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  #11  
Old 10-30-2017, 09:30 AM
Mark527vARMINT Mark527vARMINT is offline
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Quote:
Originally Posted by B23 View Post
QuickLoad shows Lovex DO63 as being quite a bit faster than AA1680 and 11.9gr with a 25 Vmax shows as being over 72,000 PSI load, even stretched out to a COAL of 1.860.
Interesting On the bottle/tub of powder it has a sticker saying Formerly (AA1680) and the Importer says its the same stuff ?.
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  #12  
Old 10-30-2017, 09:44 AM
Mark527vARMINT Mark527vARMINT is offline
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Quote:
Originally Posted by rhouser View Post
Mark527Varmint, I am using the CFE BLK which is one step from the 1680 on the 15/16 Powder Chart from Hodgdon.

I am loading to 1.480 using the .17 insert on my Stoney Point comparator. This equates to about 1.789" using a Starrett digital caliper.

My last attempt chronographed 5 shots as follows: MIN: 3216, MAX: 3295, AVG: 3258, SD: 29.3, ED: 79.

The Accurate Powder book show 1680 for a 25gr VMAX to MAX Load of 10gr with a Velocity of 2,983. This is with an OAL of 1.711. The book load is using a WIN WSR primer and shot out of a 10tw 24" Barrel.

Your load is up 1.9gr over the recommended 10gr "book" max for A-1680 in the 17HH with the 25gr VMAX. I have no problem with that after 50 years of reloading.

Can you give me the COL you are using and a muzzle or 10' (chrony) velocity? I suspect you may be north of my 3258 fps.

It would take very little encouragement to get me to try again. I would just need a target velocity and COL for a working version.

I am a little cautious since I blew the extractor off my SAKO 243AI during load development of a "top limit" for w-760.

Thanks to all who make this forum great.

rch
My case trim length is 1.340, 25grn Vmax are seated to 1.749 coal or 1442 to the ogive , And i get 3258 @10ft . from a 24" 1-9twist factory barrel, which i bedded and brass pillar bedded.
I am also on the 11 reload of the Hornady brass without loosing any to splits , I have annealed after 3 firings. But i am moving onto fire formed RWS brass , which i am on 10.5grn of DO63 to form a very good case, anymore they split, any less they dont form too good.
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  #13  
Old 10-30-2017, 10:29 PM
rhouser rhouser is offline
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I just loaded 5 more of the 25gr Hornady VMAX. I dropped the charge .3 gr and seated the bullet to just over SAMMI. Maybe it needs the jump. Thinking back, the 60 VMAX in .223 did something similar and didn't come together till I substantially increased the distance to the lands.

We shall see.

I will report after I shoot these.

v/r rch
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  #14  
Old 10-31-2017, 02:52 PM
charlesasmith charlesasmith is offline
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Default 25 gr VMax

Are you sure that you have a 9 twist barrel? Might check to see if it actually has slower twist. My 17MIV 10 twist barrel will not stabilize the longer shank 25 gr VMax, but like yours will stabilize the Hornady 25 gr HP.


Chuck
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  #15  
Old 10-31-2017, 07:05 PM
hemiallen hemiallen is offline
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I think I already mentioned this, remove the plastic tip on those Vmax 25's and you might remove the instability issues. Pull them, cut with diagonal cutters, etc,.

Trust me, it has worked on a few 22 tipped bullets, might work for you as well. Sierra suggested it to my FIL and the Tech said it works most of the time.

Allen
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  #16  
Old 11-01-2017, 03:49 PM
rhouser rhouser is offline
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Ok, resolved. My CZ-527-V 17HH will shoot the Hornady VMAX 25 to .5" groups.

It was the jump. I dropped the COL of 1.480" (.17 comparator insert) down to 1.425" (.17 comparator insert). This is a decrease in COL of .055". I was still a touch over the SAMMI, but, not much.

I decreased the powder by .3 grains to account for the deeper seating. I just shot a Very Honest .5" (edge to edge, not adjusted) 5 shot group at 100. My load today was as follows:

Hornady Case trimmed to 1.34", Fed GM 205, 11.3gr CFE-BLK, and Hornady 25gr VMAX seated to 1.425" (.17 comparator insert).

I will take my chrony next time and see where I am at velocity. Today, the primers are nicely flattened with no pressure signs.

I need to rename this thread "MAN, those Hornady 25gr VMAX bullets shoot good in my 527-V".

Thanks to all who helped with this.

v/r rch

Last edited by rhouser; 11-01-2017 at 08:44 PM.
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  #17  
Old 11-01-2017, 06:04 PM
Mark527vARMINT Mark527vARMINT is offline
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Im glad you got sorted ;-)
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  #18  
Old 11-02-2017, 10:03 AM
Jeremy(WI) Jeremy(WI) is offline
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Quote:
Originally Posted by rhouser View Post
Ok, resolved. My CZ-527-V 17HH will shoot the Hornady VMAX 25 to .5" groups.

It was the jump. I dropped the COL of 1.480" (.17 comparator insert) down to 1.425" (.17 comparator insert). This is a decrease in COL of .055". I was still a touch over the SAMMI, but, not much.

I decreased the powder by .3 grains to account for the deeper seating. I just shot a Very Honest .5" (edge to edge, not adjusted) 5 shot group at 100. My load today was as follows:

Hornady Case trimmed to 1.34", Fed GM 205, 11.3gr CFE-BLK, and Hornady 25gr VMAX seated to 1.425" (.17 comparator insert).

I will take my chrony next time and see where I am at velocity. Today, the primers are nicely flattened with no pressure signs.

I need to rename this thread "MAN, those Hornady 25gr VMAX bullets shoot good in my 527-V".

Thanks to all who helped with this.

v/r rch
Go to the original post, click edit, then use "go advanced" and then you can change the thread title
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  #19  
Old 11-07-2017, 06:54 PM
southernman southernman is offline
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Nice to see you got it worked out, I was surprised to see you having problems, as I know of 6 or meow CZ .17 hornets that will, shoot the 25g v-max.
both my CZ .17 hornets will shoot the 25v-max, but I don't bother, as they are for my .17 fireball, its get the call on bigger varmints, and long range work,
Good info for others, who may have problems.
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