CVA Accura and load and bullet choices

[Archeryrob]

Who is shooting one and what are you shooting in it? My last gun I used 80 grains of 777 with a felt wad and 240 grain lee real on top of it and dead on. The same load and bullet is producing flyers and I can't even hit the target unless at 25 yards. I would prefer to cast my own as I always have done, but this gun is not liking this setup right now.

 

[Doco Overboard]

Is it 45 cal bullet? 240 grain is right around between 45 -50 REAL molds.
I had to reduce main charge at times after casting some lee REAL bullets.
But it was only in rifles that had been shot a ton and were made with shallow rifling.
Sometimes I think it has to do with the hardness of the alloy and total number of area of the lands/groove number.
CVA rifles in the past used to have relatively deep grooves.
I'm not sure what their modern barrels are like becuase I dont have any of them.

I never had any real super accuracy issues at 25 yds either. Just a greater cone of dispersion at 100 yds. Nothing that would'nt prevent me from shooting them instead of melting them back down. A 240 gr bullet would almost be kind of short for combating the effects of bullet heating in proportion to powder column length too.
On a Real bullet, the driving band is at the front, but a CVA should also have a QLA barrel to help keep it straight so you would think it would shoot pretty well from the start.

 

[Archeryrob]

Mine is a 50 and her is a 45. The grooves seem more inline with modern shallow grooves and it is not as deep as like my hawken. Maybe the soft lead is just stripping out being fired.

Looks like this thing is only going to fire sabots or copper jacket bullets, from what I see so far.

 

[Doco Overboard]

I would try not using the wool wad and reduce the powder charge 10% especially in the 45 rifle.
Make half a dozen shots and see what happens. 25 yards being a problem is kind of close though it seems.
You see, I dont use any other powder other than Pyrodex RS except real BP even in my hunting rifles.
Its because o I can get consistent seating pressure while loading.
I do however use Pyro P in one of my target rifles and it happens to be a 45.
I dont have anything against any of the other substitute powders its just what work for me so I dont find them necessary.

 

[Archeryrob]

I ordered some 452-451 sabots from cabelas and the Lee 452-255-RF mold elsewhere. 255 grain with flat meplat and I can put it in my 45 colt if it don't like it.

 

[Blacksmith101]

What is the twist rate?

 

[mauser58]

I have one I bought about four years ago with the stainless steel looking nitride fluted barrel. I use two 777 50 grainers. Use a powerbelt projectile which is copper

 

[Archeryrob]

What is the twist rate?

1:22 I think. The other gun I had that blew up had deeper grooves. This one are more like my Bergara 30.06 barrel with raised lips for grooves. They sell it as the Bergara barrel, So it is made the same way and I think made for more modern projectiles. I think the soft lead is just stripping out. I mean at a 100 yards I can't hit a 2'x2' sign.

 

[Blacksmith101]

1:22 I think. The other gun I had that blew up had deeper grooves. This one are more like my Bergara 30.06 barrel with raised lips for grooves. They sell it as the Bergara barrel, So it is made the same way and I think made for more modern projectiles. I think the soft lead is just stripping out. I mean at a 100 yards I can't hit a 2'x2' sign.

For muzzle loaders that is a fast twist rate barrel meant for sabots or conicals. Remember the Greenhill Formula is about bullet length vs velocity.

If you want to shoot round balls in a "fast twist" barrel you need to slow the velocity i.e. reduced loads.

There is a good discussion and some good information about modern muzzleloaders twist rates here:

Twist rate and bullet selection

I've read that the the accuracy of a particular gun is greatly influenced by the twist rate of the barrel and the bullet selected by the shooter. That said, I never see any discussion on how to choose the bullet. Short of just buying a bunch of bullets/sabots and shooting countless shots, what...

www.modernmuzzleloader.com

 

[Archeryrob]

Anyone shooting A CVA Accura? I cast 255 grain .452 bullets and tried them today in sabots with 80 grains and 70 grains of FF 777. I was having conflicting shoots trying to bring it in and then I missed the target, got closer and shot two more times and more just flying. I had 6 power belts from from years back and damn near shot a bulls eye with the first one. Do these guns only like copper jackets?

 

[Archeryrob]

Buddy just told me maybe not sizing them in the .452 die could have caused a problem, but I never sized reals. Maybe making inconsistent pressures. Maybe I'll try that in the spring. I got 5 Powerbelts for the December season.