Interesting 44 mag groups

[BBerguson]

Bullets are from an old Lee 240 gr mold with gas check.

5 shot groups with bullet sized to .430 were about 2 inches or so.

5 shot groups with bullets sized to .432 were the same except for one flyer in each group. One was about 5 inches higher, the other one didn’t hit the paper. Couldn’t figure out the flyers that wide of the group until I was talking to my son about it. Gas check is getting stripped off. Sizing to .432 isn’t crimping them on very hard and squeezing them into the rifling another 2 thousandths must be stripping them.

That’s the only thing I can thing of anyways. Anybody ever see this before?

 

[JustJim]

Similar: 2 groups on the target, no consistency in the number of shots in each. Attributed it to the same cause when epoxied-on GCs all hit in one spot. In that gun (S&W's first "Mountain Gun") it was worth doing. Polished out the GC shank in the single-cavity mould and got away from the epoxy.

Like an idiot, I traded off the gun (for what I can't even remember). If I ever find another--and it shoots as well--I'm going to take my jack knife and scratch my name on the side so no one else wants it.

 

[castmiester]

Bullets are from an old Lee 240 gr mold with gas check.

5 shot groups with bullet sized to .430 were about 2 inches or so.

5 shot groups with bullets sized to .432 were the same except for one flyer in each group. One was about 5 inches higher, the other one didn’t hit the paper. Couldn’t figure out the flyers that wide of the group until I was talking to my son about it. Gas check is getting stripped off. Sizing to .432 isn’t crimping them on very hard and squeezing them into the rifling another 2 thousandths must be stripping them.

That’s the only thing I can thing of anyways. Anybody ever see this before?

Did you pin gauge your cylinder throats ?

 

[RBHarter]

My Ruger would put pairs on paper. 4 in a group about 3" at 25 but obviously 2 pair ,1 about 2" out and one all alone about 8" beyond the loaner . With the throats now all .4535-.4545 If I'm hot on it'll do 5 in 4.5" at 50yd leaning Weaver . They started out 2ea .4525 , .4530 , 1 ea .4538 ,and .4545.
It doesn't shoot jackets well now with a flier but I'm happy enough with it in cast .

 

[BBerguson]

I should have said what I was shooting…. CVA Scout single shot rifle.

I bought some chamber casting metal almost 3 years ago but got really sick (for 3 months) a week after I got it. I bought it for this rifle but haven‘t used it yet. I don’t need to size to .432 because .430’s are working fine and I’ve never had a bullet tumbling out of it. Just trying things to see if it made a difference. Well it did but not in the way I was thinking it would! I sized the rest of the .432’s to .430 and will move on.

 

[castmiester]

I should have said what I was shooting…. CVA Scout single shot rifle.

I bought some chamber casting metal almost 3 years ago but got really sick (for 3 months) a week after I got it. I bought it for this rifle but haven‘t used it yet. I don’t need to size to .432 because .430’s are working fine and I’ve never had a bullet tumbling out of it. Just trying things to see if it made a difference. Well it did but not in the way I was thinking it would! I sized the rest of the .432’s to .430 and will move on.

what's your groove diameter ?