200 grain 6.5 revisited (Attention Elkaholic, and Hammer)

[GLTaylor]

Wow! Tagging in...

 

[TXAoudadKlr]

Wait so what was the chamber for this?

 

[Mike D Texas]

Here is the 200y target when I zeroed the rifle. We did shoot it at 4030 fps but had a bit of bolt lift so backed off. It was about 50* out so next step is to take it out whenit is hotter out and see if it stays stable.

What did I miss in this thread? What thermo-nuclear cartridge is pushing a 200 grain 6.5 bullet at 4k fps?

 

[7mmShooter]

What did I miss in this thread? What thermo-nuclear cartridge is pushing a 200 grain 6.5 bullet at 4k fps?

124gr not 200gr

 

[Mike D Texas]

124gr not 200gr

Ah. I didn't read through the entire thread. But that still smoking fast. What cartridge?

 

[7mmShooter]

Ah. I didn't read through the entire thread. But that still smoking fast. What cartridge?

Not sure but a 6.5 Rum or similar comes to mind, maybe OP will chime in

 

[HARPERC]

6.5 Ultracat, basically an improved Remington Ultra Case.

 

[RockyMtnMT]

We call it the 6.5 UltraCat. It is a 300 rum necked down to 6.5 with a 40* shoulder. We did this reamer about 10 years ago. Back then we did not have much choice in brass and powder. We were not able to settle the load down when using us869. Temp changes would spike the pressure terrribly. Next we will take it out and shoot at a 30*-40* increase in temp and see if there is issues with the Ramshot LRT. We are at a pretty top end load now, we did take it a grain higher and started to get a bit of heavy bolt lift ant 4030 fps. I guess we are 10 fps under the goal of 4000 fps. So far so good.

 

[Mike D Texas]

We call it the 6.5 UltraCat. It is a 300 rum necked down to 6.5 with a 40* shoulder. We did this reamer about 10 years ago. Back then we did not have much choice in brass and powder. We were not able to settle the load down when using us869. Temp changes would spike the pressure terrribly. Next we will take it out and shoot at a 30*-40* increase in temp and see if there is issues with the Ramshot LRT. We are at a pretty top end load now, we did take it a grain higher and started to get a bit of heavy bolt lift ant 4030 fps. I guess we are 10 fps under the goal of 4000 fps. So far so good.

Thanks for the info. I'm looking to build a big 6.5 barrel burner, can you message me info on the reamer if you still have it?

 

[6.5-300 BEE]

Regrouping. Apparently action unsuitable for the Lapua case. Thoughts on what case would launch a 160 grain 6.5, roughly 3000 fps?

Probably a 6.5-300 BEE with a long bbl. Mine is 30". 3700 w/127.

My 36" 338 RUM launches a 300 Berger @3000.

 

[6.5-300 BEE]

We call it the 6.5 UltraCat. It is a 300 rum necked down to 6.5 with a 40* shoulder. We did this reamer about 10 years ago. Back then we did not have much choice in brass and powder. We were not able to settle the load down when using us869. Temp changes would spike the pressure terrribly. Next we will take it out and shoot at a 30*-40* increase in temp and see if there is issues with the Ramshot LRT. We are at a pretty top end load now, we did take it a grain higher and started to get a bit of heavy bolt lift ant 4030 fps. I guess we are 10 fps under the goal of 4000 fps. So far so good.

Have you tried RL 33, H869 or 50MG ?

 

[TXAoudadKlr]

Bit wild reading about a 6.5 with 4400ft lbs

 

[HARPERC]

.....Bit wild reading about a 6.5 with 4400ft lbs........

I hadn't calculated that. It should be enough to launch rock chucks!

 

[TXAoudadKlr]

I'd be super comfortable taking all but the biggest of NA game with it! I'm curious if a 6.5 Lapua is still in the cards to test?