.45ACP Match Ball
+10
Dr.Don
Jerry Keefer
Blsi2600
Ed Hall
DeweyHales
gptuners
SteveT
KevinB
BE Mike
Richard Ashmore
14 posters
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.45ACP Match Ball
For those wishing to duplicate the performance of .45ACP Match Ball, here are the relevant detail-
Velocity- the average velocity of the sampled cartridges, conditioned at 70F (+/-2), shall be 855 feet per second (+/- 25 fps) at 25.5 feet from the muzzle. The standard deviation of the velocities shall not exceed 27 feet per second.
The average fifty (50) yard group size (nine ten-shot groups are fired) shall not exceed 3 inches.
I have a pdf copy of the Mil Spec but it's too large to attach.
Velocity- the average velocity of the sampled cartridges, conditioned at 70F (+/-2), shall be 855 feet per second (+/- 25 fps) at 25.5 feet from the muzzle. The standard deviation of the velocities shall not exceed 27 feet per second.
The average fifty (50) yard group size (nine ten-shot groups are fired) shall not exceed 3 inches.
I have a pdf copy of the Mil Spec but it's too large to attach.
Richard Ashmore- Posts : 156
Join date : 2012-02-17
Re: .45ACP Match Ball
I've always heard that the bullet choice was the real difference. Is the Sierra still on top?
BE Mike- Posts : 2587
Join date : 2011-07-29
Location : Indiana
Re: .45ACP Match Ball
Is there ever a reason to shoot 230 gr ball any more?
KevinB- Posts : 116
Join date : 2015-02-16
Re: .45ACP Match Ball
My service pistol won't feed JHP, and it will shoot 230FMJ into about 3". Eventually I'll probably adjust it to shoot JHP, but I'm hesitant to change it when it works so well. Besides, real 230 FMJ hardball is cool.
Yes Sierra 8815 is a great bullet. Zeros are essentially the same. I've heard IMI makes a good FMJ bullet but have never tried it.
Yes Sierra 8815 is a great bullet. Zeros are essentially the same. I've heard IMI makes a good FMJ bullet but have never tried it.
Re: .45ACP Match Ball
Noob here... why wouldn't you?KevinB wrote:Is there ever a reason to shoot 230 gr ball any more?
gptuners- Posts : 51
Join date : 2014-08-10
Re: .45ACP Match Ball
Prior to this year service pistol matches requires 230gr FMJ bullets.
Starting in 2015 the CMP expanded the legal bullets to include FMJ and JHP and removed the weight requirement. Good JHP are almost always more accurate than FMJ and 185gr produce less recoil, so 185gr JHP should be both more accurate and easier to shoot.
Starting in 2015 the CMP expanded the legal bullets to include FMJ and JHP and removed the weight requirement. Good JHP are almost always more accurate than FMJ and 185gr produce less recoil, so 185gr JHP should be both more accurate and easier to shoot.
Re: .45ACP Match Ball
I realized the rule change, but didn't know that JHP are more accurate. I always thought of JHP as defense ammo, not necessarily match ammo.SteveT wrote:Good JHP are almost always more accurate than FMJ and 185gr produce less recoil, so 185gr JHP should be both more accurate and easier to shoot.
It doesn't help that all the 185gr I've shot is +P or ++P.
gptuners- Posts : 51
Join date : 2014-08-10
Re: .45ACP Match Ball
I don't know all the reasons why, but...
JHP has the center of mass further back than solid round nose
JHP has a higher moment of inertia relative to the mass since the center is hollow the mass is further out.
When Forming FMJ the jacket is applied and swaged in place from the tip of the bullet and wraps around the bottom, requiring another step to form the base, and another opportunity to introduce slight inconsistency. The jacket of a JHP is applied and formed from the base of the bullet and wraps around into the hollow point. The base and sides of the bullet are swaged in one step and one die, so they edges of the base should be perfect.
I don't know if any of these really are the reason why they are more accurate and I am sure there are other reasons I don't know about.
JHP has the center of mass further back than solid round nose
JHP has a higher moment of inertia relative to the mass since the center is hollow the mass is further out.
When Forming FMJ the jacket is applied and swaged in place from the tip of the bullet and wraps around the bottom, requiring another step to form the base, and another opportunity to introduce slight inconsistency. The jacket of a JHP is applied and formed from the base of the bullet and wraps around into the hollow point. The base and sides of the bullet are swaged in one step and one die, so they edges of the base should be perfect.
I don't know if any of these really are the reason why they are more accurate and I am sure there are other reasons I don't know about.
Re: .45ACP Match Ball
In my guns, 230s really shot poorly. I felt that the 230s really held me back. I tested Sierras, Zeros, Winchesters, Magtechs, Montana Golds, and Precision Deltas. 185s are outstanding in my gun. I now use Noslers or Zeros with 4.6 of N310.
DeweyHales- Posts : 641
Join date : 2011-06-10
Location : North Carolina
Re: .45ACP Match Ball
I have added the specifications document from Richard Ashmore, that he referenced in the first post of this thread, to my home page. The title and link are:
Military Specifications for Match Grade .45 Ball (.pdf)
Thanks Richard!
Military Specifications for Match Grade .45 Ball (.pdf)
Thanks Richard!
Re: .45ACP Match Ball
There seems to be a difference in the velocity in the "3.4 Velocity ... 855 FPS"
in the MIL-C-46482B(MU) and the 820 FPS marked on every box of white box match ball that I have observed in the last 40+ years. Could there be another revision to the spec after 46482B?
in the MIL-C-46482B(MU) and the 820 FPS marked on every box of white box match ball that I have observed in the last 40+ years. Could there be another revision to the spec after 46482B?
Blsi2600- Posts : 158
Join date : 2013-03-27
Location : SW ILLINOIS
Re: .45ACP Match Ball
I have some 1972 white box... it all says 820..
Also have some Brown box, but no velocity noted on the box..
Also have some Brown box, but no velocity noted on the box..
Jerry Keefer- Posts : 1001
Join date : 2012-01-02
Location : Maidens, VA
Re: .45ACP Match Ball
I chronographed some WCC 85 Match ball at 865 fps within the last year. I never believed any of it was really as low as 820.
Dr.Don- Posts : 816
Join date : 2012-10-31
Location : Cedar Park, TX
Re: .45ACP Match Ball
I have some red box 45A from the 70s ? match ball that chronographs right at 820.
And this:
Also I have blown up a picture of very very early brown box. Printed on it is definitely velocity 820.
I loaded my ball with either Titegroup 4.8 or N320 5.2, both 820ish and very good ammo
Recent 45A and AE45A chrono near 870. Why? I donno.
And this:
Also I have blown up a picture of very very early brown box. Printed on it is definitely velocity 820.
I loaded my ball with either Titegroup 4.8 or N320 5.2, both 820ish and very good ammo
Recent 45A and AE45A chrono near 870. Why? I donno.
Jack H- Posts : 2699
Join date : 2011-06-10
Age : 75
Location : Oregon
Re: .45ACP Match Ball
Maybe a change in chronograph technology?
james r chapman- Admin
- Posts : 6372
Join date : 2012-01-31
Age : 75
Location : HELL, Michigan
Re: .45ACP Match Ball
The early chronographs used break wire screens and they were blacked at some distance apart. The early ammo velocities reflected that. I do know that 30-06 had velocities sfpecified at 78 feet because the screens were placed at 3 feet and 153 feet for rifle ammo.
Wobbley- Admin
- Posts : 4805
Join date : 2015-02-12
Re: .45ACP Match Ball
I believe the factories now use induction rather than optical chronograph now.
I'd suggest chrono'ing a few factory thru your setup and just match what you record.
I'd suggest chrono'ing a few factory thru your setup and just match what you record.
james r chapman- Admin
- Posts : 6372
Join date : 2012-01-31
Age : 75
Location : HELL, Michigan
Re: .45ACP Match Ball
Folks, JBM Ballistics using the default mostly "standard" conditions has the Sierry 230-gr Tournament Master at 855 fps at 25.5 feet from the muzzle motoring along at:
muzzle: 860.4
10 yards: 854
20 yards: 847.8
30 yards: 841.6
The old 78 feet measurement point is closer to 30 than 20 yards, so if the posted specs are the now-current values, I would venture to guess that the specs changed by about 23 fps. All of that *could* be accounted for by the longer deceleration time for the bullet under the old military measurement equipment...making them look just a little bit slower. I would expect that effect to be greater with lower-BC bullets.
muzzle: 860.4
10 yards: 854
20 yards: 847.8
30 yards: 841.6
The old 78 feet measurement point is closer to 30 than 20 yards, so if the posted specs are the now-current values, I would venture to guess that the specs changed by about 23 fps. All of that *could* be accounted for by the longer deceleration time for the bullet under the old military measurement equipment...making them look just a little bit slower. I would expect that effect to be greater with lower-BC bullets.
GrumpyOldMan- Posts : 482
Join date : 2013-03-08
Location : High Desert Southwest Red Rock Country
Re: .45ACP Match Ball
To add to above post, I chronoed with the same setup both the old 45A and New 45A at about 8-10 feet out with a sky screen unit.
Old 45A goes 820. New 45A goes about 860-870.
Old 45A goes 820. New 45A goes about 860-870.
Jack H- Posts : 2699
Join date : 2011-06-10
Age : 75
Location : Oregon
Re: .45ACP Match Ball
Blsi2600 wrote:There seems to be a difference in the velocity in the "3.4 Velocity ... 855 FPS"
in the MIL-C-46482B(MU) and the 820 FPS marked on every box of white box match ball that I have observed in the last 40+ years. Could there be another revision to the spec after 46482B?
Someone years ago posted on the old Bullseye List that the manufacturers couldn't meet the accuracy requirements at 855fps, so they were granted an exception for match ammo allowing 820fps. I didn't keep the old email so I don't know if there was any documentation or if it was just hearsay, but it's not too hard to believe.
Re: .45ACP Match Ball
IF it were going that fast at the *correct* distance, your old 45A is only 10 fps slower than the minimum in the specs' tolerance.Jack H wrote:To add to above post, I chronoed with the same setup both the old 45A and New 45A at about 8-10 feet out with a sky screen unit.
Old 45A goes 820. New 45A goes about 860-870.
Even allowing for smokeless tends to shoot slower the older it gets (usually...), this makes me believe that the new stuff is indeed faster, and consistently so.
GrumpyOldMan- Posts : 482
Join date : 2013-03-08
Location : High Desert Southwest Red Rock Country
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