Crosman 1377 Modding

[rapidboy1]

What does a flat top piston do?
It's running as high as I want it to run power-wise with the standard set-up.

Saves a bit of pumping, 6 pumps with FTP is supposed to be the same as 10 pumps with the regular set up.

[Biker_Bob]

Saves a bit of pumping, 6 pumps with FTP is supposed to be the same as 10 pumps with the regular set up.

OK, but what happens if you put 10 pumps in with FTP?

[rapidboy1]

Depends on how you set it up

[Adam77K]

I have an FTP in mine. Had to cut the hammer spring right down to keep it from over.

[Biker_Bob]

Right, I'll be giving that one a miss then.
With the extended pump handle it's so easy to pump anyway.

[Adam77K]

Right, I'll be giving that one a miss then.
With the extended pump handle it's so easy to pump anyway.

I agree it's not necessary if the rest is optimised. I got it as I was having trouble getting mine over 3 ft.lbs with 10 pumps. Turned out the 2 main issues were the hole in the back of the valve plus the restricted port.

[Biker_Bob]

I agree it's not necessary if the rest is optimised. I got it as I was having trouble getting mine over 3 ft.lbs with 10 pumps. Turned out the 2 main issues were the hole in the back of the valve plus the restricted port.

Did you see that old thread I did about that bleed hole in the valve?

[TonyL]

What pellets do most use for the 1377 for accuracy?

I see Bob had tested with JSB 8.44.

My "mini-carbine" one, a Mk III with shoulder stock, Crosman steel breech and 4x32 scope is lazer-accurate (at garden ranges, at least) with the RWS Hobby.

My totally standard later one (later valve, lower power) had been delivering poor results with some RWS Geco that I was given when I bought my .177 HW45 last Autumn. A little bit of a session yesterday revealed the Hobby as better but the Superdome as better still. Very pleasing 10 shot group at about nine yards apart from one errant one which will have been pilot error!

I'll give it a go with some JSB 8.44 and 7.87 when I get the chance. Plus some H&N FTT and Baracuda FT to see if any of these fare even better than the 'Domes. Satisfactory performance with more cost-effective pellets would please me and would be more in keeping with the nature of the pistol. Shame it doesn't seem to like the Geco!

[Biker_Bob]

The JSBs work well for me, although they are getting very expensive.
Maybe I'll investigate some others and report back, I've always started with Superdomes when I get a new gun as more often than not they work just fine but on this occasion I had some JSBs so I've stuck with them.
The new Wasps look OK.

Maybe time to try lead free, get ahead of the curve?

[Adam77K]

The barrels are variable. Mine is really good with JSBs, Hobbies, R10s, but the one I bought initially that I returned due to low power (before realising they were all like that) wasn't as good. Also had a 2250 that was shockingly bad - shotgun at 10m bad.

[TonyL]

Yes, I understand that to be the case, Adam, and seeing some of that here. Thank you.

[TonyL]

The JSBs work well for me, although they are getting very expensive.
Maybe I'll investigate some others and report back, I've always started with Superdomes when I get a new gun as more often than not they work just fine but on this occasion I had some JSBs so I've stuck with them.
The new Wasps look OK.

Maybe time to try lead free, get ahead of the curve?

Thank you for that.

One thing I'll definitely not be doing, especially in the short term, is trying the lead-free stuff down my guns. And especially at those prices and in guns for plinking duties.

I'll give some of my other pellets a try as mentioned. Also, when switching pellets, I usually allow a good 20 or 30 conditioning ones before accuracy testing. Due to time constraints I didn't do that this time. So I'm guessing another 15 or 20 'Domes through it and then try for some serious groups might yield even more pleasing results?