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Pressure build near max for ball powders
- Thread starter Tac-O
- Start date
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Mike Matteson
Well-Known Member
I didn't think it every got above 70F in Canada.
SSgt G Cody
Well-Known Member
I have found sudden pressure spikes mostly when bullet is pushed into the lands. Avoid this on hot loads! Keep loads at least .030" Out of lands, and stay much safer; little or no accuracy will be lost in doing this, according to my research.
This or maybe a tad less for safety measures! Those velocities are no slouch. My apologies; I do not remember if this has the +P throating.
Hugnot
Well-Known Member
Nice graph! - my compliments
I use R-S Hunter & Staball for many of my rifles because it is available.
My best results are with large rifle primers & crimping. In cold temperatures I use magnum primers. A good .22-.250 combo is 36.5 gr Staball, 75 H ELDM or 75 H hpbt, PPU brass, & Fed 215 primers. Crimped, 7.7 twist.
Another is 6.5 CM, 47.0 R-S Hunter, 120 H ELDM, Win bass, Fiocchi LRP's.
I avoid compressed ball powder loads. Best results appear to be with 90% plus charges.
An experiment using CCI41's in the 6.5CM with R-S Hunter showed erratic ignition, huge velocity spreads - at 80 plus deg. F.
.22-.250 loads using 35.0 gr. of H414, CCI 200 & 75 AMax bullets were OK at 65 deg. but showed heavy bolt lifts at 95 degr.
Some stats:
Only 5 rounds were fired, not significant, but showed some trends. When it gets warmer more loads using Staball & Fed 215' will be tested. Fed 215's gave better results than Fiocchi LRP.
This load -6.5 CM, 130 HELDM, Fiocchi LRP, Win Brass. Temps. at 70F
I use R-S Hunter & Staball for many of my rifles because it is available.
My best results are with large rifle primers & crimping. In cold temperatures I use magnum primers. A good .22-.250 combo is 36.5 gr Staball, 75 H ELDM or 75 H hpbt, PPU brass, & Fed 215 primers. Crimped, 7.7 twist.
Another is 6.5 CM, 47.0 R-S Hunter, 120 H ELDM, Win bass, Fiocchi LRP's.
I avoid compressed ball powder loads. Best results appear to be with 90% plus charges.
An experiment using CCI41's in the 6.5CM with R-S Hunter showed erratic ignition, huge velocity spreads - at 80 plus deg. F.
.22-.250 loads using 35.0 gr. of H414, CCI 200 & 75 AMax bullets were OK at 65 deg. but showed heavy bolt lifts at 95 degr.
Some stats:
Only 5 rounds were fired, not significant, but showed some trends. When it gets warmer more loads using Staball & Fed 215' will be tested. Fed 215's gave better results than Fiocchi LRP.
This load -6.5 CM, 130 HELDM, Fiocchi LRP, Win Brass. Temps. at 70F
It doesnt. Standard throat and kinda fairly short. I'll likely rent a unithroater and extend the throat s bit for 200s and it should also reduce pressure a but on these loads and my 185 loads with a good case fill.
I think you're right I should probably do a bit less than the lower charge I stated for both powders. Maybe 57 for SB and 58.5 for hunter.
Thanks for sharing!
Gary in MD
Well-Known Member
TAC works very well in my 223AI
StaBall6.5 working awesome in one of my 30-06s and pretty good in a 8 twist 22-250
Hunter is working very well in my 220 Swift
Sometimes you have to play around a little with the ball powders to get them to perform, including trying different primers.
I wouldn't shoot a maximum load in the hot summer that had been worked up in the cooler temperatures.
StaBall6.5 working awesome in one of my 30-06s and pretty good in a 8 twist 22-250
Hunter is working very well in my 220 Swift
Sometimes you have to play around a little with the ball powders to get them to perform, including trying different primers.
I wouldn't shoot a maximum load in the hot summer that had been worked up in the cooler temperatures.
Mike Matteson
Well-Known Member
What your twist rate in your 220 swift? If you don't mind.
Gary in MD
Well-Known Member
Twist is 12" & 26" barrel
The load that I'm using Hunter in is with the 55 grain Sierra Blitz Kings. I ran it over the chrono at 3860 fps.
The load that I'm using Hunter in is with the 55 grain Sierra Blitz Kings. I ran it over the chrono at 3860 fps.
mrultramag
Well-Known Member
Where do you "rent" a uni-throater?
Mike Matteson
Well-Known Member
If I remember corretly mind is 1-14 twist rate. It's in a 24" bull barrel. I have use Sierra 55 gr for a very long time. I was at 3900fps using IMR4064 using 38.1grs. I could at one time shot almost a bug hole with that load. 38.1 grs, in my old Sierra reloading manual. The rifle is in a Mauser 98 action. I haven't used in a few years. I am looking at putting in back to action.
My plate is load presently.
mrultramag
Well-Known Member
Cool thankyou
