I installed every piece of the slug kit on my M3. I currently have a 600mm (upgrading to the 700mm as soon as it's delivered) and I have gotten 1000fps out of the 600mm with all pieces installed.
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Tuning Impact M3 700 mm sniper: very very low slug velocity.
- Thread starter MajorSylvester
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Is it possibly you put the hammer in backwards?? I know it sounds silly, but I mistakenly did this at first and it shot terribly. I realized I put it in backwards, flipped around and it worked perfectly. Rookie mistake =)
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Thanks Kevin, did you manage to get 1000 fps with a 34gr?
Hammer in backward could be a good explanation for such a lack of performance with my rifle and I hopped it woul be the case but no, I double checked this time and again, the hammer is set properly.
Hammer in backward could be a good explanation for such a lack of performance with my rifle and I hopped it woul be the case but no, I double checked this time and again, the hammer is set properly.
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Gonna be a silly question but have you tried it with your factory pellet probe again? Have your checked the breech oring?
Butch
Butch
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Seeing this post from Butch made me look at my FX slug probe. There is a small o-ring that seals the pin probe to the body.
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Butch, Sniper 701, good ideas, I'm on a business trip right now but I will check the pin probes and check to O ring tonight and let you know.
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Back home, wife is not back from work yet so I have some free time to shoot a couple of slugs in my Parisian condominium without generating a third world war. As suggested I replaced the slug power kit pin proble with the original and...
... It worked!!!
The 34 grains speed reached 996 fps and S/D was 4. I removed the original probe and re installed the pin probe from the slug power kit and it worked also: the velocity was about the same. Why did it worked now and the very same configuration generated only 700 fps at the range? I have no clue. And no, it is not a question of speedometer bad installation: all my velocities where measured with the FX radar and the Magnetospeed and the 2 set of measurement were consistant. The most probable explanation is that all the creative swears I shouted during the last 72 hours war interpreted as a prayer by Eole, the god of airgunners. Or maybe the fact of installing and re-intalling the probes did fix an O ring right somewhere. Who knows?
Thanks to all of you for helping me returning to the community of happy M3 users.
Pascal
... It worked!!!
The 34 grains speed reached 996 fps and S/D was 4. I removed the original probe and re installed the pin probe from the slug power kit and it worked also: the velocity was about the same. Why did it worked now and the very same configuration generated only 700 fps at the range? I have no clue. And no, it is not a question of speedometer bad installation: all my velocities where measured with the FX radar and the Magnetospeed and the 2 set of measurement were consistant. The most probable explanation is that all the creative swears I shouted during the last 72 hours war interpreted as a prayer by Eole, the god of airgunners. Or maybe the fact of installing and re-intalling the probes did fix an O ring right somewhere. Who knows?
Thanks to all of you for helping me returning to the community of happy M3 users.
Pascal
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I noticed the plenum is a bit offset vs the breach, see picture below, do you have the same offset in your M3 and could it have an influence on the massive velocity decrease of my M3 
rifle?
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