Interesting..........

Advertise with us
shop deals on amazon
L&R
Shop deals on ebay
Modern Muzzleloading Forum

Help Support Modern Muzzleloading Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
ENCORE50A

ENCORE50A

Long Range Shooter
Supporting member
*
Joined
Dec 4, 2009
Messages
7,492
Reaction score
8,128
Family for a few days and the BIL shot DUNAMIS today. First two rounds virtually in the same hole. He opened up a bit for the next 3, but he's not used to shooting often.

Then out came the chronograph to test the velocity of two identical weight bullets, both 275grs, with the identical WEIGHED charge of the same lot number of BH.

275gr Fury Star Tip2...….. averaged 2,350fps

275gr Accumax……………….. averaged 2,500fps

Accumax was a + 150fps
 
What are the claimed BC's of each bullet, and distance to the Chronograph?
 
Hollow point vs solid point. The solid point cuts thru the air with little resistance while the hollow point creates an well where air forced in creates a disturbance at the tip which slows it a little.
 
Pretty sure both are aluminum tipped bullets. Neither one is a hollow point. I think Fury uses a bit softer metals but not 100% sure.

Pittman claimed BC....Estimated Ballistic Coefficient .300 G1
Fury claimed BC.......BC 275gr. .280
 
I’d weigh the bullets to know for sure that they are identical weight. Were you using sub bases or wads? 150 FPS is too much difference to be a fluke. :wall:.
 
GM54-120 said:
Pretty sure both are aluminum tipped bullets. Neither one is a hollow point. I think Fury uses a bit softer metals but not 100% sure.

Pittman claimed BC....Estimated Ballistic Coefficient .300 G1
Fury claimed BC.......BC 275gr. .280
Click to expand...

Correct.

Distance from the chronograph was 15'
The Pittman has the .015" jacket.
Bullet weights dead on 275grs.
Veggie wad with both.

Fury:
275left 300right.jpg

Pittman Accumax:
IMG_1554.JPG
 
452-2.jpg

.452 CALIBER STAR TIP MZ 2
JACKET IS SOLDERED TO LEAD CORE
EXCELLENT WEIGHT RETENTIONS
275 GRAINS, 300 GRAIN
BC 300 GR. .295
BC 275. .280

https://www.furycustombullets.com/webapp/p/208/muzzle-loader



cache_901688101.jpeg
Pittman Bullets AccuMax .452" 250, 275, 300 and 325 Grain


AccuMax .452" 275 Grain


Features Include:

  • 275 Grain Weight
  • .452" Diameter
  • .021" Thick, Custom Made Copper Jackets
  • 1.205" Length
  • Solid Lead Cores
  • Precision Machined Aircraft Grade Aluminum Tips
  • Securely Packaged In Quantities Of 25, 50 or 100
  • Sectional Density .192
  • Estimated Ballistic Coefficient .300 G1

JFYI

I see Pittman is having a 4th of July sale today from 9AM -9PM.

"
***Pittman Bullets 4th of July, Independence Day Sale***



Sale starts 9:00 AM EST July 4th 2019

Sale ends 9:00 PM EST July 4th 2019



Pittman Bullets AccuMax .452"

$15.00 off per 100 count

$7.50 off per 50 count



Pittman Bullets Aeromax .452"

$20.00 off per 100 count

$10.00 off per 50 count



Pittman Bullets AccuMax .402"

$15.00 off per 100 count

$7.50 off per 50 count



Pittman Bullets Aeromax .402"

$20.00 off per 100 count

$10.00 off per 50 count



Sale price available for bullets currently in stock. Sale price is not to be combined with any other offers or discounts. Sale price does not apply to sales prior to July 4th 2019 or after July 4th 2019."

https://www.pittmanbullets.com/
 
Last edited:
herschel conyers said:
I’d weigh the bullets to know for sure that they are identical weight. Were you using sub bases or wads? 150 FPS is too much difference to be a fluke. :wall:.
Click to expand...

In my NULA, a certain load has nearly a 40fps gain just swapping from a MMP to a Harvester sabot. Jacket thickness and hardness could make a big difference in speed when shooting sabotless. BH209 creating somewhat low peak pressures should benefit from bullets that obturate easier.

The shorter bearing surface of the Pittman could also be a factor?
 
I forgot to give you my thouggts on possible causes, besides BC.

Bullet size, bearing surface, jacket thickness, core hardness, obturation at upset, different light angle at time of shooting through chronograph.

Just some possible contributors.
 
Busta said:
View attachment 4772

.452 CALIBER STAR TIP MZ 2
JACKET IS SOLDERED TO LEAD CORE
EXCELLENT WEIGHT RETENTIONS
275 GRAINS, 300 GRAIN
BC 300 GR. .295
BC 275. .280

https://www.furycustombullets.com/webapp/p/208/muzzle-loader



View attachment 4775
Pittman Bullets AccuMax .452" 250, 275, 300 and 325 Grain


AccuMax .452" 275 Grain


Features Include:

  • 275 Grain Weight
  • .452" Diameter
  • .021" Thick, Custom Made Copper Jackets
  • 1.205" Length
  • Solid Lead Cores
  • Precision Machined Aircraft Grade Aluminum Tips
  • Securely Packaged In Quantities Of 25, 50 or 100
  • Sectional Density .192
  • Estimated Ballistic Coefficient .300 G1

JFYI

I see Pittman is having a 4th of July sale today from 9AM -9PM.

"
***Pittman Bullets 4th of July, Independence Day Sale***



Sale starts 9:00 AM EST July 4th 2019

Sale ends 9:00 PM EST July 4th 2019



Pittman Bullets AccuMax .452"

$15.00 off per 100 count

$7.50 off per 50 count



Pittman Bullets Aeromax .452"

$20.00 off per 100 count

$10.00 off per 50 count



Pittman Bullets AccuMax .402"

$15.00 off per 100 count

$7.50 off per 50 count



Pittman Bullets Aeromax .402"

$20.00 off per 100 count

$10.00 off per 50 count



Sale price available for bullets currently in stock. Sale price is not to be combined with any other offers or discounts. Sale price does not apply to sales prior to July 4th 2019 or after July 4th 2019."

https://www.pittmanbullets.com/
Click to expand...

The Pittman Accumax bullets I'm shooting have the .015" jacket. Doug helped me out with these.

IMG_1553.JPG I got them from Doug.
 
George if you use the same die setting with both bullets your Fury’s will be considerably looser . That may be the reason the Fury s are slower .

I have found if I clean between shots with a snug bullet fit I will gain aprox 75 FPS vs shooting a looser bullet fit and dirty . Accuracy is about the same .
 
Dougs136Schwartz said:
George if you use the same die setting with both bullets your Fury’s will be considerably looser . That may be the reason the Fury s are slower .

I have found if I clean between shots with a snug bullet fit I will gain aprox 75 FPS vs shooting a looser bullet fit and dirty . Accuracy is about the same .
Click to expand...

I was also going to ask if they felt the same going down but couldn't have told you specifically what the difference would have been. My only other thought would be that the longer bearing surface would be slower to push out. I wouldn't have guessed that much slower though. Coupled with a looser fitting bullet though and that might be enough to make the difference?
 
Dougs136Schwartz said:
George if you use the same die setting with both bullets your Fury’s will be considerably looser . That may be the reason the Fury s are slower .

I have found if I clean between shots with a snug bullet fit I will gain aprox 75 FPS vs shooting a looser bullet fit and dirty . Accuracy is about the same .
Click to expand...
Yup.
There's a 4 mark difference sizing the two bullets. The Pittman requires 4 more clicks smaller on the die to maintain 20# of loading force. The Fury at 4 clicks larger than the Pittman load at the 20# force. As you already know, I use a precision force gauge for measurements.

Both were shot using the identical charge weight of BH and same veggie wad. Loading forces were identical at 20#.
 
SuperKirby said:
I was also going to ask if they felt the same going down but couldn't have told you specifically what the difference would have been. My only other thought would be that the longer bearing surface would be slower to push out. I wouldn't have guessed that much slower though. Coupled with a looser fitting bullet though and that might be enough to make the difference?
Click to expand...

My thought on the short bearing surface is its easier to obturate. Less material to expand into the grooves but at the same time less surface area riding against the bore. You might see less of a difference when comparing them in a SML application because peak pressures are so much higher than BH209. Even with heavy loads of BH209 its hard to make much over 30kpsi with bullets upto 300gr. You really got to use lots of it to get that high too. SML loads in a similar speed range are easily making 10kpsi more pressure than BH209. Roughly around 38-44kpsi with some of the commonly used powders.
 

Similar threads

ENCORE50A
BH209 Lot to lot velocity test
2
Replies
25
Views
2K
45-70
4
M
Fast twist 50 cal a 400 Bullet review
2
Replies
33
Views
898
Ninering62
Ninering62
W
Range Report 3.0: .50 Renegade with Sized Hornady Great Plains Bullets
2
Replies
22
Views
1K
trickyricky
trickyricky
MrTom
I've been studying.....
Replies
6
Views
704
LBAhunter
L
ENCORE50A
CONTROLLED TESTING FINISHED
Replies
10
Views
2K
SuperKirby
SuperKirby

Latest posts

Back
Top