chronograph data

[rporter]

for the last few days I have been testing loads and getting ready to hunt.

a new bullet for the 45-70 was tried in the encore ML - just because.

50 cal orange sabot for a 250 monoflex in .258 dia pushed by 72 gr. by weight of blackhorn.

a sample of the data put out with each shot [ this was the slowest shot of the string]
muzzle vel.1916fps
20 yd 1844
40 yd 1773
60 yd 1704
80 yd 1635
100yd 1573

the average for 7 shots was 1958 fps at the muzzle and 1607 fps at 100 yd. for the 250 mono in the orange sabot.
it had 2.5 inches vertical.

last years load of 72 gr by weight of blackhorn and a 300 gr xtp mag bullet in a black crush rib sabot shot mostly flat with one pop up flier that made it a 2 inch group, but right on target.

muzzle vel. averaged 1871 fps and the 100 yd vel averaged 1534fps for 6 shots.

the 250 mono group was 4.5 in higher than the 300 xtp group.

if you find a use for this fine, if not that's ok, too.
luck-ray

 

[HC]

Thanks for sharing the data.


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[BuckDoeHunter]

Good info. I bought two boxes of the .458 250gr Monoflex for my 45-70. I’m also going to try them in the .50 cal muzzleloader with a crushrib sabot and see how they do.

 

[Lee 9]

Dose anyone recognize that style of writing?

 

[BuckDoeHunter]

Dose anyone recognize that style of writing?

What do you mean?

 

[HC]

Dose anyone recognize that style of writing?

No. Go ahead and enlighten us.


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[rporter]

our Arkansas ML season was this week. I really wanted to test the 250 mono but
the 300 gr xtp got the call
it was 5.1 miles from the road to pack this one. [never seen another hunter]

ps
for the guy wondering who I am ---- that's me on the right!

 

[Muley Hunter]

What state?

 

[MrTom]

What state?

"our Arkansas ML season was this week".....

 

[samwilliamson]

Re: RE: chronograph data

for the last few days I have been testing loads and getting ready to hunt.

a new bullet for the 45-70 was tried in the encore ML - just because.

50 cal orange sabot for a 250 monoflex in .258 dia pushed by 72 gr. by weight of blackhorn.

a sample of the data put out with each shot [ this was the slowest shot of the string]
muzzle vel.1916fps
20 yd 1844
40 yd 1773
60 yd 1704
80 yd 1635
100yd 1573

the average for 7 shots was 1958 fps at the muzzle and 1607 fps at 100 yd. for the 250 mono in the orange sabot.
it had 2.5 inches vertical.

last years load of 72 gr by weight of blackhorn and a 300 gr xtp mag bullet in a black crush rib sabot shot mostly flat with one pop up flier that made it a 2 inch group, but right on target.

muzzle vel. averaged 1871 fps and the 100 yd vel averaged 1534fps for 6 shots.

the 250 mono group was 4.5 in higher than the 300 xtp group.

if you find a use for this fine, if not that's ok, too.
luck-ray

Thanks that is super helpful to me. I was getting ready to try a very similar load in my Accura PR. 74grW bh209. Just ordered. the orange sabots and dont have a chronograph yet.

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[rporter]

after sighting in and collecting some data I was punching the numbers into the hornady ballistics calculator.
on occasion some interesting and odd things show when you can get velocity at 20 yd intervals. I have seen two bullets start out as the same velocity and get to 100y and one will be slower.

also seen a bullet start 20 fps faster at the muzzle and get to 100 and be 20 fps slower that a bullet that was started 20 fps slower at the muzzle.

the 250 mono was claimed to have a BC of .17X
by using that for a BC the numbers did not add up.

by starting at 1958 fps the 100 yd velocity was supposed to be 1559 fps and the chronograph got 1607 fps at 100yd.

if I changed the BC in the program to .201 the numbers were very close to correct [ well at least close to mine]
correct is relative. I could make the numbers match.

I got the same result shooting the 250 mono in a marlin 1895.

the 300 gr hornady xtp mag was right on their numbers.[ BC.200 ]

I also compared a .458 hornady 300gr HP in the marlin and my numbers were smack on their numbers.[.BC.197]

some day I will punch holes at 200 and try to verify this.

can anyone else duplicate the numbers, especially on a target.