Thread: gongs

Is G350 (12mm or 16mm) a good steel for up to 300winmag at ranges from 200 out ?

Originally Posted by Pengy

Is G350 (12mm or 16mm) a good steel for up to 300winmag at ranges from 200 out ?

Na dont was your time with that, the 300 will smash it to bits, get some sort of biz or hardox.

I have a few biz80 gongs of various sizes, pm me if you like.

Biz 80 craters with a 270 wsm at 150 m brinel 400 or 450 really is the go but pricey.

Bis80 is short for Bisalloy 80 plate. Bisalloy is a brand, like Levi jeans. Bis80 is just a high tensile (HT) plate. Brinell is another brand but Brinell 400 is abrasion resistance plate (Wear plate).

I know steel, but I've never shot at it. People seem to think that Wear plate is better than HT for gongs. Don't worry about the brand/company names, Just ask for either HT or Wear plate.

And a rough way to figure the cost is to base it on around $7/kg maybe.

Height x length x thickness x 7.85 will give you the weight.

so a 200x200x12mm piece will be .2x.2x12x7.85

I think that'll work.

bis80 craters at 350yds with a 300win mag using 150gr projectiles

Ar500 plate is available but the cost of plate isn't the only factor in the cost.
If for example you bought a full sheet and payed processing cost into squares it's not too expensive. If you only wanted 2-3 squares you pay a premium
I think the last single square 200x200 was around $100 dollars whereas I could have got a 200x1200 strip into 6 pieces if I cut down myself for 200ish

Set up and processing is the real cost of these plates.
Sent from the swamp

Does HT steel cut just as easily as MS with angle grinder and cutting discs?

I've cut both but never bothered to think about it at the time.

Hey I'm not sure either. If your working it's just a case of hammer down rather than thinking about things like that. I'm getting lazy in my old age and get the guys on the plasma to burn them out. My boss is good line that and doesn't mind if we use his gear for perks. But on bigger things I don't mind paying consumables and time running


Sent from the swamp

Originally Posted by Marty Henry

Biz 80 craters with a 270 wsm at 150 m brinel 400 or 450 really is the go but pricey.

I have to ask why are you shooting gongs at 150m with a Wsm...

On that note @BRADS. I should have been clearer in first post.
I don't intend shooting steel at 200 with the 300 mag. We are setting a range up for general centre fire, and the 300 would be the upper end of cals used.

Brinell is a hardness testing method. Wear plates come in a variety of "brand" names including bisalloy. I have built targets for a number of years (15+)from a variety of different source materials and here is my observations:

Biz 80 is a high strength structural plate (not wear plate) with a brinell rating of 255. It is completely inadequate for targets. There are bisalloy plates that are wear plate that are suitable.

350 brinell wear plate will work for most pistol calibers.

400 brinell wear plate will work for all pistols calibers.

450 brinell may work for most centre fire rifles (308) from 50 meters depending on the plate.

500 brinell will always work for (308) centre fire from 50 meters and will work for magnums at 200.

All plates have a range of brinell figures they must fall within to meet the requirement. I have purchased plate in the past that was sold as Brinell 500 and on testing by SGS found that it was barely 450 brinell. This is plate from two different mills that failed actual testing even though it had a cert supplied by the mill. The plate I sell now always meets the 500 Brinell test.

Plates can still deform around the heat affected zone where the plasma cuts it. This is an area about 1.5mm from the edge of the cut. AP rounds will deform 500 and ss109 will leave little darts from the steel core embedded in the plate if struck mostly perpendicular.