10MM Velocity Comparison-(3) Guns- 4 different barrel .

[REDLINE]

Thanks.  My thoughts were based on a WAG that when the bullet engages the rifling (beginning of partial barrel obstruction + twist or spin on the bullet, all at the same time), that that would probably be where greatest resistance would be met, and therefore greatest peak pressure.

[475/480]

This is completed *
The QuickLoad pressure predictions have been added to my chart.


Sean

[nickE10mm]

I put this on another forum and thought it should be here also.

Hey there sir,

I'm curious what kind of pressure signs you're seeing with your AA7 200gr XTP loads.  Super high velocity... speeds I'm really leary of since you're using AA7... plus, the AA9 numbers are lower?  Do you regularly push 200gr XTP's with AA7??   Those speeds even seem high for a 180gr XTP....

Please explain!  Inquiring minds want to know!  If I could use AA7 for 200gr bullets and get that velocity, I'd use NOTHING BUT AA7....

[REDLINE]

That really is an awesome comparison.  I wish we had one like that for factory ammo too.

[475/480]

Hey there sir,

I'm curious what kind of pressure signs you're seeing with your AA7 200gr XTP loads.  Super high velocity... speeds I'm really leary of since you're using AA7... plus, the AA9 numbers are lower?  Do you regularly push 200gr XTP's with AA7??   Those speeds even seem high for a 180gr XTP....

Please explain!  Inquiring minds want to know!  If I could use AA7 for 200gr bullets and get that velocity, I'd use NOTHING BUT AA7....

Hi ,
I must say,  ALL  I have ever used in the 10MM for top end loads is AA7. Pressure signs are not severe in any of the 180 gr and 200 gr XTP loads, the STI and Caspian gun throws the brass 20+ feet .. And of course every gun is different , I thought I would have a little better velocity with AA9 but it did not happen.
The primers do flatten out as you approach the higher pressure ( 38,000+/-) PSI but I think that is fairly normal with Winchester-LP primers and top end loads.
Also MOST (NOT all) of the higher pressure loads were shot in fully supported barrels-- STI, Caspian ,LWD.

Sean

[REDLINE]

ALL  I have ever used in the 10MM for top end loads is AA7. Pressure signs are not severe in any of the 180 gr and 200 gr XTP loads...

Sean

Interesting.  I'll have to give some a try once I'm up and running.  That does go against what Accurate's own 10mm load data shows, but clearly worth a try anyway.  How clean of burning is it (AA7) in your view?

[Bro KV]

I'm on data overload!!!  I love it!

[475/480]

Interesting.  I'll have to give some a try once I'm up and running.  That does go against what Accurate's own 10mm load data shows, but clearly worth a try anyway.  How clean of burning is it (AA7) in your view?
[/quote]
IMO -AA7 burns very cleanly. I am going out of town at 1pm today going to Goliad ,Tx . I will try to get a hog with the STI 10 with 215 gr WFNGC at 1230 fps, this load shoots great at 25-50 yards LOAD - AA7 -11.0gr
This target was shot at 25 yards from the bench with the 215 gr WFNGC at 1230 fps.

Sean
http://i184.photobucket.com/albums/x150/475480/STIrangstargetpics004.jpg

[sqlbullet]

This is completed *
The QuickLoad pressure predictions have been added to my chart.


Sean

I am working on updating the table and putting it in the original post.  It may take me a day or two as I figure out the best way to include the new data.

[sqlbullet]

Or maybe I will get stuck on a conference call and do it in an hour

Original post updated with latest data in table, and thread is now tacked.

[REDLINE]

Interesting.  I'll have to give some a try once I'm up and running.  That does go against what Accurate's own 10mm load data shows, but clearly worth a try anyway.  How clean of burning is it (AA7) in your view?

IMO -AA7 burns very cleanly. I am going out of town at 1pm today going to Goliad ,Tx . I will try to get a hog with the STI 10 with 215 gr WFNGC at 1230 fps, this load shoots great at 25-50 yards LOAD - AA7 -11.0gr
This target was shot at 25 yards from the bench with the 215 gr WFNGC at 1230 fps.

Sean
http://i184.photobucket.com/albums/x150/475480/STIrangstargetpics004.jpg
[/quote]

Good to know.  Went with your thoughts and loaded up some AA7 under some 155gr XTPs.  I haven't seen the results yet, and it is my first attempt at handloading, but will find out one of these days.  Right now I'm looking to get my crimping issue figured out before moving further, as you can see in my new threads in this subforum.

[cwlongshot]

Interesting.  I'll have to give some a try once I'm up and running.  That does go against what Accurate's own 10mm load data shows, but clearly worth a try anyway.  How clean of burning is it (AA7) in your view?

IMO -AA7 burns very cleanly. I am going out of town at 1pm today going to Goliad ,Tx . I will try to get a hog with the STI 10 with 215 gr WFNGC at 1230 fps, this load shoots great at 25-50 yards LOAD - AA7 -11.0gr
This target was shot at 25 yards from the bench with the 215 gr WFNGC at 1230 fps.

Sean
http://i184.photobucket.com/albums/x150/475480/STIrangstargetpics004.jpg

Good to know.  Went with your thoughts and loaded up some AA7 under some 155gr XTPs.  I haven't seen the results yet, and it is my first attempt at handloading, but will find out one of these days.  Right now I'm looking to get my crimping issue figured out before moving further, as you can see in my new threads in this subforum.
[/quote]

DAMN good shooting Sean!!  What was the distance?

Personally I haven't used AA7 in some time, no real reason other then other powders have worked well enough I did not "need" to look farther.

CW

[475/480]

DAMN good shooting Sean!!  What was the distance?

CW
[/quote]

Distance was 25 yards off bench.

I bought 1lb of Longshot this weekend and will get some loads worked up with Nosler 135,150,180 gr HP's and Hornady 180 and 200 gr XTP.

Sean

[cwlongshot]

DAMN good shooting Sean!!  What was the distance?

CW

Distance was 25 yards off bench.

I bought 1lb of Longshot this weekend and will get some loads worked up with Nosler 135,150,180 gr HP's and Hornady 180 and 200 gr XTP.

Sean
[/quote]

I bought my first pound of longshot last month too!! So far I haven't reached top loads but velocity is very respectable!

I like Bluedot as well as 800X for top loadings. I'm hoping Longshot is as good at lower pressures. So far it appears it will be.

CW

[Yondering]

I put this on another forum and thought it should be here also.

Hey there sir,

I'm curious what kind of pressure signs you're seeing with your AA7 200gr XTP loads.  Super high velocity... speeds I'm really leary of since you're using AA7... plus, the AA9 numbers are lower?  Do you regularly push 200gr XTP's with AA7??   Those speeds even seem high for a 180gr XTP....

Please explain!  Inquiring minds want to know!  If I could use AA7 for 200gr bullets and get that velocity, I'd use NOTHING BUT AA7....

That data lines up pretty well with my AA7 and AA9 results too. Hornady published AA7 data with those loads in one of their manuals, but then backed way off in later manuals. Some claim Hornady printed a mistake with those hotter loads; I'm not so sure. 15gr AA7 under a 155gr MG JHP runs at 1600 fps from my 6.6" G20L.

AA9 gives lower velocity because it's bulky, and limited by case capacity, not pressure.