another new IMR 4198 LOAD for 5.56 chambered rifles

[heymarine1833]

hi guys. sorry. no pictures today. tried new load again with imr 4198 but this time with a 63 grainer. even wore heavy safety glasses for this one lol! a lot of riflemen have said that this powder is awful for 55 grains and up so im testing to see how awful it really is. just think. im saving you a lot of time. groups were not real good but not bad either. groups were a failure on the shooters part. load shows promise. as soon as more time with this load is done, i'll post more info in case you want to try this load in your 5.56mm CHAMBERED RIFLE

AS PER SUGGESTION BELOW:

CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.

ok. here goes.
temperature = 30*
wind = north @ 12mph with gusts to 16mph guesstimate
rifle = COLT LE 6920 CHAMBERED IN 5.56 NATO WITH 16" BARREL
SCOPE=VORTEX VIPER HS 4-16X50(OVERKILL BUT ON SALE!)
POWDER= IMR 4198
WEIGHT = 21.6
BULLET = 63 SIERRA SP#1370
PRIMER=REMINGTON BR 7.5
CASES= LAKE CITY/TRIMMED TO 1.745/COAL:2.260
PRESSURE MAX=62336 PSI
LOAD PRESSURE= 53087
BULLET AND BORE COATED WITH HEX BORON NITRIDE
-----------------------------------------
HI=2783
LO=2704
AV=2730
ES=79
SD=24
NOTES: GOOD DATA GOOD LOAD. WILL WORK WITH THIS MORE WHEN TEMP GETS A BIT MORE COMFORTABLE

hope you guys don't give me hell about this one too because i will never post another load again and it will be up to you to do all the leg work

 

[J_McLeod]

Thanks for sharing. I've been experimenting with H4198, which I've also heard is awful for 5.56 55+ and ARs. The LGS had it in stock, so I'll have some fun with it.

 

[bluetopper]

I've deformed more than a few necks on 223 brass trying to cut the long hard granules of 4198 with my powder dispenser, never will I buy it again.

 

[heymarine1833]

using a dillon powder measure. thing doesnt like imr 4064, imr 4320 or now, the new H-4895. sorry it didnt work with your equipment but it sure is a good powder so far in 55 speer tnt, 60 sierra hp and now the 63 grain sierra sp bullet. i would be reducing the charge by at least .3 -.5 grain IF you are not using a friction reducing compound like moly, danzac or hbn as im afraid the pressure would be scary