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Marlin 336 accuracy inconsistencies #15563747 12/24/20
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warpig602 Offline OP
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I have one of my 336's in 35 Rem shooting .8 groups at 50 yards. When I back it up to 100 the groups open up to 4+ inches. Ive tightened down the barrel bands, used 2 different scopes/ring combos. This has happened with 2 different types of ammo(both sub moa at 50 yards) Holes appear to be round. What am I missing here? I half expected to double in group size, maybe a bit more but even the groups arent really groups. The only thing i can think of is maybe some imperfection in the crown that I cant see. I would imagine this would also cause my groups at 50 to be larger as well though, or at least inconsistent.

BP-B2

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15565310 12/24/20
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tikkanut Offline
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U using an official Lee factory crimp die ?

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15566127 12/24/20
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warpig602 Offline OP
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Was shooting factory ammo. 200gr Winchester, 200gr Hornady FTX

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15566182 12/24/20
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warpig602 Offline OP
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Was shooting factory ammo. 200gr Winchester, 200gr Hornady FTX

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15568118 12/25/20
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Angus1895 Offline
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Are they both boat tails?

I know the FTX are.


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IC-A

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15568187 12/25/20
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warpig602 Offline OP
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The Power Points are flat base

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15568431 12/25/20
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Bearcat74 Offline
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How long between shots?


I have a 30-30 that grouped ok at 50yds if you gave time between rounds. If you don’t fairly quickly groups opened up considerably. It never shot good at 100yds.

Here is how I fixed mine


I went back to the shop for disassembly and I knew when I had to take an acrylic mallet and knock the barrel bands off there would be problems.

I shot the rifle without the mag tube or bands and it shot great. I sanded a lot of wood off the forearm so that band would slip on vs hammer on. I gassed up the Dremel and cut a good amount of metal off the inside of the front band so again it would slide on vs hammer on. This actually got the mag tube off the barrel and created a small gap. I used some perma blue or something to reseal the metal.


Groups improved tremendously


When I die I hope I don't start voting democrat.
Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15569077 12/25/20
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warpig602 Offline OP
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I have a feeling it might be some odd barrel tension issue. On the bright side, I'm chopping it down to 16in and will not be using a front barrel band.

I wanted to shoot it first before dumping any money into it. I was really happy at 50 and of course expected bigger groups at 100. My next move was shoot without the mag tube attached. I have a slew of RPP parts coming so I may do this again when they get here. I just assumed there might be more to the extreme group size at 100 vs 50.....5-6in seems extreme.

I tightened up both barrel bands last week and tried again, though I noticed a big gap in the rear band where it wasnt making contact with the barrel. First 3 at 50 were .7, First 2 shots at 100 was .5.....3rd shot was 3in right of the first 2, fourth shot was 4in high of the first 2. At that point, I noticed the handguard had slipped forward some so I figured I'll wait for the RPP rail to show up and install that to at least rule out the rear barrel band being the issue which is what I suspect now.

Re: Marlin 336 accuracy inconsistencies [Re: Bearcat74] #15569371 12/25/20
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doctor_Encore Offline
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Originally Posted by Bearcat74

How long between shots?


I have a 30-30 that grouped ok at 50yds if you gave time between rounds. If you don’t fairly quickly groups opened up considerably. It never shot good at 100yds.

Here is how I fixed mine


I went back to the shop for disassembly and I knew when I had to take an acrylic mallet and knock the barrel bands off there would be problems.

I shot the rifle without the mag tube or bands and it shot great. I sanded a lot of wood off the forearm so that band would slip on vs hammer on. I gassed up the Dremel and cut a good amount of metal off the inside of the front band so again it would slide on vs hammer on. This actually got the mag tube off the barrel and created a small gap. I used some perma blue or something to reseal the metal.


Groups improved tremendously



Good advise here.

Re: Marlin 336 accuracy inconsistencies [Re: doctor_Encore] #15570281 12/26/20
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Mike_S Offline
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I have the same issue with a 30-30.

Originally Posted by doctor_Encore
Originally Posted by Bearcat74

How long between shots?


I have a 30-30 that grouped ok at 50yds if you gave time between rounds. If you don’t fairly quickly groups opened up considerably. It never shot good at 100yds.

Here is how I fixed mine


I went back to the shop for disassembly and I knew when I had to take an acrylic mallet and knock the barrel bands off there would be problems.

I shot the rifle without the mag tube or bands and it shot great. I sanded a lot of wood off the forearm so that band would slip on vs hammer on. I gassed up the Dremel and cut a good amount of metal off the inside of the front band so again it would slide on vs hammer on. This actually got the mag tube off the barrel and created a small gap. I used some perma blue or something to reseal the metal.


Groups improved tremendously



Good advise here.


Going to give this advice some consideration.

IC-B

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15572571 12/26/20
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doubleDs55 Offline
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I don't like the bands to be tight on any 336 except to be tight enough to stay on the mag tube but a bit loose on the barrel.
So i open up the band where it fits on the barrel to be a slip fit when tightened down.

The band on the stock I like it snug on the wood but a slip fit on the barrel, which means I also have to sand that part of the clamp out a bit.
Make sure the barrel and the end of the mag tube are not putting any pressure on each other. They should be separated by the barrel band.
If not the magazine tube is not coming out of the forearm straight and needs adjustment there to make sure it's straight with the barrel
all the way to the end.


I would have got him too but a Dad Blam snow flake hit me in da eye....
Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15624963 01/07/21
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warpig602 Offline OP
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Shot it today with nothing but the barrel.

Nice sub 1in group at 50....opened p to 3in+ at 100

Ive also notice the gun shoots extremely low and to the right. I ran out of adjustment on the VXII today. Ive tried 2 other scopes prior and always low and right. I started at 25 yards, gun was low right....brough it up and left. Moved it out 50.....rounds were low and right again. Moved out to 100....rounds were almost falling off the target so I had to choose a new aiming point to shoot the group.

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15649524 01/13/21
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doubleDs55 Offline
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Maybe try a heavy normal bullet and see what happens.
Slow it down some.


I would have got him too but a Dad Blam snow flake hit me in da eye....
Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15649761 01/13/21
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WStrayer Offline
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I would start with a really good barrel scrub. Use a good copper fouling sovent and even polishing compound on patches. I have also used the lead removal cloths with improvement. It is a several day process but once done, it is not hard to keep it that way.

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15680986 01/20/21
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Condition Yellow Offline
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This may be helpful to read:

Accurizing the Lever Gun

Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15683385 01/20/21
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reivertom Offline
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When I've had a problem like that, it has been because I rest the rifle in a different way and/or touch the barrel to the rest on a different place on the fore end, causing a different POI. I also have noticed that a hot barrel/receiver will start stringing the groups on certain lever rifles. I always sight in my hunting rifles of all types with a dead cold barrel......your first shot hunting is always a cold barrel.

Last edited by reivertom; 01/20/21.
Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15684260 01/20/21
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JohnnyLoco Offline
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Does it have a reduced power hammer spring, those low lock times mess up accuracy


"Come and sit by the fire, where good folk abound, so do the hypocrites and liars"
Re: Marlin 336 accuracy inconsistencies [Re: warpig602] #15684594 01/21/21
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Ghostman Offline
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Did you check the barrel crown?

Re: Marlin 336 accuracy inconsistencies [Re: reivertom] #15690520 01/22/21
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warpig602 Offline OP
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Originally Posted by reivertom
When I've had a problem like that, it has been because I rest the rifle in a different way and/or touch the barrel to the rest on a different place on the fore end, causing a different POI. I also have noticed that a hot barrel/receiver will start stringing the groups on certain lever rifles. I always sight in my hunting rifles of all types with a dead cold barrel......your first shot hunting is always a cold barrel.



Last time out with no mag tube, bands , sights or anything on the barrel i used receiver on the bag makin sure the barrel was 100% for all 6 shots. It was about as dead cold as I could get, was about 10 degrees pit with a light wind. 10min between the 3 shot groups.

Re: Marlin 336 accuracy inconsistencies [Re: JohnnyLoco] #15690522 01/22/21
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warpig602 Offline OP
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Originally Posted by JohnnyLoco
Does it have a reduced power hammer spring, those low lock times mess up accuracy


Negative

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