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So I built a couple sabot hunting rifles out of CVA scout rifles in 45/70.
One for my son and one for myself.
My goal is to build a walkabout/ tree stand gun with an effective range of 200 yards.
So off to the store and we both came back with blued cva scouts.
I went with a modified savage ml2 breach plug and prb variflame ignition.
Our target load for both builds is 57 grains of imr 4198 with a furry 225 in a HLB.
I'll have to start another build thread on the guns. Although I'll post a picture of each here.
Plain plastic stock for my son
Boyds stock on mine.
Here is where it gets to the point of the post.
At our first range season we both had issues loading sabots. The rifling was sharp at the crown cutting the sabots upon entry.
I wish I had a picture but I don't.
The loading was inconsistent at best.
The groups left some accuracy on the table.
Tge first two started farely straight and shaved a little.
The 3d shot on right shaved alot. And dispersed accordingly.
Cosistencey wasnt there.
So off to the work shop to address the issue
The stock crown is a recessed flat crown.
I used my target 11 degree cutter to angle and deepen the crown.
Then used the 90 degree cutter to heavily champher the crown. I had to run a pilot on the lathe to that bore to keep the crown concentric to the bore.
Tge finished machine work.
After blue touch up
Sabot pushed down after new crown
Off to the range.
I noticed that the sabot was much tighter to load but more importantly very even down the bore and no more plastic shaving.
Now if I pay attention when I start the round I get much better results.
5 shot group the first 2 I noticed tge petals weren't square but I'd already started them so I shot them. They are high in the group.
The next 3 in the lower right area were started with much more care and precision
Making sure they were squared up before starting them.
Going to shoot it more and get used to it more.
I think with care in loading I will have a nice walk about rifle.
John
One for my son and one for myself.
My goal is to build a walkabout/ tree stand gun with an effective range of 200 yards.
So off to the store and we both came back with blued cva scouts.
I went with a modified savage ml2 breach plug and prb variflame ignition.
Our target load for both builds is 57 grains of imr 4198 with a furry 225 in a HLB.
I'll have to start another build thread on the guns. Although I'll post a picture of each here.
Plain plastic stock for my son
Boyds stock on mine.
Here is where it gets to the point of the post.
At our first range season we both had issues loading sabots. The rifling was sharp at the crown cutting the sabots upon entry.
I wish I had a picture but I don't.
The loading was inconsistent at best.
The groups left some accuracy on the table.
Tge first two started farely straight and shaved a little.
The 3d shot on right shaved alot. And dispersed accordingly.
Cosistencey wasnt there.
So off to the work shop to address the issue
The stock crown is a recessed flat crown.
I used my target 11 degree cutter to angle and deepen the crown.
Then used the 90 degree cutter to heavily champher the crown. I had to run a pilot on the lathe to that bore to keep the crown concentric to the bore.
Tge finished machine work.
After blue touch up
Sabot pushed down after new crown
Off to the range.
I noticed that the sabot was much tighter to load but more importantly very even down the bore and no more plastic shaving.
Now if I pay attention when I start the round I get much better results.
5 shot group the first 2 I noticed tge petals weren't square but I'd already started them so I shot them. They are high in the group.
The next 3 in the lower right area were started with much more care and precision
Making sure they were squared up before starting them.
Going to shoot it more and get used to it more.
I think with care in loading I will have a nice walk about rifle.
John