Maximus upgrades

[Horatio]

Problem with an extended probe, is that it is almost impossible to load a full size pellet. Especially in the dark when pasting.

Top Compound the issue, the extended probe will be over the port when firing. Grrrrr!!!  But the loading issues, with the tiny loading port is the biggest issue. The bolt does not retract as far as a Disco bolt. PITA!!!

The BNM Breech cured that problem!

Knife

Can a little bit be taken off the back of the bolt. What acts as the rearward stop?

[KnifeMaker]

Yes, just be careful to see how much room there is between the bolt handle shaft, and the rear of the slot. Measure it and go no more than two thirds of the distance to ensure full cocking.

Did exactly this to mine before installing the BNM Breech.  Made it much easier to load in the dark. Thought about milling the opening of the breach wider, but the BNM took care of the issue for me.

Knife

[bowdoc64]

Problem with an extended probe, is that it is almost impossible to load a full size pellet. Especially in the dark when pasting.

Top Compound the issue, the extended probe will be over the port when firing. Grrrrr!!!  But the loading issues, with the tiny loading port is the biggest issue. The bolt does not retract as far as a Disco bolt. PITA!!!

The BNM Breech cured that problem!

Knife

Can a little bit be taken off the back of the bolt. What acts as the rearward stop?

I think the hammer determines how far the bolt goes back but I could be wrong. How about leaving the bolt stock and making a pellet seating tool to push the pellet past the port. I know seating tool are used on beak barrels and it helps with accuracy. When I get my chrony I am going to play with that theory

[KnifeMaker]

Removing part of the rear of the bolt is for giving more room to insert a pellet. It doesn't have anything to do with how far the pellet is pushed into the breach. Just makes loading pellets easier. Especially in the dark. 

The breach opening is tiny on this platform. Adding to the problem, is the bolt probe uses up about half of the already small amount of room. Heavier (Longer) pellets are even harder to insert. Again, especially in a hurried condition in the dark. Allowing the bolt to be retracted further to the rear, is a real help here.

Knife

[longhunter]

Who makes a good extended bolt probe for the Maximus

David at ALCHEMY AIRWERKS. He's really good to do business with.

[bowdoc64]

Who makes a good extended bolt probe for the Maximus

David at ALCHEMY AIRWERKS. He's really good to do business with.

I got my larger transfer port from them. I think I'm really going to play with making a pellet seating tool when I get my chrony. I think that would be the be the best of both worlds

[Hoosier Daddy]

Warning: this topic has not been posted in for at least 120 days.
Unless you're sure you want to reply, please consider starting a new topic.

Yes, Yes... I know... old thread.
But I am about to revisit my Maxi and wanted to bump this back up instead of starting a new thread and re-hashing or worse yet, loosing some of this fine info.

Put together a little shopping list from Magnum Airpower and would like some input before spending the money, here is what I have so far....

CUSTOM BRASS RIFLE TRIGGER - $35.00
MAGNUM RIFLE POWER ADJUSTER, COMPACT - $30
MAXIMUS BARREL BAND - $8.00
MAGNUM HAMMER SPRING .045 - $5.30
MAGNUM HAMMER SPRING .042 - $5.30

Reason for the barrel band is I have read of improvements by adding a second one and tuning the harmonics.
The two different hammer springs are to try and tune for use with the power adjuster, all in an attempt to lower the cocking effort yet improve the shot string.

The cocking force with the OEM spring is quite high. Get a 0.042"x 1.5" heavy P-rod spring from Hill Airguns. It lowers the cocking force, increases shot count and still keeps the velocity up over 900 fps.

The cocking force of this Maxi is my biggest turn-off. No wonder they had have a reputation for bolt handle failures. 
 I do NOT pump it past the 2000 psi factory spec, so would the .045 be even worth trying?
 Currently mine is shooting well (accurate) from 1750 down to about 1300 psi. When I am bench shooting, it's teathered to a Paintball bottle with a ExpertHPA reg set at 1600.


Here is my best 35 yard group with that set-up shooting JSB 18g.

[Back_Roads]

 I had recently searched for info on  this also. From what I gathered the .045 spring is only needed if one installs the screws to allow more PSI in the tube.

[Hoosier Daddy]

That is my thought too James.
 Unless someone knows right off hand what the OEM spring is, I will measure mine while it is apart.
It just dawned on me, I will be putting a extended probe in my 1740 project that has it's original 2240 hammer spring. I will measure it while I am there as well.

[rong1966]

I think that the OEM spring is .045.

[bowdoc64]

Warning: this topic has not been posted in for at least 120 days.
Unless you're sure you want to reply, please consider starting a new topic.

Yes, Yes... I know... old thread.
But I am about to revisit my Maxi and wanted to bump this back up instead of starting a new thread and re-hashing or worse yet, loosing some of this fine info.

Put together a little shopping list from Magnum Airpower and would like some input before spending the money, here is what I have so far....

CUSTOM BRASS RIFLE TRIGGER - $35.00
MAGNUM RIFLE POWER ADJUSTER, COMPACT - $30
MAXIMUS BARREL BAND - $8.00
MAGNUM HAMMER SPRING .045 - $5.30
MAGNUM HAMMER SPRING .042 - $5.30

Reason for the barrel band is I have read of improvements by adding a second one and tuning the harmonics.
The two different hammer springs are to try and tune for use with the power adjuster, all in an attempt to lower the cocking effort yet improve the shot string.

The cocking force with the OEM spring is quite high. Get a 0.042"x 1.5" heavy P-rod spring from Hill Airguns. It lowers the cocking force, increases shot count and still keeps the velocity up over 900 fps.

The cocking force of this Maxi is my biggest turn-off. No wonder they had have a reputation for bolt handle failures. 
 I do NOT pump it past the 2000 psi factory spec, so would the .045 be even worth trying?
 Currently mine is shooting well (accurate) from 1750 down to about 1300 psi. When I am bench shooting, it's teathered to a Paintball bottle with a ExpertHPA reg set at 1600.


Here is my best 35 yard group with that set-up shooting JSB 18g.

Great group

[Hoosier Daddy]

"Fluke"
 
HAHAHHA!

I had a video of hitting a 2 ltr pop bottle at 100 yards but it was sketchy and gone.

Now the underlying purpose of resurrecting this thread... day after tomorrow, I will receive a Boyd's Evolution stock I ordered for the Maxi.
So the next phase begins....

[bowdoc64]

Warning: this topic has not been posted in for at least 120 days.
Unless you're sure you want to reply, please consider starting a new topic.

Yes, Yes... I know... old thread.
But I am about to revisit my Maxi and wanted to bump this back up instead of starting a new thread and re-hashing or worse yet, loosing some of this fine info.

Put together a little shopping list from Magnum Airpower and would like some input before spending the money, here is what I have so far....

CUSTOM BRASS RIFLE TRIGGER - $35.00
MAGNUM RIFLE POWER ADJUSTER, COMPACT - $30
MAXIMUS BARREL BAND - $8.00
MAGNUM HAMMER SPRING .045 - $5.30
MAGNUM HAMMER SPRING .042 - $5.30

Reason for the barrel band is I have read of improvements by adding a second one and tuning the harmonics.
The two different hammer springs are to try and tune for use with the power adjuster, all in an attempt to lower the cocking effort yet improve the shot string.

The cocking force with the OEM spring is quite high. Get a 0.042"x 1.5" heavy P-rod spring from Hill Airguns. It lowers the cocking force, increases shot count and still keeps the velocity up over 900 fps.

The cocking force of this Maxi is my biggest turn-off. No wonder they had have a reputation for bolt handle failures. 
 I do NOT pump it past the 2000 psi factory spec, so would the .045 be even worth trying?
 Currently mine is shooting well (accurate) from 1750 down to about 1300 psi. When I am bench shooting, it's teathered to a Paintball bottle with a ExpertHPA reg set at 1600.


Here is my best 35 yard group with that set-up shooting JSB 18g.

The magnum ..045 wire spring is a little stiffer then the stock spring but to me it cocks easier with the magnum spring. I think because the coils are not as tight as the stock spring. I like my compact adjuster. I would back it out about a 1/2 inch to start and go from there.

[caveman]

I would love to see one of their stocks, been thinking bout one of those for a long time. What colors did you get? What was the cost out the door if you don't mind me asking. Thanx

[Hoosier Daddy]

Thanks bowdoc, that helps me a bit.


caveman
I got the Forest Camo Laminate.
It would have been $137, but I added stippling Lasered to the palm swell and forearm, a $55 option. 
With shipping took it just north of $200

[Horatio]

I've always had a thing for laminated stocks. Never owned one though.

[bowdoc64]

Warning: this topic has not been posted in for at least 120 days.
Unless you're sure you want to reply, please consider starting a new topic.

Yes, Yes... I know... old thread.
But I am about to revisit my Maxi and wanted to bump this back up instead of starting a new thread and re-hashing or worse yet, loosing some of this fine info.

Put together a little shopping list from Magnum Airpower and would like some input before spending the money, here is what I have so far....

CUSTOM BRASS RIFLE TRIGGER - $35.00
MAGNUM RIFLE POWER ADJUSTER, COMPACT - $30
MAXIMUS BARREL BAND - $8.00
MAGNUM HAMMER SPRING .045 - $5.30
MAGNUM HAMMER SPRING .042 - $5.30

Reason for the barrel band is I have read of improvements by adding a second one and tuning the harmonics.
The two different hammer springs are to try and tune for use with the power adjuster, all in an attempt to lower the cocking effort yet improve the shot string.

The cocking force with the OEM spring is quite high. Get a 0.042"x 1.5" heavy P-rod spring from Hill Airguns. It lowers the cocking force, increases shot count and still keeps the velocity up over 900 fps.

The cocking force of this Maxi is my biggest turn-off. No wonder they had have a reputation for bolt handle failures. 
 I do NOT pump it past the 2000 psi factory spec, so would the .045 be even worth trying?
 Currently mine is shooting well (accurate) from 1750 down to about 1300 psi. When I am bench shooting, it's teathered to a Paintball bottle with a ExpertHPA reg set at 1600.


Here is my best 35 yard group with that set-up shooting JSB 18g.

Great group

My recent 30 yard 10 shot group with hn extreme hunters and two 5 shot groups with ultra shocks and hn hunters

[bowdoc64]

Better view of my last 30 yard group's

[Hoosier Daddy]

Very nice groups yourself Drew!
 The stock arrived Tuesday from Boyds and it test fit a little loose.
Last night I took it back off and put some felt side of Velcro in the bedding along the sides.
While I had it apart I played with the two screw mod and bent the hair pin a little between my fingers.
Took some time to adjust between the spring too light / stiff and the safety would fall out, or the screws wouldn't let the safety engauge or the gun not fire. After about 4 tries I got the trigger just right.
 Swapped some scopes around and wound up putting the BSA Catseye on it.

I need to upload last nights photo's but here is a teaser from when the stock arrive the night before...

[bowdoc64]

Gorgeous stock. Yeah that hair pin spring is Ricky. Fine line between stiff and to loose.