The 470 Capstick Pt.2

[Jefferry404]

Redding die is per Saami spec. Ghost shoulder to boot!

 

[CZDiesel]

Redding die is per Saami spec. Ghost shoulder to boot!
View attachment 704251

Nice! Where did you get the dies?

 

[DaBill]

Hi all! Im looking at a purchase of a 470 Capstick, I gathering info on this caliber. The rifle im looking at is a custom made on a Interarms Mark X action and a 20 in barrel with a fixed 2 in muzzle break. It weighs about 10 lbs (no scope or rings). Shorter barrel than you describe above so MV would be less for the same charge. If I were to keep the same 2250 ish fps it would still require more powder to get there. Not sure how a shorter barrel affects recoil but what im wondering is will it be a beast or a pussycat ???

 

[Ray B]

a Interarms Mark X action and a 20 in barrel with a fixed 2 in muzzle break. Not sure how a shorter barrel affects recoil

The closed system recoil would be similar to either barrel length- The open system, ie after the bullet leaves the muzzle would depend on the effectiveness of the brake and the pressure curve of the powder. A slower burning powder will generally have greater recoil due to two factors: an increased amount of powder relative to the faster powders and a significant amount of pressure as the bullet leaves the muzzle resulting in the jet-propulsion effect. It is possible that you could have a pleasant rifle to shoot if you can achieve the velocity you want by using one of the faster powders- .

 

[Jefferry404]

My Douglas barrel should ship out this week. Has a dual taper, the first one to fit the B&C CZ550 Magnum barrel channel, then a slower taper for more muzzle girth and weight.
We tried a 3D printed barrel with 3/8 dia. steel support rod but Douglas said was still too much flex on the duplicator, so they lathed it by hand.
Good folks there!

 

[Rosch]

Hell ... this cartridge never makes You undergunned! Even in Jurassic Park

 

[Jefferry404]

Link below for:
Thread '.474 groove 470 Capstick barrels'

https://www.africahunting.com/threads/474-groove-470-capstick-barrels.97841/

 

[CZDiesel]

@michael458 I went over to Keven Weavers place today with @CoElkHunter to shoot the 470 Capstick.
We had eight 10”x10” five gallon jugs that we filled with water and lined up for 80” of water filled jugs. They were set on a table 30yrds from the bench on a 100yd range.
We shot one of the 500gr Barnes Banded Solids into them and the followed with a 500gr Barnes TSX.
The Solid shot straight through all the jugs went down range another 70yrds, then went through a 1” thick piece of plywood, and then embedded itself in a sandy berm deep enough we couldn’t find it! The bullet traveled straight through the jugs with no diversion.
The XTP into the fourth jug and opened perfectly and again traveled in a straight line.
The recovered XTP has nice deep rifling grooves in it showing that the barrel is not oversized.
Was a fun exercise! I love this 470 Capstick!!!

 

[Jefferry404]

Just to put on a fine point. It is the groove that is oversized by 1/1000, not the bore.
For copper bullets, they might permanently obdurate at 40kpsi, depending on the annealing or if the throat pre-strains the bullet. At the same time, the barrel inner diameter expansion, aggravates the oversize.
So, for a short distance in the barrel, there might be no gas seal, and possible flame cutting erosion.
Does this matter, most likely not, as I shoot maybe 10-20 rnds a year, but just the engineer in me
Hence, the 0.474 groove barrels.
Steve