JFP vs JHP 44 magnum

[MovedWest]

I have a bunch of load data I've worked up over the years for JHP's in 44 mag. Readying up to reload I realize I'm only stocked with 240gr JFP's and am out of 240gr JHP's. I have them on backorder from Midway, but I think you all know that story. Since I only have a limited number of bullets I'd rather not expend them on working up a new load if I can avoid it. My recipe for my JHP's is:

(Warning: This load is near maximum pressure. Do not reload without testing it personally.)
240gr Remington JHP
21.0gr 2400
CCI350 LPM primer
OAL=1.600"
Velocity= ~1417fps

Would you modify this load to compensate for the JFP vs the normal JHP? Or would you just let it ride as is?

-MW

 

[rcmodel]

Well, a JFP should be shorter, and have less bearing surface then a like weight JHP.

The shorter bullet will increase case capacity at the same OAL seating length and slightly reduce pressure.

Less bearing surface will reduce pressure slightly too, if bullet construction is equal.

On the otherhand, you are already at a max load or slightly over according to both Lyman and Alliant data.

Might want to back off just a scooch at least and try the new bullets before going hog-wild on it.

rc

 

[buck460XVR]

Like RC stated, cause you're already at max and you're changing a major component, you should lighten up a bit just to make sure.

I load both bulk Nosler 240 grn. JSPs and JHPs. Altho the JSPs are a tad shorter overall, the cannelure is the same distance from the base on both bullets, thus the OAL is a tad different. I load them both with the same charge and they impact the target so similarly that at 50 yards I can't tell the difference. Next time out I'm gonna chrono them to see how much difference there really is.

 

[MovedWest]

Thanks for the sagely advice. I will consider this warning heeded. Better safe than sorry, especially with these rounds. I'll step this back to about 19.5gr of 2400 and work it up over the course of about 50 rounds.

I know different bullets print differently, but do you guys think there would be much of a difference in the accuracy? Both the JHP's and JFP's are 240gr Remingtons. I know it would be speculation, but I'm curious to your opinions based on your experience.

Thanks as always!

-MW

 

[MovedWest]

buck460XVR - Thanks for the info. If you chrono them please try to remember this thread and let me know. Even if I'm past testing and reloading my rounds I'd still be curious to know.

-MW

 

[rcmodel]

I doubt you will see much differance in accuracy, although POI may change slightly.

Remington isn't in the business of making bullets that don't meet or exceed industry accuracy standards.

It could be your specific gun doesn't like one as well as the other, but I doubt it.

rc

 

[Asherdan]

I use the same charge of 2400 with both Hornday 240g XTP's and the MagTech 240g JSP. The Magtech is 100 fps slower, it's .429 and the XTP is .430 so part of the reason may be bore seal. Accuracy is excellent with both but they print 4" horizontally off of each other at 50 yards.

When I started with the MagTech as a range plinker I'd already worked up the XTP to a velocity/accuracy combo I was real happy with so I backed off to 19g and worked right back up. Turns out my top charge of 20.5 is most accurate with both bullets. Hope the OP is just as lucky on that front.