Corbin is now selling .218 rebated boat tail slugs

[Airgun-hobbyist]

For all of you longer range .22 caliber slug shooters, Corbin is offering and selling .218 sized rebated boat tail slugs in 28 and 34 grains. It comes to $0.13 each which isn't comparatively cheap to a strait walled slug, but may fly exceptional with the right barrel and tune.

Corbin .218 Caliber Airgun Slug - 150 count

- Superior terminal ballistic performance and expansion. - Dish Base (DB) or Rebated Boattail (RBT) for enhanced performance. - 28gr and 34gr for varied applications. - Proudly Precision Swaged in the USA

www.corbins.com

 

[JaceSpace1369]

For all of you longer range .22 caliber slug shooters, Corbin is offering and selling .218 sized rebated boat tail slugs in 28 and 34 grains. It comes to $0.13 each which isn't comparatively cheap to a strait walled slug, but may fly exceptional with the right barrel and tune.

Corbin .218 Caliber Airgun Slug - 150 count

- Superior terminal ballistic performance and expansion. - Dish Base (DB) or Rebated Boattail (RBT) for enhanced performance. - 28gr and 34gr for varied applications. - Proudly Precision Swaged in the USA

www.corbins.com

Would it be safe to assume that the 28gr bt would have a deep hollow cavity given it's length?

 

[Airgun-hobbyist]

I am not sure as to nominal length versus hollow point depths there, as I do not have that caliber of swaging set to mess around with. The pictures don't really indicate that it is a deep hollow point though.

 

[Chukar60]

If you expand the picture that is very clearly a hollow point slug.

 

[BlackICE]

For magazine fit, what are the length of each type?

Great that these are sold. I assume you can buy a set of dies that will swage the same slugs. Reduces the unknowns in buying an expensive die set and press!

 

[Airgun-hobbyist]

If you expand the picture that is very clearly a hollow point slug.

Yes, it is definitely a hollow point slug. But how deep the cavitiy sits relative to the tail and it's overall length is what is being questioned. A deep hollow point will add length to gain flight stability and to better keep the center of gravity centered along the length so it tips over flight apex smoothly.

 

[Ta-Ta Toothie]

The depth of the HP will be the same on a 28 and 34 gr. The same non adjustable ejector punch is used on all bases etc.

 

[Ta-Ta Toothie]

Just made some the other day. 36.5 gr

 

[woogie_man]

To get them shooting correctly you will need around the 36 grain and around 1000fps. I have played with other weights and didn't have much luck. Though I am hoping with the hollow ogive punch coming I will have better luck

 

[Ta-Ta Toothie]

I'm just getting started with the rbt and the little time I had with them are actually pretty good.

 

[Ballisticboy]

I'd be worried that the angle the air has to turn through to follow the boat tail is too great, it looks to be about 15 degrees from the pictures. If the air is not following the boat tail, it will not give the expected reduction in drag. There will be a small increase in BC due to the increased sectional density from the mass of the boat tail, but little or no change in form factor.

 

[Ta-Ta Toothie]

Shot a few today using the same dope and weight as the dish bases and they are shooting about 1/2 moa higher @ 100y. Not much of a difference. They seem to be as accurate as the dish bases which is pretty good. Going to play around with some different weights.

 

[Ta-Ta Toothie]

If it matters any, the boat tail is @ 10°

 

[SDellinger]

How much ballistic improvement at subsonic velocities?

 

[Ta-Ta Toothie]

So far, not very much. POI is a little higher vs a standard base.

 

[Ballisticboy]

You need to include the rebate height as well, as the air has to be able to turn down from the slug diameter to the base diameter, so it is not just the actual boat tail angle. The total angle matters a lot, as if it is too large the air will simply not follow the boat tail and there will be little to no reduction in drag.