Recovery time on the QB 78 is relatively short , as it has a large valve made of brass and aluminum and a fairly large tube .
I use 30 seconds between shots on a test string , so the testing can be standardised ..the shots are usually very consistant .
I take the average of the first 10 shots , and useing 80% of that velocity
would give me the number of useable shots .
Frank
QB-78 tuned for basement shooting???
Hi Frank,
Hey, that's good news about the QB being consistant with only 30 seconds between shots. The QB-78 design (Cr160) seems to be a good one and that's obviously why it's so popular ... and why Mac-1 made the effort to bring the Cr160 design back to life via China. Do you use powerlets or bulk in your QB... or both?
I'm sure you know this already but the Airgun Digest (3rd Edition) reviews the QB rifle.
Hi Sniper,
Yah, hammers usually need to be cocked when filling guns with light valve springs. Hmmm... the second problem you experienced would have to be tinkered with to find the best spring weight.
Thanks guys,
Todd
Hey, that's good news about the QB being consistant with only 30 seconds between shots. The QB-78 design (Cr160) seems to be a good one and that's obviously why it's so popular ... and why Mac-1 made the effort to bring the Cr160 design back to life via China. Do you use powerlets or bulk in your QB... or both?
I'm sure you know this already but the Airgun Digest (3rd Edition) reviews the QB rifle.
Hi Sniper,
Yah, hammers usually need to be cocked when filling guns with light valve springs. Hmmm... the second problem you experienced would have to be tinkered with to find the best spring weight.
Thanks guys,
Todd
Yes, that's true, I wish I got something to measure the weight of the spring tension.TCooper wrote:Hi Sniper,
Yah, hammers usually need to be cocked when filling guns with light valve springs. Hmmm... the second problem you experienced would have to be tinkered with to find the best spring weight.
Thanks guys,
Todd
Any idea ??? this would bring a break thru of the evolution of modding ...
I was thinking to use something like a scale for trigger pull. As at CT
they have digital scale for weighing fish at fishing department.
Hi Todd ,
The Cr 160 design is certainly a good one , one the chinese
(and Tim Macmurry) liked .I use powerlets , I have the Xisico bulk caps , and I think they are well made ..but have yet to try them .
I am amazed by all the designs Crosman had patents on in the past and have discontinued , maybe Crosman could get the chinese to revive the Cr 600 and the Cr 400 !! well we can dream .
Frank
The Cr 160 design is certainly a good one , one the chinese
(and Tim Macmurry) liked .I use powerlets , I have the Xisico bulk caps , and I think they are well made ..but have yet to try them .
I am amazed by all the designs Crosman had patents on in the past and have discontinued , maybe Crosman could get the chinese to revive the Cr 600 and the Cr 400 !! well we can dream .
Frank
Yes, you're absolutely right, I was wondering about the same thingairbuddy3 wrote:Hi Todd ,
The Cr 160 design is certainly a good one , one the chinese
(and Tim Macmurry) liked .I use powerlets , I have the Xisico bulk caps , and I think they are well made ..but have yet to try them .
I am amazed by all the designs Crosman had patents on in the past and have discontinued , maybe Crosman could get the chinese to revive the Cr 600 and the Cr 400 !! well we can dream .
Frank
since now I got all that you mentioned and not to forget the CR 622
which is my favourite as well and the CR 99, I love the sound of CR 99,
it's totally different than all the co2, I know.
I have a couple CR 160 in mind, perhaps soon in the new year. There is
one a very interesting edition, it's the Ted William Edition CR 160 original.
That's totally collector item.
I just re-read the "Sportsman Model QB22 Rifle" test report in the Airgun Digest. Hmmm... not too detailed but better than nothing.
Details
-The article starts with a hunting story with the old Cr160... blah, blah, blah...
-Then the production facts are mentioned. Good details. The old Cr160 was discontinued in 1970. The Sportsman QB77 was unveiled at the 1992 ShotShow (.177 version - CR167 copy). The QB22 version arrived a year later.
-Tim McMurray (Mac-1) was the initiator of the reproduction project. Henry Harn was Tim's collaborator, a Chinese engineer in the L.A. area. Together they "reverse engineered" the Cr160.
-blah, blah, blah ... rifle measurements and features.
-shot count mentioned at 40-50 usable shots per two powerlets (QB77 and QB22)
-QB22 was about 3 to 4 FPE more than QB77
-14-15gr pellets gave 11.5-12.5FPE for first 25 shots with QB22
-21 grain Kodiak pellets gave 13.25FPE
-The model Cr160 was originally developed for the NRA's 25-foot marksmanship training program
-The 160 was found to be very accurate for field use
-The new QB22 was found to be extremely ammo tolerant, grouping remarkable well with a wide range of pellet brands
-At 10m the 13.9gr RWS wadcutter grouped .40"ctc for 5 shots, and at 30 yards it would group just over 1"ctc
-The round head pellets dominated long range accuracy
-Round head pellet groupings were 1" to 1.5" ctc at 30 yards with windy conditions
-Author recommended Crosman domes, Marksman FTS, RWS Superdome, Eley Wasp, Beeman Kodiak
My comments - The original QB rifles were known as the QB77(.177) and QB22(.22). Tim Mac (in California) assembled these imported Chinese rifles and took careful steps during assembly to ensure quality. The Chinese plant then started selling the QB-78 model, by-passing Tim. The QB-78s are not as carefully assembled as the QB-77 and QB-22 but a little bit of labour makes them wonderful. These facts were posted in the past, on another forum, by Tim.
Tim's QB rifles were tuned to higher velocity than the current QB-78 rifles. He also replaced the seals with upgrades, checked muzzle crowns, etc. Too bad Tim doesn't sell the QBs anymore.
Todd
Details
-The article starts with a hunting story with the old Cr160... blah, blah, blah...
-Then the production facts are mentioned. Good details. The old Cr160 was discontinued in 1970. The Sportsman QB77 was unveiled at the 1992 ShotShow (.177 version - CR167 copy). The QB22 version arrived a year later.
-Tim McMurray (Mac-1) was the initiator of the reproduction project. Henry Harn was Tim's collaborator, a Chinese engineer in the L.A. area. Together they "reverse engineered" the Cr160.
-blah, blah, blah ... rifle measurements and features.
-shot count mentioned at 40-50 usable shots per two powerlets (QB77 and QB22)
-QB22 was about 3 to 4 FPE more than QB77
-14-15gr pellets gave 11.5-12.5FPE for first 25 shots with QB22
-21 grain Kodiak pellets gave 13.25FPE
-The model Cr160 was originally developed for the NRA's 25-foot marksmanship training program
-The 160 was found to be very accurate for field use
-The new QB22 was found to be extremely ammo tolerant, grouping remarkable well with a wide range of pellet brands
-At 10m the 13.9gr RWS wadcutter grouped .40"ctc for 5 shots, and at 30 yards it would group just over 1"ctc
-The round head pellets dominated long range accuracy
-Round head pellet groupings were 1" to 1.5" ctc at 30 yards with windy conditions
-Author recommended Crosman domes, Marksman FTS, RWS Superdome, Eley Wasp, Beeman Kodiak
My comments - The original QB rifles were known as the QB77(.177) and QB22(.22). Tim Mac (in California) assembled these imported Chinese rifles and took careful steps during assembly to ensure quality. The Chinese plant then started selling the QB-78 model, by-passing Tim. The QB-78s are not as carefully assembled as the QB-77 and QB-22 but a little bit of labour makes them wonderful. These facts were posted in the past, on another forum, by Tim.
Tim's QB rifles were tuned to higher velocity than the current QB-78 rifles. He also replaced the seals with upgrades, checked muzzle crowns, etc. Too bad Tim doesn't sell the QBs anymore.
Todd
Sniper , where do you find a 160 Ted Williams in Canada...?
Or are you going to fax a copy of your PAL south of the 49th parallel and
Go through the paperwork and wait to get it from the US.
A lot of the Heritage Crosman airguns have gone south of the 49th ...because of all the hassles associated with selling them in Canada.
Includeing some rare guns made in Canada..right here in Ontario.
Frank
Or are you going to fax a copy of your PAL south of the 49th parallel and
Go through the paperwork and wait to get it from the US.
A lot of the Heritage Crosman airguns have gone south of the 49th ...because of all the hassles associated with selling them in Canada.
Includeing some rare guns made in Canada..right here in Ontario.
Frank
Hi Frank,airbuddy3 wrote:Sniper , where do you find a 160 Ted Williams in Canada...?
Or are you going to fax a copy of your PAL south of the 49th parallel and
Go through the paperwork and wait to get it from the US.
A lot of the Heritage Crosman airguns have gone south of the 49th ...because of all the hassles associated with selling them in Canada.
Includeing some rare guns made in Canada..right here in Ontario.
Frank
Not a chance I would try to bring in any gun from U.S. , I really don't need the hassle from custom,
I know some people here have successfully done the transaction from US to Canada.
May be some parts and that's about it.
D&L has reserved some CR 160 for me. Ted Williams version is probably
one of the most expensive of CR 160. In excellent condition should be in
500 range.