .22 jsb monsters in it .
Click to expand...


I am really looking at getting a USFT in the future, and was wondering how hard is it to set up for .25? I looked on Mac1's page, and all he had listed were .177,
.20 and .22.

Thanks to all for all the info and help!
 
Usft .25

YEMX said:
I am really looking at getting a USFT in the future, and was wondering how hard is it to set up for .25? I looked on Mac1's page, and all he had listed were .177,
.20 and .22.

Thanks to all for all the info and help!
Click to expand...
I ordered the barrel from benchmark myself as well as the custom barrel block from Murphy precision , Tim did all my barrel work and dialed it in to get it to the magic 890-900 fps mark . You should use a hpa model because you can have 3000 psi 22" regged bottle which gives me 60 good shots with 25.4 jsb pellets. Steve George inspired me to try this combo and chip and Gordon had benchmark start making .25 barrels . , its a great combo , Tim will build you one .
Ciao
Linzie
 
linzie said:
I ordered the barrel from benchmark myself as well as the custom barrel block from Murphy precision , Tim did all my barrel work and dialed it in to get it to the magic 890-900 fps mark . You should use a hpa model because you can have 3000 psi 22" regged bottle which gives me 60 good shots with 25.4 jsb pellets. Steve George inspired me to try this combo and chip and Gordon had benchmark start making .25 barrels . , its a great combo , Tim will build you one .
Ciao
Linzie
Click to expand...


awesome! Linzie, if you don't mind me asking- what is the purpose of the new barrel block? and I see that your rifle has the long reservoir, and not a regulated bottle- is your rifle regulated? how does your rifle shoot non-regulated if it is not? does the fact that the reservoir extends further out than the barrel have any effect on your accuracy? Thanks again!
 
Oh sorry it's been revised since that pic

YEMX said:
awesome! Linzie, if you don't mind me asking- what is the purpose of the new barrel block? and I see that your rifle has the long reservoir, and not a regulated bottle- is your rifle regulated? how does your rifle shoot non-regulated if it is not? does the fact that the reservoir extends further out than the barrel have any effect on your accuracy? Thanks again!
Click to expand...

The gun now has a regged 22" bottle on it and the benchmark .25 , the pic with the long tube was it with a .22 benchmark which was not regged and shoots very well , was concerned about blast effect on that gun but it seems fine it will shoot 250 's at 25m . I'm have that set up redone with a long tube unregged as my open gun . . but We decided to go HPA to get a min. Of 40 shots in .25 at max power which is 45 fpe . The big barrel block lets me use .75 dia. Barrels which I think is a big plus this was Steve's design . And also makes indexing a bit easier . The next test is with a mac1benchmark .22 31" x .75 " in this gun .
 
Hmmmm, I wonder if an un-reg'd version w/a long tube would do well in .25, at the same 45 fpe? how much did the pictured rig weigh? thanks again Linzie! too many rifles I want to build!! :)
 
Long tubes ate low pressure guns

YEMX said:
Hmmmm, I wonder if an un-reg'd version w/a long tube would do well in .25, at the same 45 fpe? how much did the pictured rig weigh? thanks again Linzie! too many rifles I want to build!! :)
Click to expand...

Hi again the long tube with a light custom BR plate was under 15 # . no the long tube will not be as good on shot count it will have a sweet fill pressure of between 1200 to 1500 psi depending on how it's tuned . In .22 a long tube at 38 fpe got 45 good shots that's why we went with HPA at 3000 psi and long bottle at 1250 regged pressure . Here's my blog I'll be posting updates and other airgun information . http://www.simplesite.com/Linzie

Linzie
 
I activate this thread again then I have a few questions about a custom barrel for BR.

1. Is there a best method of the three (cut, button and hammer forging), for making the rifling?
2. Length, is it best to stay with the length of the barrel as that who originally came with the rifle? Or can one safely try something a bit longer, say 550mm to 600mm instead of 500mm?
3. Twist rate, do you need different twist rates for different "power" of the rifle? I have one .177 at 16J and a .22 at 27J.
4. If not the same requirements, what is recommeded for a 16J and a 27J barrel? Both my current barrels are 500mm long.

Any information I've missed to ask about, just add it please.

I've found a guy in the UK who can provide BSA barrels. I think I'll start there.

EDIT. Forgot to mention that the caliber in question is .177 (4.5mm).
 
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How to figure out the required twist rate?

How does one go about figuring out the required/optimum twist rate for your application? There might be some forula?
 
A few theories are out there based on McCoy's testing. All attempt to predict a stability coefficient based on a number of factors. None of those factors fully takes into account the shape of our pellets, weights or subsonic velocities, however, some of the work on the rimfire side is helping to possibly answer some of these questions.

So far, we have seen records with typical twist rates, 1-16/17 and others not so typical, 1-24/36. This might indicate that at the current 25m distance, most pellets, at legal power velocities, are stable.
 
If we could get pellets that were sized optimally for current 22 lr bbls would this combo shoot as good as the current airgun standard ?
 
There are several barrel manufacturers that will produce a "tight bore" rimfire barrel. With a .215 bore and .218-.220 groove diameters, .22 caliber pellets are fully engraved and have shown to be excellent performers.
 
I have a couple of Benchmark bbls that are VERY draggy when slugging with pulled 22 lr bullets. I should push some 22 pellets down them. I don't have any match quality 22 pellets, probably only some Beeman Crow Magnums :)

I have a Suhl with a 19 twist bbl that is good for about 3 months of the summer and after that it's throwing flyers. I am going to rebbl the Suhl to make it sellable and wonder how that bbl would work for an airgun. I have a Daystate CRX that shoots amazingly well and would like to do a full custom build airgun. I have a lathe and milling machine, just need to start studying the available info.
 
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