The "Ultimate" Crosman 1377: Where Should I Start?
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The "Ultimate" Crosman 1377: Where Should I Start?
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Topic: The "Ultimate" Crosman 1377: Where Should I Start? (Read 1791 times))
AirGunner1377
Shooter
Posts: 36
Real Name: Brandon
The "Ultimate" Crosman 1377: Where Should I Start?
«
on:
September 16, 2018, 04:38:16 PM »
Let me just say, I LOVE my Crosman 1377. I've used it quite a bit since I bought it in late 2011 from PyramydAir. But now I'm getting the urge to mod the heck out of it! Primarily for power, though I doubt the incredible accuracy of this thing would be degraded much. My overarching question is, where should I start?
First, do I have the "right" 1377? I've got the brass bolt handle/black trigger that I guess was typical at the time? Weird that it came in a box showing the brass trigger though. Wish I had that version as it's what I thought I'd get.
Now I understand that the 1377 has gone through many iterations. I can safely say that I'm not a fan of the older versions with the bolt on the rear. But do I even have the best 1377 to start modding? Or would that really matter? I happen to think the new version looks good, but I hear quality had went down quite a bit on the grips, and even potentially on the internals?
I guess the latter wouldn't matter much, since I'd be replacing all the major parts anyway...
Is there any possibility to hit 20+FPE? I'm looking to extend the barrel at least a few inches, put in a new bolt, obviously upgrade the piston and so on. But all of those lead to new questions. Is there any rule of thumb as to the FPS gained for each inch of additional barrel length without other mods? Likewise, I've heard that with piston upgrades, the gun will actually be weaker with 10 pumps, but merely that these upgrades will let you pump up a ton of times for a massive power increase. But suppose I wanted to increase power at 10 pumps. Would that be possible, maybe through a "smaller" piston that will build greater pressure with the same 10 pumps?
These are probably some dumb questions that I guess might be better experimented on with a chrony, but I'd rather have a better idea of what I'm getting into before I put a few hundred bucks into this thing, love it as I do.
Thanks so much for your guys' suggestions and any info you have to share!
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Davie, Florida, US
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AirGunner1377
Shooter
Posts: 36
Real Name: Brandon
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #1 on:
September 16, 2018, 04:47:57 PM »
Oh! Sorry to beat a dead horse, but suppose I wanted to convert to .22 caliber later on. Is it relatively "plug and play", where the .22 barrel simply has thinner walls to slot into the same platform as the .177, if that makes sense? Or are there other mods that would need to be made?
I know many use stock 1377's for critters, but I feel like if I wanted to, a .177 would provide a more humane kill through better penetration? On the other hand, I guess a .22 might provide better margin for error. Any thoughts on that? Sorry for all the questions.
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Davie, Florida, US
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Frankly
Plinker
Posts: 145
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Real Name: Frank Petronio
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #2 on:
September 16, 2018, 05:08:38 PM »
Frankly (!) unless you like the process I’d just wait for a heavily modified 1377 to come up for sale while continuing to enjoy your stock one. People sell them for pennies on the dollar, at least I did.
Personally I don’t care for the gun but there isn’t anything better on the market for the money. It’s hard to engineer a good high power hunting pistol, even more so at a reasonable cost. In this regard Crosman does better than Steyr ;-p
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Spencerport, NY
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Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #3 on:
September 16, 2018, 05:09:20 PM »
Welcome Brandon...
Although it really fun and rewarding to build one of these, you might want to price out all of the mods that you will want to do to get the gun where you want it. Then look at you options in other guns within that price, including the Crosman Custom Shop offerings.
Know one thing... you will NEVER get back out of a 1377 build what you put in it investment wise.
If you are comfortable with this then look at the flattop valve and piston setup first. Bare in mind, the more power you build, the more stress you put on other parts such as pivot areas.
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From deep within the Rabbit Hole, Alabama
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Gipper
Sharp Shooter
Posts: 519
Real Name: Brian
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #4 on:
September 17, 2018, 09:01:24 AM »
For more power an adjustable piston and flat top valve is the way to go. Mellon air is a good source for these and very reasonable but there are several sources for these parts as well. Some modding to the valve and transfer port is also going to help and is a great way to get your feet wet with modding. As far as conversion to .22 its simply a barrel
and
bolt swap. ENJOY the process of modding this little critter into the gun you want. Buying one that someone else has already done is not much fun and has no educational value at all. Getting back out what you put into it is subjective as the knowledge, experience and pride in accomplishment is something tangible to me and is retained even if/when you pass the gun along. Have fun with it!!
Brian
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Belleville, IL.
Curernt airgun fetish..Low serial numer RAW HM1000 - .22
Bentong
GTA Senior Contributor
Posts: 2592
Real Name: Leo
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #5 on:
September 17, 2018, 09:48:14 AM »
You can start here ↘️
https://www.gatewaytoairguns.org/GTA/index.php?topic=45838.0;topicseen
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B3c👀l Oragon
xtred1
Expert
Posts: 1227
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #6 on:
September 17, 2018, 09:06:49 PM »
Though I still have a stock power plant in mine, it did not take me long to have $350 into it. I would have saved money having the custom shop do the basics. I could have pretty much the same gun I have now without the TKO ldc for $150 from the custom shop. So adding the TKO from Mike I would be in around $200 on top of the custom shop gun saving $150 on my gun. Just a thought for you.
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maraudinglizard
If you are not living on the edge, you are taking up to much space.
GTA Senior Contributor
Posts: 5793
Real Name: Kris
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #7 on:
September 17, 2018, 09:40:33 PM »
I rebuilt my 30+ year old 1377 a while back and it was worth it to me. I just bought a 1300kt with the 18" barrel and will eventually mod it as well. It just depends on how much your wallet can stand.
https://www.gatewaytoairguns.org/GTA/index.php?topic=83670.msg802677#msg802677
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WyoMan
Sharp Shooter
Posts: 839
Real Name: Gary
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #8 on:
September 18, 2018, 12:20:21 AM »
If 20 fpe is your goal, and you want to stay in a pistol configuration, I'm sorry... don't see that happening. Of course there are extreme versions but they're not practical, imho. Practical meaning that you pump 10 or less times.
Even with the treadmill pumper crowd, 20 fpe is unlikely with the 13xx in .177 cal... even with a long barreled rifle configuration. But if you're going down the long barrel (rifle) road, you're better off with a 397...
https://www.crosman.com/airguns/air-rifles/benjamin-397
The 397 has a pump that is three times larger, and a longer lever (for better leverage). The small pump on the 13xx is very limited. There are things that can be done
but
, for a pistol, you can only do so much....
https://www.gatewaytoairguns.org/GTA/index.php?topic=123428.0
https://www.gatewaytoairguns.org/GTA/index.php?PHPSESSID=e954948fe94de2ab9cf24294ace04a00&topic=139287.0
https://www.gatewaytoairguns.org/GTA/index.php?topic=134186.0
https://www.gatewaytoairguns.org/GTA/index.php?topic=130503.0
https://www.gatewaytoairguns.org/GTA/index.php?topic=128347.0
https://www.gatewaytoairguns.org/GTA/index.php?topic=129229.0
Wyo
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Wyoming
AirGunner1377
Shooter
Posts: 36
Real Name: Brandon
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #9 on:
September 20, 2018, 05:24:33 AM »
Upon looking at the Crosman Custom Shop, I think that may be my first starting point to acquire many of the mods I want for what seems to be a really reasonable price.
Also, I might be crazy, but does it seem as though the pump .22's retain quite a bit more velocity as compared to .177 when looking at pellet weight?
For example, seems like a typical 1377 with 10 pumps will do almost 500fps. On the other hand, a 1322 will do about 450. Keeping in mind that .22 pellets weigh about twice as much, that's almost double the energy simply by going with the .22 caliber version. With that in mind, I'm now thinking that going with .22 is a no-brainer in this situation.
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Davie, Florida, US
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AirGunner1377
Shooter
Posts: 36
Real Name: Brandon
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #10 on:
September 20, 2018, 05:25:51 AM »
Oh, and probably a silly question, but is there anything inherently different about the 1300KT from the custom shop compared to the 1377/22? Or is that basically just Crosman's designation for these guns when they ship with a steel breech?
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Davie, Florida, US
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WyoMan
Sharp Shooter
Posts: 839
Real Name: Gary
Re: The "Ultimate" Crosman 1377: Where Should I Start?
«
Reply #11 on:
September 20, 2018, 09:56:16 PM »
Hi Brandon, you're not crazy about the velocity comparison between the .22 and .177. There are three things going on...
First, for barrels of the same length, the .22 has 54% more barrel volume for the pressurized charge to expand into... this is the primary reason that the larger calibers deliver more fpe.
Secondly, the heavier pellet allows more of the pressurized energy to be transferred into the pellet (more kinetic energy into the pellet instead of kinetic energy into the expanding gas/air charge), because it's moving slower.
And lastly, since the output of the guns is really fpe (not velocity), and the fpe is a product of... (mass x velocity^2), velocity differences are less than their respective differences in fpe. Hope some of that made sense... I only proofread it once
Can't help with the custom shop 1300KT... have ten 13xx but none from the custom shop -
Wyo
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Wyoming
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The "Ultimate" Crosman 1377: Where Should I Start?