What is the .30 TC case based on?

Zrex - Ridgerunner is not wrong. There's more than one road which leads to Rome.

22-250 Remington lineage:
250-3000 Savage --> 22-250 Remington

6.5 Creedmoor Lineage:
250-3000 Savage --> 300 Savage --> 30 TC --> 6.5 Creedmoor

So not surprisingly, the 6.5 Creedmoor is easily formed by necking up and fire forming its "great uncle" - the 22-250 Rem.

By and large, I enjoy the 6.5 C for what it is - a cheap to shoot, low recoil, high BC, moderate velocity, long-range TARGET capable cartridge. I think it's PERFECT for those guys who want to bang 3-4MOA steel at 1,000yrds then hunt deer at 600yrds and feel good about long range shooting.

Those guys who really kill game at ELR realize its shortcomings.

Regardless of what I might personally believe about the PRS/6.5/tactical trend, I'm tickled pink to see so many new folks buying new rifles and learning marksmanship principles. While Admiral Yamamoto never actually said it, I strongly believe in the principle General MacArthur's historian Gordon Prange conveyed in his fictional quote, "[Japan] cannot invade the Mainland United States. There would be a rifle hiding behind every blade of grass," which was a principle shared by President Theodore Roosevelt back in 1901 when he signed the NBPRP, under which in 1903 the DCM established the CMP, and the same principle which lead to the formation of the NRA in 1871 to develop a common national foundation of marksmanship, still a driving principle of the NRA Training Division. And of course, a principle shared by the Founding Fathers in drafting the Bill of Rights. Any reason an American citizen learns fundamental marksmanship skills is a good reason.

i dont see how it can be based on the 22-250 case, they share nothing in common, the 250 is a tapered case and the creed is not and the shoulder angle is different, the creed is more like an ackley, but it is what it is, i think its probably the best factory chambered short action cartridge.
the 250 and 22-250 literally have the same case dimension the creeds not even close. the 300 and the 250 also share nothing in common. the only thing they share is the case head size, maybe im just nit picking, the 250 is the parent case of the 22-250 they share identical specs, the 22-250 is not the creeds parent case, the 30 tc is, and i have no idea what its parent case is, you could easily say a 30-06 , or 308 or 300 savage as they have have the same case head size but thats it.
the 22-250 has a case capacity of 44.6 gr
the creed has a case capacity of 53 gr
i stand buy what i said the creed is not based on the 22-250 case

Have you ever formed cases from a parent case? do you have a clue?
RR

I'm going out on a limb here and say NO to that one RR. zrex, case parentage goes back more than just the first generation. You do know that the .308 case is based off a .300 savage right? And you do know the .300 savage was based off a 250-3000 Savage right? Care to guess what a .22-250 case is based off of??? SURPRISE!!! .250-3000... Now...want to guess what the .30TC is based off of??? Well actually it wasn't!! It was basically TC and Hornady trying a rimless cartridge with damn near identical dimensions of the .308, though a tad shorter and getting a bit more speed than the .308 with their formula factory load. Easy to manipulate that data but I digress. The point here is zrex, you can form a case for the 6.5CM from just about any case from the 250-3000 family. In all actuality, a .243 case makes a fine 6.5CM case!

You can lead a horse to water...

Re-read my post. I gave you the cartridge lineage showing both the .22-250 and the 6.5creed go back to the same 250-3000 savage case, and even cited the 22-250 as the "great uncle" to the creed. Whether you understand how cases are formed or not, that IS HOW THE CREED CAME TO BE. .250-3000 savage begat the .300 savage which begat the 30tc, which begat the 6.5 creed. For cases which share a common case head and rim, as long as the brass is long enough, you can almost make anything out of anything - just depends how much work you want to do, fireforming, multi-step sizing, neck reaming and turning, cutting and trimming, etc. While they may not have started with 22-250 brass to develop the creedmoor, they started with a case in the same family, so again - more than one road leads to Rome.

Want 6.5 brass? Neck up some 22-250, push it back down to create a false shoulder (or pull to 6.5 and seat the bullets jammed) and blow out the case and shoulder. Bang - 6.5creed brass with 22-250 stamps. It's not rocket science.

thats my point just because you can make a case from any short action cartridge into a creed doesnt make it its parent case.

Nobody ever said the .22-250 is the parent case for the 6.5, your straw man is moot.

Ridge said it's nothing more than a blown out, necked up 22-250. Which is true.

Now, back to a topic which might aid the OP - what I really would like to know (having only a few hundred rounds through my 6.5 myself), is how all of these PRS guys recommending the 6.5 creed are ignoring the barrel life issue. The more guys I talk to, the more I'm hearing barrel life is in the same ballpark as the 6.5-284 or 7Prac/7rum. Won't surprise me if it is, but I'm not sure how you can recommend the 6.5c as cheaper to shoot than a 308win if the barrel life is half as long. I haven't burned one myself yet, so time will tell (if I keep this thing that long), but it seems barrel life may be one of those "gotcha's" for the 6.5. Not that a 260r barrel would last longer, of course.

https://www.facebook.com/photo.php?f...9230584&type=3
L2R
260 AI, 260, 6.5 Creed, 6.5-250 Imp, 6.5X47 Lapua If you look at the pic, the only difference between the creed and the 250 Imp. is the 30 vs. 40 degree angle of the shoulder, the 22-250/250 sav. original shoulder is close to 30 degrees
RR

I haven't heard this at all I only have 250ish rounds through mine, but all the guys I'm hearing from that shoot competitively and recreationally are reporting good barrel life. 7RUM is a barrel ripper if I only get 1000 rounds out of my barrel I'm not gonna be a happy camper.