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Without reading anything but the original post ; I do own one and have owned and shot several thru the years and can truthfully say I have never known one to be hard to get good groups with at or under 50 yards. I cast my .350 balls in dead soft lead in either a Lyman 2 cavity or an old Lee 6 cavity .350 mold . I use between 25 and 40 grains of FFFG in either Goex , Schuetzen , or some of my hoarded Dupont. At 25 yards all shots will stay on a quarter on a bad day and a dime on a good one . Patches are .018 and I use bear oil for hunting and as often as not spit patch for target , strip cut on the muzzle . My current Seneca came as a .36 and I have added a factory .45 barrel . It shoots pretty close to the same with the .45 barrel using Lyman 440 balls , same patch and 50 grains of Dupont FFg .
 
Maybe someone changed out the barrel for one with a fast twist ? That could be why it is not Seneca marked . Is the Thompson Center mark present on the barrel ? Never known a factory Seneca that would not shoot round balls let alone one that would only shoot conical bullets. Glad you got it shooting and are enjoying it to the fullest , them goats sure look tasty .
 
I'd say its an original barrel
 

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And did the hammer blowback problem disappear? Glad it’s working for you now ! Greg
Ok,so I did take note of the fact that the hammer had set back to half **** after shooting the fox. Seeing as half **** is only about 5mm from fully fired position,its not something I readily notice. However, I'm beginning to think that just maybe the hammer spring is a little weak,as there's been a few times now that the gun has misfired but fired with a recock. Mind you,thats with the new nipples too,so they may be slightly oversized as well.
 
Are your caps seating all the way on the new nipples ? If not you can chuck them up in a drill and dress them off just enough to allow them to seat but still be tight . I doubt the main spring is weak.
 
Are your caps seating all the way on the new nipples ? If not you can chuck them up in a drill and dress them off just enough to allow them to seat but still be tight . I doubt the main spring is weak.
You say you doubt its the mainspring,well,I just fired an RWS cap off,nothing else,and THAT set it to half ****.....
 
See if "The Gun Works" has any springs.

Another place to look for a spring is:

Classic Fire Arms & Parts
 
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You say you doubt its the mainspring,well,I just fired an RWS cap off,nothing else,and THAT set it to half ****.....

Has someone clipped some coils off the spring maybe ? Seems replacing the nipple did not affect the self cocking . My son had a TC that would fire intermittently leaving the hammer on the safety notch . Like to drove me crazy till I checked the one thing that should have been the first thing I checked . It was a just barely loose screw in the lock, one was tight but one was seated but not tight . I have owned a lot of TC rifles and still own 5 that I can think of right off , all have had the snot shot out of them and none has ever developed a weak spring . I have seen 1 that broke and gave issues and a couple that had been clipped to lighten them that gave trouble .
 
Has someone clipped some coils off the spring maybe ? Seems replacing the nipple did not affect the self cocking . My son had a TC that would fire intermittently leaving the hammer on the safety notch . Like to drove me crazy till I checked the one thing that should have been the first thing I checked . It was a just barely loose screw in the lock, one was tight but one was seated but not tight . I have owned a lot of TC rifles and still own 5 that I can think of right off , all have had the snot shot out of them and none has ever developed a weak spring . I have seen 1 that broke and gave issues and a couple that had been clipped to lighten them that gave trouble .
It doesn't appear to be clipped. I'm actually not too terribly worried about it,I tested 4 RWS caps yesterday with zero misfires so I think the misfire problem is more to do with either the CCI caps or nipple size or a combination of both. And it didn't set to half **** every time either.
 
Yep, did not think of that. Might take the spring to a good machine parts place to see if they have one with a little more zest.
 
Well she keeps racking up game ! Another bunny for the freezer !
 

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You are closing in on Britsmoothy
I'm on holidays at the moment so I'm hunting a fair bit lol. And I still use regular firearms a bit,mostly at work,so I probably have caught him and passed him just not with a muzzleloader 😅😅
 
Weeeeelllll....just ran into a problem....ran out of powder with a goat hunt on tomorrow.....🙄🤣
 
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