Opinions on a new load please, ++ TRAJECTORY INFO

[pposey]

For all of you that know much more than me a simple request,,,,

I have a new load that is shooting lights out for me, sub moa out to 150 yards, shoots nice little clover leafs out at 80 yards, little recoil or blast, and a pleasure to shoot even with my shoulder. Now don't laugh, it's kinda slow for a pacnor 45 but I'm not really after speed as my ML shots are almost alwayyyyys under 75 yards. Here is the load,,,

31 grains IMR 4759, 200XTP, light blue harv. Winchester 209 shotshell primer.

I didn't think that there was a need for a 209M primer with 4759 in a .45

and figure that that low of a load should keep the 200XTP within it's performance range,,,, I have not even guessed at the speed, will make the trip to a friends house when/if I get a chance and use his chrony,,,,I'm thinking at least 2,000-2,100fps

anyone think this load would be temp sensitive to cold? To fast to use the XTP on deer? I have a bunch of 200sst's but the XTP is outshooting them big time

[wilmsmeyer]

Sounds great. Almost as is you had a .41 Mag on super steroids....yet a ML with a soft touch. Sounds ideal for bullet performance if your prediction on speed is right. Can you imagine a guy shooting that slug at 1700-1800 fps from a wheel gun? All the writers would be claiming how "devastating" that would be inside 100 yds.

What a pussycat that must be on the shoulder Posey. Bet you'll get all the penetration you need and perfect bullet performance.

Look forward to the hair testing.

[boarhog]

Pposey,
I suspect that 31 gr 4759 is quite a bit slower than your estimate. I chronographed a 250 gr XTP with 42 gr at 2050 fps several times. Mine was the plastic jug 4759.
Boarhog

[hunter]

Boarhog,
Was you tests in a 45 or 50 cal.
2050 sounds about right in a 50 cal. but would be different in a 45 in my opinion.

[edge]

Unfortunately Quickload does not have SR4759 in its library

It is a very bulky powder which generally reduces pressure and also velocity.
Using the bulk density of 4759, QL would place it somewhere in the 1850 +- fps range.

edge.

PS I forgot about pressure!

QL would put it around 23Kpsi @ 1850fps.
4759 is a Cowboy powder so ignition should not be a real problem and you are always very close to 100% case capacity anyway. As ET wrote if velocity drops off go to a hotter primer.

[ET]

Pposey

I agree with Wilmsmeyer’s assessment with the above-mentioned load.
Definitely no laughing here because like you I seek accuracy combined with bullet characteristic for a good humane killing load. Higher velocity for longer ranges is a secondary consideration for me.
The only true way to confirm if your load is Temp sensitive is trying it through different temp ranges. Should a decrease in velocity and accuracy start occurring around a given drop in temp range a simple change to a hotter primer may easily compensate.

With hunting there are many factors some consider luck but when the hunter knows his equipment and skill level the only role luck plays now is coming across some game.

Good Hunting this Fall Season


Ed

[rangeball]

What kind of drop are you getting at 150 yds?

[pposey]

I'm not sure of the 150 yard drop, I made scope changes between the two ranges,,,, will try some 150 yard shots with the current setting of 1 inch high at 80 this weekend when I can get to my uncles farm and shoot, probably out to 180. 80 yards is all I can get at my house anymore. Knowing that drop will alow me a geuss at speed,,,, have to make a trip to get to the Chony,,,,, I need to buy another myself,,,,

[pposey]

shot this group this afternoon only waiting 5 mins between shots, not sure which shot was which, forgot the spotting scope and was feeling lazy

cid-86f11e537cb9c8bf.photos.live.com/self.aspx/ML2/IMG%5E_0973.JPG

so lets say that means 3.5 inches low at 162 yards,,, and I am 1.25 inches high with one hole groups at 76 yards...

I know those are wierd ranges but those are the distances I have open to shoot right now, cattle were in the normal shooting lane at my uncles and had to make due,,,

now BC on the 200XTP is .199 acording to hornady,,,,,, that puts it just under 2100fps with that trajectory on point blank. I'm betting that BC is a little high though.....

[boarhog]

pposey,
No, I didn't realize you were talking about a 45. The 2050 I was talking about was in my 50 cal.
Sounds like I need to try the load myself. I'll weigh up a few vials and whizz them over the Oehler Chrono next weekend.
BH

[ET]

Pposey

Taking the info you have provided and running it into my Point Blank calculator until numbers more closely match, your velocity should be 2000fps and zero is 125yds.
At least that’s what I’m showing.

Hope this is helpful in some way to you.


Ed

[kudzu]

Sept 28, 2010 18:49:35 GMT -5 pposey said:

I know those are wierd ranges but those are the distances I have open to shoot right now, cattle were in the normal shooting lane at my uncles and had to make due,,,

you could have posted some bullet performance had you been a thinkin ;D ;D

[pposey]

No way I'm shooting one of the uncles cows,,,,,, depending on the BC I use I get from there up to 2080fps on mine as well.

[edge]

I suspect that the BC is way too high!
Do the guns that shoot that bullet generally shoot supersonic?

A bullet fired @ 1000 fps will have a much higher BC below the speed of sound.
Spitzer bullets behave differently than very blunt bullets like the XTP.

I suspect that if fired close to 2000 fps that the BC is closer to .130, but I can't prove it

I also can't disagree with your math on the drop table, but would love to see a third range drop to see if it falls on the same curve

edge.

[pposey]

what would be a good range to go for on that, I can do shorter than 160 but can't get any longer for a couple of weeks till the cattle are moved

[pposey]

and I agree on the BC I was thinking .140 max,,,, that would put my speed around 2100,,,, I gotta get another chrony! how about a 125 yard shot? could do a couple there and a couple at another range

after 160 yards that sucker starts dropping like a rock anyway

[pposey]

I'm either shooting at 2800 feet elivation at my house or 2200 feet at the uncles house as well, that changes but a little though