Pure Wagyu beef gets marketed more than it gets explained. At Peter Augustus, Pure Wagyu is Fullblood only, meaning every animal in this range carries the complete Wagyu genetic line, not a crossbred approximation of it. That distinction, along with a 400 day grain finishing period and Stanbroke's internal SB grading scale, is what actually separates this range from everything else on the site.
This article covers what Fullblood genetics actually mean, why 400 days on feed matters, how the SB6 to SB10 grading scale works, how to cook a cut that sits at that grade, and when it earns its place on the table.
What Makes Pure Wagyu Beef in Australia Fullblood, Not Crossbred
Wagyu is not a marketing category, it is a breed, or more precisely a group of Japanese cattle breeds, the most common in Australia being Japanese Black. The breed is defined by a genetic predisposition to intramuscular fat, meaning fat develops within the muscle fibre itself rather than sitting as a separate layer around it.
In the Australian market, most Wagyu sold is crossbred, typically Wagyu bred with Angus, which shortens the path to market and produces a more moderate fat profile. It is a legitimate product, but it is a different product to Fullblood, which carries the complete Wagyu genetic line with no other breed in the pedigree.
Pure Wagyu at Peter Augustus is Fullblood only. No crossbred Wagyu is sold under this range. That is a sourcing decision, not a claim made for effect, and it is the reason the genetics section of this article can speak in absolutes rather than averages.
The 400 Day Finishing Period
Genetics set the ceiling. Time on feed determines how close the animal gets to it. Pure Wagyu at Peter Augustus is grain finished for a minimum of 400 days, well beyond the finishing period used for standard grain fed beef.
Four hundred days is not a random number. Intramuscular fat develops slowly relative to the rest of the animal's growth. Rush the finishing period and the animal reaches market weight before the marbling has matured, and no amount of Fullblood genetics recovers that shortfall once it has happened.
This is also where cost is genuinely earned, not manufactured. Four hundred days of feed, labour, and land is a real input cost long before the animal is ever graded or sold.
What the SB Score Actually Measures
Once the animal is finished, grading is what confirms whether the genetics and the time on feed actually delivered. At Peter Augustus, that is measured through Stanbroke's internal grading scale, referred to as SB. Pure Wagyu sits at the top of that scale, from SB6 through to SB10. For a full breakdown of how the scale works across every tier, Understanding the SB Marble Grading Scale covers it in detail.
The scale exists because marbling is not binary. A Pure Wagyu cut at SB6-7 and one at SB10 are both genuinely Fullblood, but they are not interchangeable, and pricing them identically would misrepresent the product. Right now, stock in the Pure Wagyu range sits at two points on the scale rather than spread evenly across it, entry at SB6-7 and the majority of the range at SB10. The grade is the checkpoint between a claim and a guarantee, and it is worth checking the current SB rating on the product page before you buy, since availability at each grade shifts with what is in stock.
What That Grade Delivers on the Plate
Higher marbling changes three things you will notice without needing to know the science behind them.
None of this means every dish calls for SB10. A slow braise does not need the top of the scale to succeed, and putting it there wastes what that grade is built for. Grade should match the occasion and the cooking method, not just the budget.
How to Cook It Without Wasting the Grade
The biggest mistake with a well marbled cut is treating it like a lean steak that needs help. It does not. The technique that respects the grade is simpler than most recipes suggest.
Bring it to room temperature first
A cold centre cooks unevenly and forces you to overcook the outside to reach the middle. Twenty to thirty minutes out of the fridge is enough.
Season with salt only
Heavy marinades and spice crusts mask the exact thing you paid for. Salt shortly before cooking is enough, the fat and the meat do the rest.
Cook hot and fast
A hot pan or grill, seared hard on each side, then rested. Prolonged low heat renders the fat out before the exterior develops any colour.
Rest it before cutting
Five minutes minimum. Cutting immediately releases the juices you just spent the entire cook retaining.
Slice against the grain, and slice thin
Higher marbled cuts carry more richness per bite, so thinner slices let you taste it properly rather than being overwhelmed by it.
So Is It Worth It
Worth is the wrong question if you are asking it in terms of price per kilogram against standard beef. That comparison flattens two different products into one line item.
The better question is whether you want predictability. Fullblood genetics, a 400 day finishing period, and a grading scale exist specifically to remove guesswork from an eating experience that would otherwise vary animal to animal. Choosing a graded cut means knowing what you are getting before you cook it.
For a special occasion where the method is built to showcase marbling, a sear, a quick grill, a dish where the fat is meant to be tasted rather than rendered away over hours, that predictability is the entire point. For everyday cooking or long, slow methods, a different cut may suit the method better, since that level of marbling was never the point of a braise or a stew.
Premium, without exception, does not mean the most expensive option regardless of context. It means the grade on the label matches the experience on the plate, every time.
Frequently Asked Questions
Is Peter Augustus Pure Wagyu Fullblood or crossbred?
Fullblood only. No crossbred Wagyu is sold under the Pure Wagyu range. Crossbred Wagyu, usually bred with Angus, exists elsewhere in the Australian market as a legitimate but different product.
Is this the same as Kobe beef?
No. Kobe is a specific, legally protected designation for Wagyu raised under strict conditions in Japan's Hyogo prefecture. Australian Fullblood Wagyu is a genuine, distinct product with its own genetics and standards, not a substitute for Kobe.
Does a higher SB score always mean a better steak?
Not for every dish. A higher grade means more marbling, which suits quick, high heat cooking. For long, slow cooking, a lower grade or a different cut will often give a better result for that method.
Do I need to cook it differently to a regular steak?
Yes. It cooks faster because the fat renders quickly, so a hot pan, a short cook time, and a proper rest matter more than they would with a leaner cut.
Why does Peter Augustus finish for 400 days when some Wagyu is sold sooner?
Marbling develops slowly. A shorter finishing period reaches market weight before the marbling has matured, regardless of the genetics behind it. The 400 day minimum is what allows the SB6 to SB10 grade to actually be earned.
Premium is not a claim here. It is the baseline.
Explore the Fullblood Pure Wagyu range, from SB6-7 through to SB10.
Shop Rib Fillet SB10 Shop Rump SB6-7