200 grain 6.5 revisited (Attention Elkaholic, and Hammer)

[HARPERC]

.....looks like a missile! How long is it?........

1.835" at last check-subject to change.

 

[RockyMtnMT]

Fired the 6.5 Ultracat yesterday. The heavier spring looks to have solved the primer cratering. We caught the bullet and there is no signs of trouble with the fast twist. No slippage or wringing. Now it is just a matter of finding proper balance point on the looonngg bullet to get dynamic stability.

 

[codyadams]

Fired the 6.5 Ultracat yesterday. The heavier spring looks to have solved the primer cratering. We caught the bullet and there is no signs of trouble with the fast twist. No slippage or wringing. Now it is just a matter of finding proper balance point on the looonngg bullet to get dynamic stability.

That's awesome. I know you probably haven't experimented much, but are you finding more stability with newer powders?

 

[RockyMtnMT]

That's awesome. I know you probably haven't experimented much, but are you finding more stability with newer powders?

Can't say that we have found difference in stability from one powder to another. Possible I guess. Definitely see difference in accuracy from powder to powder.

 

[codyadams]

Can't say that we have found difference in stability from one powder to another. Possible I guess. Definitely see difference in accuracy from powder to powder.

I just recall earlier in this thread, mention of an extremely overbore cartridge like this having a hard time getting consistent loads that would stay within pressure range day to day. It's certainly turning into a hard hitting rail gun!!!

 

[HARPERC]

.....I just recall earlier in this thread, mention of an extremely overbore cartridge like this having a hard time getting consistent loads that would stay within pressure range day to day....It's certainly turning into a hard hitting rail gun!!!.......

Using todays powders, and 40 grain heavier bullet seems to have made Steve happier.

A couple of more tweaks left, but quite a lot's been done considering we're about 18 months from conversation to range time. Steve and Brian certainly have my appreciation for shouldering the project. Hopefully, it adds to the collective knowledge base.

I really think fast twist barrels, and long mono's, solids, or however we refer to them, will be a solid addition to long range shooting. In these smaller calibers especially.

Looking forward to launching some long range 'chucks this spring.

 

[couesaddict]

I'm glad to see things are coming together for you guys. Definitely seems it's been a long, and I'm sure expensive road to this point. Pretty cool watching the innovation.

 

[HARPERC]

For nothing off the rack it's actually pretty good time in my experience.
Probably could have cut a little time going round about a stock, but I think we got the correct one.

 

[HARPERC]

https://www.longrangehunting.com/threads/lija-1-7-30cal.219230/#post-1624438

I didn't intend to import the whole thread, just the portion that relates to this thread.

Under the heading of new information (education), dynamic stability is a new phrase to me. Meplat designs effect is a new thought, and thinking getting the bullet (material) to survive the initial forces, and transition in the barrel would be the obstacles most likely to require overcoming.

Steve 1) any thought of attempting without the hollow point?
2) Always have had the thought of using whatever we come up with in a more useable package (My #1), do you think kept at 2800-3000 fps this is a useable hunting bullet or do you see the issues so far carrying over to terminal ballistics?

 

[RockyMtnMT]

Right now the goal is to get the heaviest, pure hunting, long range bullet that will stabilize at high vel. 1.8" 6.5mm bullet is just to long.

I am interested to see if the longer bullets will be stable with a smaller meplat. Target style.

 

[HARPERC]

....Right now the goal is to get the heaviest, pure hunting, long range bullet that will stabilize at high vel......

My goal remains education and entertainment, and we continue to be successful. Keep it fun, and remember you have artistic license.

 

[Steelflight]

Reading this I must say. Wel done. That's quite a boundary you guys are pushing. Rooting for ya.

 

[RockyMtnMT]

Right now we are back to the hurry up and wait while the bolt is sent off to get the firing pin hole bushed to stop the excessive catering. Sigh!

 

[NEMTHunter]

I am interested to see if the longer bullets will be stable with a smaller meplat. Target style.

So am I Steve. This really interests me.